Montmorillonite
A valid IMA mineral species - grandfathered
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About Montmorillonite
Formula:
(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Colour:
White, buff, yellow, green, rarely pale pink to red
Lustre:
Dull, Earthy
Hardness:
1 - 2
Specific Gravity:
2 - 3
Crystal System:
Monoclinic
Member of:
Name:
For the type locality at Montmorillon, Vienne, Poitou-Charentes, France.
Type Locality:
Montmorillonite-Vermiculite Group; Beidellite-Montmorillonite Series.
A common clay mineral. Compare 'UM1979-21-SiO:AlHNaV'.
As halloysite, it may be a biomineral formed by the action of lichens (e.g., Lasallia spp., Parmelia spp., etc.) on cave deposits and on waters (see Burford et al., 2003).
A common clay mineral. Compare 'UM1979-21-SiO:AlHNaV'.
As halloysite, it may be a biomineral formed by the action of lichens (e.g., Lasallia spp., Parmelia spp., etc.) on cave deposits and on waters (see Burford et al., 2003).
Unique Identifiers
Mindat ID:
2821
Long-form identifier:
mindat:1:1:2821:5
IMA Classification of Montmorillonite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2·nH2O
Classification of Montmorillonite
9.EC.40
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
71.3.1a.2
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
3 : Sheets of 6-membered rings with 2:1 clays
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
3 : Sheets of 6-membered rings with 2:1 clays
16.7.9
16 : Silicates Containing Aluminum and other Metals
7 : Aluminosilicates of Mg
16 : Silicates Containing Aluminum and other Metals
7 : Aluminosilicates of Mg
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Mnt | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Mnt | Kretz (1983) | Kretz, R. (1983) Symbols of rock-forming minerals. American Mineralogist, 68, 277–279. |
| Mnt | Siivolam & Schmid (2007) | Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download |
| Mnt | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371 |
| Mnt | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
| Mnt | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Pronunciation of Montmorillonite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Montmorillonite
Dull, Earthy
Transparency:
Translucent
Comment:
Low luster because of fine-grained nature of the mineral
Colour:
White, buff, yellow, green, rarely pale pink to red
Comment:
Pink to red coloration is due to high valance Mn
Streak:
White
Hardness:
1 - 2 on Mohs scale
Comment:
Soft because of fine-grained occurrence
Cleavage:
Perfect
on {001}
on {001}
Fracture:
Irregular/Uneven
Density:
2 - 3 g/cm3 (Measured)
Optical Data of Montmorillonite
Type:
Biaxial (-)
RI values:
nα = 1.485 - 1.535 nβ = 1.504 - 1.550 nγ = 1.505 - 1.550
2V:
Measured: 5° to 30°
Birefringence:
0.02
Max. Birefringence:
δ = 0.015 - 0.020
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Low (negative)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
none
Pleochroism:
Visible
Comments:
X= colorless to pale brown, yellow green
Y= dark brown to yellow-green, olive-green, pale yellow
Z= brown to olive-green, pale yellow
Y= dark brown to yellow-green, olive-green, pale yellow
Z= brown to olive-green, pale yellow
Comments:
Usually not pleochroic; pleochroism dependent on chemical substitution
Chemistry of Montmorillonite
Mindat Formula:
(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Element Weights:
Common Impurities:
Fe,K
Crystallography of Montmorillonite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 5.17 Å, b = 8.94 Å, c = 9.95 Å
β = 99.54°
β = 99.54°
Ratio:
a:b:c = 0.578 : 1 : 1.113
Unit Cell V:
453.53 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Scaly crystals, clayey, compact, massive
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0009129 | Montmorillonite | Gournis D, Lappas A, Karakassides M A, Tobbens D, Moukarika A (2008) A neutron diffraction study of alkali cation migration in montmorillonites Physics and Chemistry of Minerals 35 49-58 | 2008 | 0 | 293 | ||
| 0009128 | Montmorillonite | Gournis D, Lappas A, Karakassides M A, Tobbens D, Moukarika A (2008) A neutron diffraction study of alkali cation migration in montmorillonites Physics and Chemistry of Minerals 35 49-58 | 2008 | 0 | 293 | ||
| 0009127 | Montmorillonite | Gournis D, Lappas A, Karakassides M A, Tobbens D, Moukarika A (2008) A neutron diffraction study of alkali cation migration in montmorillonites Physics and Chemistry of Minerals 35 49-58 | 2008 | 0 | 293 | ||
| 0009126 | Montmorillonite | Gournis D, Lappas A, Karakassides M A, Tobbens D, Moukarika A (2008) A neutron diffraction study of alkali cation migration in montmorillonites Physics and Chemistry of Minerals 35 49-58 | 2008 | 0 | 293 | ||
| 0002868 | Montmorillonite | Viani A, Gualtieri A, Artioli G (2002) The nature of disorder in montmorillonite by simulation of X-ray powder patterns American Mineralogist 87 966-975 | ![]() | 2002 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 15.0 Å | (100) |
| 5.01 Å | (60) |
| 4.50 Å | (80) |
| 3.77 Å | (20) |
| 3.02 Å | (60) |
| 1.70 Å | (30) |
| 1.50 Å | (50) |
| 1.49 Å | (50) |
Comments:
Basal spacings sensitive to interlayer hydration. Dehydrated montmorillonite may have a 13.6 Angstrom spacing.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 2: Planetesimal differentiation and alteration | 4.566-4.550 |
| 6 : Secondary asteroid phases | 4.566-4.560 |
| Stage 3b: Earth’s earliest hydrosphere | >4.45 |
| 16 : Low-𝑇 aqueous alteration of Hadean subaerial lithologies (see also #23) | |
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Geological Setting:
Alteration product of volcanic tuffs and ash. Late-hydrothermal formation in various rocks.
Type Occurrence of Montmorillonite
General Appearance of Type Material:
Compact earthy massive mineral.
Synonyms of Montmorillonite
Other Language Names for Montmorillonite
Catalan:Montmorillonita
Dutch:Montmorilloniet
Esperanto:Montmorijonito
French:Montmorillonite
Hebrew:מונטמורילוניט
Hungarian:Montmorillonit
Italian:Montmorillonite
Japanese:モンモリロン石
Polish:Montmorillonit
Portuguese:Montmorillonita
Russian:Монтмориллонит
Simplified Chinese:蒙脱石
Slovak:Montmorillonit
Spanish:Montmorillonita
Traditional Chinese:蒙脫石
Ukrainian:Монтморилоніт
Varieties of Montmorillonite
| Alumodeweylite | An intermediate between montmorillonite and sepiolite. |
| Askanite | A variety of Montmorillonite - a decomposition product of volcanic ash. Originally described from Askana, Ozurgety District, Georgia. |
| Calcium-Montmorillonite | A calcian montmorillonite |
| Delanovite | A manganiferous variety of Montmorillonite. Originally reported from Dordogne, Aquitaine, France. |
| Ferrimontmorillonite | An Fe-bearing variety of montmorillonite. |
Relationship of Montmorillonite to other Species
Member of:
Other Members of Smectite Group:
| Beidellite | (Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O | Mon. 2/m : B2/m |
| Ferrosaponite | Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O | Mon. |
| Hectorite | Na0.3(Mg,Li)3(Si4O10)(F,OH)2 | Mon. 2/m : B2/m |
| Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O | Mon. 2/m : B2/m |
| 'Pimelite' | Ni3Si4O10(OH)2 · 4H2O | Hex. |
| Saliotite | (Li,Na)Al3(AlSi3O10)(OH)5 | Mon. 2/m : B2/m |
| Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O | Mon. |
| Sauconite | Na0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O | Mon. |
| Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 | Mon. |
| Swinefordite | Li(Al,Li,Mg)3((Si,Al)4O10)2(OH,F)4 · nH2O | Mon. 2/m : B2/m |
| Volkonskoite | Ca0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2O | Mon. |
| Yakhontovite | (Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2O | Mon. |
| Zincsilite | Zn3Si4O10(OH)2 · 4H2O (?) | Mon. |
Forms a series with:
Common Associates
Associations Based on Photo Data:
| 90 photos of Montmorillonite associated with Quartz | SiO2 |
| 51 photos of Montmorillonite associated with Phillipsite Subgroup | (Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O |
| 37 photos of Montmorillonite associated with Offretite | KCaMg(Si13Al5)O36 · 15H2O |
| 29 photos of Montmorillonite associated with Chabazite | |
| 21 photos of Montmorillonite associated with Calcite | CaCO3 |
| 14 photos of Montmorillonite associated with 'Cleavelandite' | Na(AlSi3O8) |
| 13 photos of Montmorillonite associated with Natrolite | Na2Al2Si3O10 · 2H2O |
| 12 photos of Montmorillonite associated with Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 11 photos of Montmorillonite associated with Lepidolite | |
| 11 photos of Montmorillonite associated with Siderite | FeCO3 |
Related Minerals - Strunz-mindat Grouping
| 9.EC. | Meifuite | KFe6(Si7Al)O19(OH)4Cl2 |
| 9.EC. | Balestraite | KLi2V5+Si4O12 |
| 9.EC. | Voloshinite | Rb(LiAl1.5◻0.5)(Al0.5Si3.5)O10F2 |
| 9.EC.05 | Talc | Mg3Si4O10(OH)2 |
| 9.EC.05 | Minnesotaite | Fe2+3Si4O10(OH)2 |
| 9.EC.05 | Willemseite | Ni3Si4O10(OH)2 |
| 9.EC.10 | Fluorluanshiweiite | KLiAl1.5(Si3.5Al0.5)O10F2 |
| 9.EC.10 | Garmite | CsLiMg2(Si4O10)F2 |
| 9.EC.10 | Gorbunovite | CsLi2(Ti,Fe)Si4O10(F,OH,O)2 |
| 9.EC.10 | Ferripyrophyllite | Fe3+Si2O5(OH) |
| 9.EC.10 | Manganiceladonite | K(MgMn3+◻)(Si4O10)(OH)2 |
| 9.EC.10 | Luanshiweiite | KLiAl1.5(Si3.5Al0.5)O10(OH)2 |
| 9.EC.10 | Pyrophyllite | Al2Si4O10(OH)2 |
| 9.EC.15 | Paragonite | NaAl2(AlSi3O10)(OH)2 |
| 9.EC.15 | Ferroaluminoceladonite | K(Fe2+Al◻)(Si4O10)(OH)2 |
| 9.EC.15 | Nanpingite | CsAl2(AlSi3O10)(OH,F)2 |
| 9.EC.15 | Ferroceladonite | K(Fe2+Fe3+◻)(Si4O10)(OH)2 |
| 9.EC.15 | Ganterite | Ba0.5(Na,K)0.5Al2(Si2.5Al1.5)O10(OH)2 |
| 9.EC.15 | Kreiterite | CsLi2Fe3+(Si4O10)F2 |
| 9.EC.15 | Roscoelite | KV3+2(AlSi3O10)(OH)2 |
| 9.EC.15 | Aluminoceladonite | K(MgAl◻)(Si4O10)(OH)2 |
| 9.EC.15 | Tobelite | (NH4)Al2(AlSi3O10)(OH)2 |
| 9.EC.15 | Tainiolite | KLiMg2(Si4O10)F2 |
| 9.EC.15 | Celadonite | K(MgFe3+◻)(Si4O10)(OH)2 |
| 9.EC.15 | Chromceladonite | K(MgCr◻)(Si4O10)(OH)2 |
| 9.EC.15 | Montdorite | KFe2+1.5Mn2+0.5Mg0.5Si4O10(F,OH)2 |
| 9.EC.15 | Chromphyllite | KCr2(AlSi3O10)(OH)2 |
| 9.EC.15 | Boromuscovite | KAl2(BSi3O10)(OH)2 |
| 9.EC.15 | 'UM1988-22-SiO:AlCaFFeHKLiMg' | KLiMgAl2Si3O10F2 |
| 9.EC.15 | Chernykhite | (Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2 |
| 9.EC.15 | Muscovite | KAl2(AlSi3O10)(OH)2 |
| 9.EC.20 | Masutomilite | K(LiAlMn2+)[AlSi3O10]F2 |
| 9.EC.20 | Oxyphlogopite | K(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2 |
| 9.EC.20 | 'Chloroferrokinoshitalite' | (Ba,K)(Fe2+,Mg)3(Al2Si2O10)(Cl,OH,F)2 |
| 9.EC.20 | Siderophyllite | KFe2+2Al(Al2Si2O10)(OH)2 |
| 9.EC.20 | Sokolovaite | CsLi2Al(Si4O10)F2 |
| 9.EC.20 | Hendricksite | KZn3(Si3Al)O10(OH)2 |
| 9.EC.20 | Tetraferriphlogopite | KMg3(Si3Fe3+)O10(OH)2 |
| 9.EC.20 | Fluorannite | KFe2+3(Si3Al)O10F2 |
| 9.EC.20 | Aspidolite | NaMg3(AlSi3O10)(OH)2 |
| 9.EC.20 | Suhailite | (NH4)Fe2+3(AlSi3O10)(OH)2 |
| 9.EC.20 | Ephesite | NaLiAl2(Al2Si2O10)(OH)2 |
| 9.EC.20 | Norrishite | KLiMn3+2(Si4O10)O2 |
| 9.EC.20 | Phlogopite | KMg3(AlSi3O10)(OH)2 |
| 9.EC.20 | Yangzhumingite | KMg2.5(Si4O10)F2 |
| 9.EC.20 | Orlovite | KLi2Ti(Si4O10)OF |
| 9.EC.20 | Tetraferriannite | KFe2+3(Si3Fe3+)O10(OH)2 |
| 9.EC.20 | Shirokshinite | K(NaMg2)(Si4O10)F2 |
| 9.EC.20 | Trilithionite | K(Li1.5Al1.5)(AlSi3O10)(F,OH)2 |
| 9.EC.20 | Polylithionite | KLi2Al(Si4O10)(F,OH)2 |
| 9.EC.20 | Shirozulite | KMn2+3(Si3Al)O10(OH)2 |
| 9.EC.20 | Preiswerkite | NaMg2Al(Al2Si2O10)(OH)2 |
| 9.EC.20 | Fluorophlogopite | KMg3(Si3Al)O10F2 |
| 9.EC.20 | Wonesite | (Na,K,◻)(Mg,Fe,Al)6(Si,Al)8O20(OH,F)4 |
| 9.EC.20 | 'UM2004-49-SiO:AlCsFHKLi' | (Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2 |
| 9.EC.20 | Fluorotetraferriphlogopite | KMg3(Fe3+Si3O10)F2 |
| 9.EC.20 | Annite | KFe2+3(AlSi3O10)(OH)2 |
| 9.EC.20 | Eastonite | KMg2Al(Al2Si2O10)(OH)2 |
| 9.EC.22 | 'Pimelite' | Ni3Si4O10(OH)2 · 4H2O |
| 9.EC.30 | Margarite | CaAl2(Al2Si2O10)(OH)2 |
| 9.EC.35 | Kinoshitalite | (Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2 |
| 9.EC.35 | Ferrokinoshitalite | (Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2 |
| 9.EC.35 | Clintonite | CaAlMg2(SiAl3O10)(OH)2 |
| 9.EC.35 | Oxykinoshitalite | (Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2 |
| 9.EC.35 | Fluorokinoshitalite | BaMg3(Al2Si2O10)F2 |
| 9.EC.35 | Bityite | CaLiAl2(AlBeSi2O10)(OH)2 |
| 9.EC.35 | Anandite | (Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2 |
| 9.EC.40 | Beidellite | (Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O |
| 9.EC.40 | Volkonskoite | Ca0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2O |
| 9.EC.40 | Nontronite | Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O |
| 9.EC.40 | Kurumsakite | (Zn,Ni,Cu)8Al8V5+2Si5O35 · 27H2O (?) |
| 9.EC.40 | Yakhontovite | (Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2O |
| 9.EC.45 | Swinefordite | Li(Al,Li,Mg)3((Si,Al)4O10)2(OH,F)4 · nH2O |
| 9.EC.45 | Hectorite | Na0.3(Mg,Li)3(Si4O10)(F,OH)2 |
| 9.EC.45 | Zincsilite | Zn3Si4O10(OH)2 · 4H2O (?) |
| 9.EC.45 | Hanjiangite | Ba2CaV3+Al(H2AlSi3O12)(CO3)2F |
| 9.EC.45 | Spadaite | MgSiO2(OH)2 · H2O (?) |
| 9.EC.45 | Ferrosaponite | Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O |
| 9.EC.45 | Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 |
| 9.EC.45 | Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
| 9.EC.45 | Sauconite | Na0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O |
| 9.EC.50 | Vermiculite | Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O |
| 9.EC.52 | 'Tarasovite' | near NaKAl11Si13O40(OH)9 · 3H2O |
| 9.EC.55 | Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| 9.EC.55 | Borocookeite | (LiAl4◻)[BSi3O10](OH)8 |
| 9.EC.55 | Franklinfurnaceite | Ca2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8 |
| 9.EC.55 | Pennantite | Mn2+5Al(AlSi3O10)(OH)8 |
| 9.EC.55 | Vakhrushevaite | Mg5Cr(AlSi3O10)(OH)8 |
| 9.EC.55 | Nimite | Ni5Al(AlSi3O10)(OH)8 |
| 9.EC.55 | Cookeite | (LiAl4◻)[AlSi3O10](OH)8 |
| 9.EC.55 | Gonyerite | Mn2+5Fe3+(Fe3+Si3O10)(OH)8 |
| 9.EC.55 | Chamosite | Fe2+5Al(AlSi3O10)(OH)8 |
| 9.EC.55 | 'Orthochamosite' | (Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8 |
| 9.EC.55 | Baileychlore | Zn5Al(AlSi3O10)(OH)8 |
| 9.EC.55 | Sudoite | Mg2Al3(AlSi3O10)(OH)8 |
| 9.EC.55 | Glagolevite | Na(Mg,Al)6(AlSi3O10)(OH,O)8 |
| 9.EC.55 | Donbassite | Al4.33(AlSi3O10)(OH)8 |
| 9.EC.60 | Dozyite | Mg7Al2(Al2Si4O15)(OH)12 |
| 9.EC.60 | Rectorite | (Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O |
| 9.EC.60 | Corrensite | (Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O |
| 9.EC.60 | Aliettite | Ca0.2Mg6((Si,Al)8O20)(OH)4 · 4H2O |
| 9.EC.60 | Karpinskite | (Ni,Mg)2Si2O5(OH)2 (?) |
| 9.EC.60 | Lunijianlaite | Li0.7Al6.2(AlSi7O20)(OH,O)10 |
| 9.EC.60 | Tosudite | Na0.5(Al,Mg)6((Si,Al)8O18)(OH)12 · 5H2O |
| 9.EC.60 | Hydrobiotite | K(Mg,Fe2+)6((Si,Al)8O20)(OH)4 · nH2O |
| 9.EC.60 | Saliotite | (Li,Na)Al3(AlSi3O10)(OH)5 |
| 9.EC.60 | Kulkeite | Mg8Al(AlSi7O20)(OH)10 |
| 9.EC.60 | Brinrobertsite | Na0.3Al4(Si4O10)2(OH)4 · 3.5 H2O |
| 9.EC.65 | Macaulayite | (Fe,Al)24Si4O43(OH)2 |
| 9.EC.70 | Burckhardtite | Pb2(Fe3+Te6+)[AlSi3O8]O6 |
| 9.EC.75 | Niksergievite | (Ba,Ca)2Al3(AlSi3O10)(CO3)(OH)6 · nH2O |
| 9.EC.75 | Ferrisurite | (Pb,Ca)2.4Fe3+2(Si4O10)(CO3)1.7(OH)3 · nH2O |
| 9.EC.75 | Surite | (Pb,Ca)3(Al,Fe2+,Mg)2((Si,Al)4O10)(CO3)2(OH)2 |
| 9.EC.80 | Kegelite | Pb8Al4(Si8O20)(SO4)2(CO3)4(OH)8 |
Fluorescence of Montmorillonite
Usually not fluorescent, except by mixtures with autunite, etc.
Other Information
Thermal Behaviour:
Basal spacings collapse to lower values with dehydration
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Montmorillonite in petrology
An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.
Internet Links for Montmorillonite
mindat.org URL:
https://www.mindat.org/min-2821.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Montmorillonite
Reference List:
Clark, G. L.; Grim, R. E.; Bradley, W. F. (1937) A Study of the Behavior of Montmorillonite upon Wetting. Zeitschrift für Kristallographie, 97 (1-6). 216-222 doi:10.1524/zkri.1937.97.1.216
Hofmann, Ulrich; Maegdefrau, Edmund (1938) Die Kristallstruktur des Montmorillonits. Zeitschrift für Kristallographie, 98 (1-6). 299-323 doi:10.1524/zkri.1938.98.1.299
Grim, R. E.; Bradley, W. F. (1940) Investigation of the effect of heat on the clay minerals illite and montmorillonite. Journal of the American Ceramic Society, 23 (8). 242-248 doi:10.1111/j.1151-2916.1940.tb14263.x
MACEWAN, DOUGLAS M. C. (1944) Identification of the Montmorillonite Group of Minerals by X-Rays. Nature, 154 (3914). 577-578 doi:10.1038/154577b0
McConnell, Duncan (1950) The crystal chemistry of montmorillonite. American Mineralogist, 35 (3-4) 166-172
Earley, J. W., Osthaus, B. B., Milne, and I. H. (1953) Purification and properties of montmorillonite. American Mineralogist, 38 (7-8) 707-724
Schüller, A. (1953) Eine natürliche Mineralsynthese von Montmorillonit im Nephelinbasalt des Großen Dolmar bei Meiningen (Rhön). Heidelberger Beiträge zur Mineralogie und Petrographie, 3 (6). 472-494 doi:10.1007/bf01129199
Grim, R. E., Kulbicki, G. (1961) Montmorillonite: High temperature reactions and classification. American Mineralogist, 46 (11-12) 1329-1369
Tettenhorst, Rodney (1964) Interstratification in Montmorillonite. Clays and Clay Minerals, 13 (1) 85-93 doi:10.1346/ccmn.1964.0130109
Russell, J. D. (1964) Infra-Red Spectroscopic Study of the Dehydration of Montmorillonite and Saponite. Clay Minerals, 5 (32) 443-464 doi:10.1180/claymin.1964.005.32.04
McAtee, James L., Henslee, and Walter (1969) Electron-microscopy of montmorillonite dispersed at various pH. American Mineralogist, 54 (5-6) 869-874
Harder, H. (1969) Illit- und Montmorillonit-Synthese bei niedrigen Temperaturen. Die Naturwissenschaften, 56 (5). 279 doi:10.1007/bf00633925
Tettenhorst, Rodney, Roberson, Herman E. (1973) X-ray diffraction aspects of montmorillonites. American Mineralogist, 58 (1-2). 73-80
Velde, Bruce (1973) Phase Equilibria in the System MgO-Al2O3-SiO2-H2O: Chlorites and Associated Minerals. Mineralogical Magazine, 39 (303) 297-312 doi:10.1180/minmag.1973.039.303.06
Gillespie, James B., Lindberg, James D., Smith, and Michael S. (1974) Visible and near-infrared absorption coefficients of montmorillonite and related clays. American Mineralogist, 59 (9-10) 1113-1116
Lagaly, G., Fernandez Gonzalez, M., Weiss, Armin (1976) Problems in layer-charge determination of montmorillonites. Clay Minerals, 11 (3) 173-187 doi:10.1180/claymin.1976.011.3.01
Sherman, David M., Vergo, Norma (1988) Optical spectrum, site occupancy, and oxidation state of Mn in montmorillonite. American Mineralogist, 73 (1-2) 140-144
Groos, A. F. Koster Van, Guggenheim, Stephen (1989) Dehydroxylation of Ca- and Mg-exchanged montmorillonite. American Mineralogist, 74 (5-6) 627-636
Muller, F., Besson, G., Manceau, A., Drits, V.-A. (1997) Distribution of isomorphous cations within octahedral sheets in montmorillonite from Camp-Bertaux. Physics and Chemistry of Minerals, 24 (3) 159-166 doi:10.1007/s002690050029
Petit, S., Caillaud, J ., Righi, D., Madejová, J ., Elsass, F., Köster, H. M. (2002) Characterization and crystal chemistry of an Fe-rich montmorillonite from Ölberg, Germany. Clay Minerals, 37 (2) 283-297 doi:10.1180/0009855023720034
BURFORD, EUAN P., KIERANS, MARTIN, GADD, GEOFFREY M. (2003) Geomycology: fungi in mineral substrata. Mycologist, 17 (3). 98-107 doi:10.1017/s0269915x03003112
Christidis, G. E. (2006) Genesis and compositional heterogeneity of smectites. Part III: Alteration of basic pyroclastic rocks--A case study from the Troodos Ophiolite Complex, Cyprus. American Mineralogist, 91 (4) 685-701 doi:10.2138/am.2006.2001
Localities for Montmorillonite
Showing 2,053 localities.
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Afghanistan | |
| Betts (n.d.) |
| DeWitt et al. (2020) | |
Antarctica | |
| Gyollai et al. (2016) |
| Browne |
| Kammerer (2011) | |
Argentina | |
| Padrón de Minas de la Provincia de Chubut (2005) |
| Padrón de Minas de la Provincia de Chubut (2005) | |
| Padrón de Minas de la Provincia de Chubut (2005) |
| Padrón de Minas de la Provincia de Chubut (2005) | |
| Padrón de Minas de la Provincia de Chubut (2005) | |
| Padrón de Minas de la Provincia de Chubut (2005) | |
| Padrón de Minas de la Provincia de Chubut (2005) | |
| Padrón de Minas de la Provincia de Chubut (2005) | |
| Padrón de Minas de la Provincia de Chubut (2005) | |
| Padrón de Minas de la Provincia de Chubut (2005) | |
| Bouhier et al. (2023) |
| Padrón de Minas de la Provincia de Chubut (2005) |
| Helvaci et al. (2000) +2 other references |
| Singer et al. (2008) |
| RUBINSTEIN |
| Musso et al. (2022) |
| Rainoldi et al. (2024) |
| Singer et al. (2008) |
| Mas et al. (1994) |
| ROBL +1 other reference |
| Paz et al. (2016) | |
| Zubía et al. (2008) |
| Valencia (2024) |
| www.mineralatlas.com (n.d.) |
| Peña (1970) | |
Armenia | |
| Bowell et al. (2021) |
| Kolpakova et al. (2001) |
| Pavel M. Kartashov (n.d.) |
Atlantic Ocean | |
| Martos-Villa +5 other references | |
| Milinovic +6 other references |
Australia | |
| Wilde (1988) |
| Henley et al. (2001) |
| Henley et al. (2001) |
| England (1994) |
| Singer et al. (2008) |
| Markham et al. (1974) |
| Dodds (1969) |
| Graham et al. (2002) |
| Henley et al. (2001) |
| Adamson (1962) |
| England (1984) |
| Brown et al. (2001) |
| Segnit (1973) |
| Graham et al. (2002) |
| Podgson RE | |
| Scriven et al. (2007) |
| O'Toole (1973) |
| Magirian (1998) |
| Rix (1964/94) |
| Loughnan et al. (1983) |
| Zeissink (1969) |
| Sielecki (1988) |
| Sielecki (1988) | |
| Singer et al. (2009) |
| www.smedg.org.au (2011) |
| |
| Nethery et al. (1998) |
| Edraki et al. (2025) |
| Singer et al. (2008) |
| - (n.d.) |
| Sahlström et al. (2016) | |
| Collection of Mark Willoughby |
| Eggleton (1959) | |
| |
| |
| Hong et al. (2023) |
| |
| |
| |
| Gordon et al. (2014) | |
| |
| Hong et al. (2023) | |
| Anon (2013) |
| Matsubara et al. (1984) | |
| Bottrill (1989) |
| Bottrill et al. (2008) |
| Taheri +1 other reference |
| Bottrill et al. (2008) |
| M Latham & R Bottrill +1 other reference |
| www.crocoite.com (2003) |
| Patterson |
| |
| Sorrell (n.d.) |
| Birch et al. (1979) |
| Birch (1989) |
| Birch et al. (1993) |
| Tschernich (1992) |
| Carr et al. (2021) |
| Jacobson et al. (2007) |
| Huston (2001) |
| Cook et al. (2023) |
| Murrin Murrin Nickel Laterite Deposit +2 other references | |
| Graham (2003) |
| Nickel (1982) |
| Lintern (1998) |
| Francesco et al. (2019) |
| Grguric (2003) |
| Recent Investigations of the Mitchell ... +3 other references |
Austria | |
| U. Kolitsch et al. (2009) +1 other reference |
| Huber et al. (1977) +1 other reference |
| Niedermayr et al. (1995) |
| Niedermayr et al. (1995) |
| |
| Niedermayr et al. (1995) |
| |
| Zirkl (1961) |
| Knobloch (1982) |
| Neschen (n.d.) |
| Holzer et al. (1963) |
| Strasser (1989) |
| Strasser et al. (1998) |
| Strasser (1989) |
| Strasser (1989) |
| Strasser (1989) |
| Strasser (1989) |
| Strasser (1989) |
| - (n.d.) | |
| Strasser (1989) +2 other references |
| Strasser (1989) |
| Taucher (1998) +1 other reference |
| Postl (1978) |
| Taucher et al. (1992) |
| Hollerer (1999) |
| Freyn (1902) | |
| Postl et al. (1996) |
| [var: Ferrimontmorillonite] Postl et al. (1996) | |
| Aufschluss 1972 (SB) |
| Postl et al. (1996) |
| Taucher (1989) |
| Reiter (1999) |
Belarus | |
| E.P. Shpanov et al. (1989) |
Belgium | |
| Thorez (1973) |
| Hatert et al. (2002) |
| Hatert et al. (2002) +1 other reference |
| Hatert et al. (2002) |
| Breithaupt (1832) +2 other references |
| Blondieau et al. (2017) |
Bolivia | |
| Biagioni et al. (2022) |
| Cacho et al. (2019) |
| Jiménez-Franco et al. (2018) |
Bosnia and Herzegovina | |
| Bevandić et al. (2018) |
Brazil | |
| Santos et al. (2024) |
| Queiroz (2016) | |
| Costa-Silva et al. (2026) |
| Waber et al. (1992) +1 other reference |
| Cassedanne et al. (1982) |
| Atencio et al. (2004) | |
| Cassedanne et al. (1999) |
| Cassedanne et al. (1994) |
| Waber (1991) |
| Cassedanne et al. (1980) |
| SALLUN FILHO (orgs.) +1 other reference |
| e Souza et al. (2020) |
| JENKINS II (1987) |
| Costa et al. (2024) |
| Bergmann (2009) |
| Bergmann (2009) | |
| Queiroz (2016) |
Bulgaria | |
| Aleksiev (1967) +1 other reference |
| Kunov et al. (2001) |
| Georgiev et al. (2002) +1 other reference |
| Georgiev et al. (2002) |
Cambodia | |
| United Nations (1993) |
| Piilonen et al. (2023) |
Cameroon | |
| Lambert et al. (2008) |
Canada | |
| British Columbia Ministry of Energy |
| Tschernich et al. (1982) +1 other reference |
| Singer et al. (2008) |
| Lypaczewski et al. (2020) | |
| Singer et al. (2008) | |
| Singer et al. (2008) | |
| Singer et al. (2008) | |
| Singer et al. (2008) | |
| personal correspondence with Giles ... |
| personal correspondence with Giles ... +1 other reference |
| Singer et al. (2008) | |
| Singer et al. (2008) | |
| Duuring et al. (2009) |
| Personal correspondance with Giles ... |
| Breasley et al. (2024) |
| Tschernich (1992) |
| Bannatyne (1985) |
| 153-155. +2 other references | |
| Paul (1984) |
| Norman Wilson collection |
| Canadian Museum of Nature collection (Specimen 40536) |
| Schindler et al. (2012) |
| Ontario Ministry of Northern ... |
| Piilonen et al. (2024) |
| Olivier Langelier Collection |
| Robinson et al. (1996) |
| Canadian Museum of Nature collection |
| CLÉMENT |
| Horváth & Spertini (2008 & 2009) |
| Singer et al. (2008) |
| Grice (1989) +1 other reference |
| Horváth et al. (1998) |
| 176-178. +2 other references |
| Sabina (1983) | |
| Sabina (1987) |
| Knipping (1974) |
| Watson et al. (1996) |
| Singer et al. (2008) |
Chile | |
| Camus et al. (1991) |
| Schlüter et al. (2000) +2 other references | |
| Gerhard Möhn Collection |
| Freeport-McMoRan |
| Cortecci et al. (2005) | |
| Vidal et al. (2022) |
| Guo et al. (2022) |
| Codelco |
| Singer et al. (2008) |
| Parker L.R./Salas R./Pérez G. (1963) +2 other references |
| - (n.d.) +1 other reference |
| XRD by Joachim Lorenz +1 other reference |
| Lohmeier et al. (2025) | |
| Maksaev et al. (2010) |
| Singer et al. (2008) |
| YAMANA GOLD INC. ANNUAL INFORMATION ... |
| Singer et al. (2008) |
| Teck Resources Limited | |
| - (2003) +1 other reference | |
China | |
| Yanhua Wang and Hanzhu Wang (1998) |
| Fang et al. (2026) |
| LIU et al. (2021) | |
| Qingtao Huang (1984) | |
| Zhangru Zhu (1993) |
| Duan et al. (2022) |
| Wang et al. (2025) | |
| Wang et al. (2024) +1 other reference | |
| Songmao Chen (1984) |
| Fan et al. (2026) |
| Shufeng Huang et al. (1999) |
| Yunhuai Lin (1982) +2 other references |
| Acta Petrologica et Mineralogica 11 (2) |
| Peters (2002) |
| Hewei Zhang (1982) +2 other references |
| Huang et al. (2026) |
| Mao Jingwen et al. (2000) |
| Mingzuan Xu et al. (2011) | |
| Jinzhong Qi et al. (2008) |
| Zhang et al. (2025) |
| Liang et al. (2025) |
| Dahlkamp (2009) |
| Lin Niu (1994) |
| Dajing Chen et al. (2001) |
| Zhangling Liu (1980) +2 other references |
| Shuhui Cai et al. (2012) |
| Dairong Yan et al. (2006) |
| Shouquan Zhu (2001) |
| Yinsheng Lang et al. (2007) |
| Zhang et al. (2026) |
| Shihua Qi et al. (2000) |
| Zheng et al. (2024) |
| Dajing Chen et al. (2001) |
| Yinsheng Lang et al. (2007) |
| Yinsheng Lang et al. (2007) | |
| Yinsheng Lang et al. (2007) | |
| Yinsheng Lang et al. (2007) | |
| www.portergeo.com.au (2007) |
| Dajing Chen and Mingshou Yang (2000) +1 other reference |
| Sun et al. (2021) | |
| Liu et al. (2015) |
| Yaojian Xu and Tieping Wu (2008) |
| Kehua Yin (2009) |
| Chen et al. (2022) |
| Tian et al. (2025) |
| Surong Ji et al. (1987) |
| Jiuming Li et al. (2006) |
| Qianwen Cao and Yaowu Ren (1990) | |
| 成嘉伟 et al. (2023) |
| Dahlkamp (2009) +1 other reference |
| Zhiguo Zhang et al. (2008) +2 other references |
| Jinzhong Qi et al. (2000) |
| Zhaojun Meng et al. (2011) +1 other reference |
| Qin et al. (2026) |
| Zhai et al. (2015) |
| pubs.usgs.gov (2006) |
| Bai et al. (2024) |
| Li et al. (2019) |
| Shouting Zhang et al. (2004) |
| Gao et al. (2024) |
| Meng et al. (2022) |
| Senpo Wen (2009) |
| Wang et al. (2024) |
| Senpo Wen et al. (2008) | |
| Song et al. (2024) |
| Li et al. (2025) |
| Qinghai Ji et al. (2013) |
| Li (2007) |
| Jingqu Yao (1992) |
| Jingqu Yao (1992) | |
| Yanbing Tang (2005) +2 other references |
| Chu et al. (2023) | |
| Jingqu Yao (1992) |
| Chao Chen and Fapeng Xie (1986) |
| Linjiang Wang et al. (1999) |
| Liu (2017) |
| Wenguang Li (1997) +1 other reference |
| Wang et al. (2022) |
| Fushan Wang (1991) | |
| Fushan Wang (1991) | |
| Li et al. (2023) |
| Chen et al. (2022) |
| Manxiang Huang (1991) |
| National Geological Archives of China ... |
| [var: Askanite] Zhenmi Liu (2000) |
| Qing-chang (1981) |
| Wang et al. (2024) |
| Ding et al. (2024) |
| Luo et al. (2014) |
| Zhong Wang (2004) |
| Lei Ji et al. (1994) |
| Yingxia Xu et al. (2006) |
| Hu et al. (2025) |
| Tian et al. (2023) +1 other reference |
| Huang et al. (2025) | |
| Yi Luo et al. (2012) | |
| Li et al. (2021) |
| Jia Li et al. (1998) |
| Jia Li et al. (1998) | |
| Zhang et al. (2020) |
| Kai Meng et al. (2009) +1 other reference |
| Yao +7 other references |
| Tianhu Chen et al. (2004) |
| Ruishi Yang and Wenguang Li (2001) | |
| Sisong Chen et al. (1980) |
| Kecong Han and Shengyun Ma (1985) |
| Yang et al. (2026) |
| Dahlkamp (2009) +1 other reference | |
| Chen +4 other references |
| Wenle Zeng et al. (2010) |
| Xinkui Xiang (1992) +1 other reference |
| Fu et al. (2023) | |
| Zongyao et al. (2005) |
| Shufang He and Jianping Lu (2001) |
| Desong Lin (1993) |
| Jie Yao et al. (2002) |
| Zhixian Liu (1985) |
| Renyi Chen and Zhongyao Rui (1993) |
| Jiangli Pang (1999) |
| www.sud-chemie.com.cn (n.d.) |
| Guangyu Zhou (1983) |
| Dahlkamp (2009) |
| wrgis.wr.usgs.gov (2004) |
| Chang Xu (1985) +1 other reference |
| Liu et al. (2026) | |
| Chang Xu (1985) |
| Chang Xu (1985) |
| Chang Xu (1985) | |
| Chang Xu (1985) | |
| Chang Xu (1985) +1 other reference |
| Chang Xu (1985) +1 other reference |
| Chang Xu (1985) +1 other reference | |
| Wang et al. (2026) |
| Ni et al. (2026) | |
| Xueming Wang et al. (2001) |
| Wang et al. (2023) | |
| [1]许高奇 et al. (1) |
| Zhongtang Yang et al. (2008) +1 other reference |
| Zilin Tang et al. (1988) |
| Zhou et al. (2025) |
| Dahlkamp (2009) |
| Bingshe Zhang et al. (2013) |
| Liu et al. (2024) |
| Jianchao Liu et al. (2010) |
| Zhang et al. (2026) |
| Wang et al. (2025) |
| Hao et al. (2024) |
| [var: Calcium-Montmorillonite] Yongtao Zhang and Guiqin Tang (1986) |
| Wang et al. (2025) |
| Wang et al. (2025) |
| Xiaoming Qu et al. (2001) |
| Peters (2002) |
| Zhaoying Liu and Wang Zufu Wang (1989) |
| Huang +5 other references |
| Chang Xu (1985) |
| Chang Xu (1985) +1 other reference |
| Chang Xu (1985) |
| Chang Xu (1985) +1 other reference | |
| Chang Xu (1985) +1 other reference | |
| Zhaoyan Gu et al. (1994) |
| Chang Xu (1985) +1 other reference |
| Chang Xu (1985) | |
| Chang Xu (1985) |
| Zheng et al. (2025) |
| Hualing et al. (2026) | |
| Chang Xu (1985) |
| Junxing Zhao et al. (2011) |
| pubs.usgs.gov (2006) |
| Qingsheng Xu et al. (2011) |
| Dongan Wang (1986) |
| Wu et al. (2025) |
| Yang et al. (2020) +2 other references |
| Mianping Zheng et al. (2007) |
| Minghui Li et al. (2007) | |
| Zhian Qin (1999) |
| Tang (2005) |
| Che et al. (2024) |
| Yang et al. (2009) |
| Wang et al. (2001) +2 other references |
| Wang et al. (2025) |
| Tang (2005) | |
| Yang et al. (2005) |
| Yuan Feng et al. (2002) |
| Yushe Zhao and Bin Zhang (2014) | |
| Tang (2005) |
| Denghong Wang (1996) |
| Yang et al. (2009) |
| Min et al. (2005) |
| Guo Wang et al. (2000) +1 other reference | |
| Min et al. (2005) | |
| Tang (2005) |
| Wu Zhansheng et al. (2006) |
| Ji et al. (2024) |
| Long Xiao et al. (2002) +1 other reference |
| |
| |
| Zhang et al. (2004) |
| Tang (2005) |
| IAEA Technical Document 1396 (2004) | |
| Zhu et al. (2022) |
| Zhusen Yang et al. (2000) |
| Zengqian et al. (2003) |
| Cao et al. (2019) |
| Baiyou Chen et al. (2002) |
| Ruijun Chen et al. (1993) |
| Huaning Qiu et al. (2000) |
| Dengfang Wang and Canfa Da (1995) |
| Zheng et al. (2024) |
| Zheng et al. (2024) |
| Yonghong Jiang and Shengrong Li (2004) |
| Mao et al. (2024) |
| Dongmei Tang et al. (2006) |
| Peters et al. (2007) |
| Hanhe Liu (2007) |
| Jiang et al. (2026) |
| Huijin Lu and Jian Wang (2005) |
| Huijin Lu and Jian Wang (2005) |
| Shugen Zhang et al. (2006) |
| Huijin Lu and Jian Wang (2005) |
| Jishun Liu (1991) |
| Yaofu Zhang et al. (1991) |
Costa Rica | |
| Rodríguez et al. (2017) |
| Obando-Acuña et al. (2019) |
Czech Republic | |
| Litochleb +4 other references |
| Dolníček et al. (2024) |
| Pauliš +3 other references |
| Šmůla |
| Jirásek (2001) |
| Jan Hloušek |
| Scharm +7 other references |
| Fengl +3 other references |
| Pauliš et al. (2010) |
| Pauliš |
| Kašing et al. (2025) |
| Sejkora et al. (2007) |
| Kuttna +1 other reference | |
| Fengl (2.) |
| Rychlý et al. (1996) |
| Janouš (1995) +4 other references |
| Primas |
| Welser |
| Hrazdil (2001) |
| collection of Petr Fuchs |
| Sejkora (1998) |
| E.L. Clopton collection #ELC1482 and ... |
| Sejkora (1994) |
| Petr Fuchs collection | |
| Pauliš |
| Trnka M (1982) |
| Staněk (1991) +4 other references |
| Staněk (1997) | |
| Novák et al. (1999) | |
| Pauliš | |
Denmark | |
| Prior (1973) +1 other reference |
DR Congo | |
| |
Ecuador | |
| Singer et al. (2008) |
| Singer et al. (2008) |
| Singer et al. (2008) |
| Singer et al. (2008) |
Egypt | |
| USGS Open-File Report 02–156–A |
| Wenle Zeng and Yuntao Zhang (2009) |
El Salvador | |
| Torio-Henríquez (2007) |
Ethiopia | |
| Baumann et al. (1975) |
| Jelenc (1966) |
Eurasian Plate | |
| Ki Choi et al. (2024) +1 other reference |
| Wang et al. (2025) |
Fiji | |
| 1996 +4 other references |
| Orovan (2016) |
| Orovan (2016) |
Finland | |
| Ilkka Mikkola collection |
| Sarapää +8 other references |
| Al-Ani et al. (2018) |
| Mäki (1997) |
| Sandström et al. (2009) |
| Lahti |
| Alviola |
| Haapala (1966) |
France | |
| Nicolas et al. (1963) |
| Bull. Soc. Franç. Minéralo. ... |
| |
| P.G. Pelisson : "Etude Mineralogique et ... |
| |
| Pélisson (1989) |
| Pélisson (1989) |
| Pélisson (1989) |
| Pélisson (1989) |
| |
| De Ascençao Guedes (2003) |
| OLLIC Pascal Collection |
| Chauris (2014) |
| R. Pierrot |
| R. Pierrot |
| R. Pierrot |
| Velde (1968) |
| Dudoignon et al. (1989) |
| Dudoignon et al. (1989) | |
| Escande et al. (1973) +6 other references |
| Escande et al. (1973) +6 other references | |
| Belot (1978) |
| Deliens et al. (2004) |
| |
| Patureau et al. (2011) |
| [var: Delanovite] Dana et al. (1868) |
| Bulletin de la Société Géologique de France (1847) +1 other reference |
| Club Minéralogique de Saint-Juery (2025) |
| Boutry et al. (1986) |
| Berbain et al. (2005) |
| Manuel N. Bass (1971) |
| "Les minéralisations associées au volcanisme andésitique de Biot-Villeneuve Loubet (Alpes Maritimes) |
| www.mine-capgaronne.fr (2003) +1 other reference |
Georgia | |
| [var: Askanite] Ralph E. Grim (2011) |
| Varentsov (1996) |
| M. et al. (2019) |
Germany | |
| Weiß (1990) |
| Weiß (1990) | |
| Anthony Geneyton Collection |
| |
| Hentschel (1976) | |
| Volker Betz collection and photos | |
| Knöfel et al. (1964) |
| |
| 50. (in German) +1 other reference |
| Wittern (2001) |
| Weiß (1990) |
| Aufschluss 1977 (6) +1 other reference |
| Stähle et al. (2008) |
| Habel (2009) |
| Habel (2011) |
| |
| Wittern (2001) |
| |
| Müller (1984) |
| Wittern (2001) |
| Müller (1984) |
| Weiß (1990) |
| Lapis (7/8) |
| Weiß (1990) |
| Hanneberg et al. (2009) +1 other reference | |
| Weiß (1990) |
| Keck (2010) |
| Weiß (1990) |
| Weiß (1990) |
| Weiß (1990) |
| Aufschluss 1980 (6) |
| Weiß (1990) |
| Aufschluss 1980 (6) |
| Betz (2019) |
| Zeolite collection of Volker Betz |
| |
| Ehrenberg et al. (1982) |
| Weiß (1990) |
| |
| Weiß (1990) |
| Weiß (1990) |
| |
| Ko Jansen +1 other reference |
| Weiß (1990) |
| Weiß (1990) |
| Blaß et al. (2010) |
| |
| Neschen (n.d.) |
| Zeolite collection of Volker Betz |
| Weiß (1990) |
| Weiß (1990) |
| Weiß (1990) |
| Collection of Walter Göttler |
| Dreizler (1962) |
| Füchtbauer et al. (1956) |
| |
| |
| Weiß (1990) |
| Burns (2007) |
| G.R. Osinski et al. | |
| Schnorrer-Köhler (1991) |
| Frechen (1976) |
| Rykart et al. (1978) +1 other reference |
| Hentschel (1987) |
| Hentschel (1987) |
| Hentschel (1987) |
| Hentschel (1987) |
| collection of Ch.&H. Schäfer |
| Hentschel (1987) |
| 50. +1 other reference |
| Hentschel (1983) |
| Hentschel (1987) | |
| Hentschel (1987) | |
| Hentschel (1990) |
| Hentschel (1990) |
| Blaß et al. (1996) |
| Hentschel (1987) |
| Hentschel (1978) |
| in the collection of Hermann Fuchs |
| Weiß (1990) |
| Hentschel (1983) |
| Schüller et al. (1986) |
| Hentschel (1987) | |
| Hentschel (1993) |
| Hentschel (1987) |
| Hentschel (1983) |
| Hentschel (1983) | |
| Hentschel (1978) |
| Hentschel (1987) |
| Hentschel (1987) |
| Weiß (1990) |
| Petit et al. (2002) |
| Wittern (2001) |
| Schüller et al. (1950) |
| Lapis 30 (7/8) | |
| Wittern (2001) |
| Field collected by Alfredo Petrov |
| www.geologica-saxonica.de (n.d.) |
| Tröger (2012) |
| Leonhardt et al. (1991) |
| Wittern (2001) |
| Witzke et al. (1998) |
| Schüller (1953) |
Greece | |
| Kalatha et al. (2017) |
| Singer et al. (2008) |
| Singer et al. (2008) |
| Rieck (n.d.) |
| Kevrekidis et al. (2024) |
| Godelitsas et al. (2010) |
| Kilias et al. (2001) |
| Tsirigoti et al. (2025) |
Greenland | |
| Sørensen (2001) +1 other reference |
Hungary | |
| Kovács et al. (2003) |
| Szakáll et al. (1996) |
| |
| Kovács-Pálffy et al. (2008) |
| Kovács-Pálffy et al. (2008) | |
| Szakáll et al. (1996) |
| Koch (1985) |
| Szakáll et al. (1996) |
| |
| Szakáll-Jánosi: Minerals of Hungary |
| Szakáll & Jánosi. Minerals of Hungary |
| |
| www.geomania.hu (2013) | |
| Szakáll et al. (2010) |
| Szakáll (2002) | |
| Földessy et al. (2008) |
| Koch (1985) |
| Sándor et al. (2005) |
| Geoda - Journal of the Hungarian ... | |
| |
| Leél-Őssy et al. (2011) |
| |
| Szakáll & Jánosi. Minerals of Hungary |
| Szakáll et al. (1996) |
| Szakáll & Jánosi (1996) |
| Sándor et al. (2005) |
| Szakáll et al. (1996) +1 other reference |
Iceland | |
| Markússon et al. (2011) |
| Carson III (2015) |
India | |
| Nayak et al. (2024) |
| www.mpgovt.nic.in/mineralresources/ | |
| Shukla et al. (2021) |
| Banerjee |
| Banerjee | |
| Raju +1 other reference |
| Gotze +7 other references |
| G. K. Kesar (2011) |
| Barber (1981) |
| Nayak et al. (1998) |
Indian Ocean | |
| Nayak et al. (2011) | |
Indonesia | |
| Mulja et al. (2022) |
| Al Hakim et al. (2024) |
| Suhendra et al. (2024) |
| Singer et al. (2008) |
| Bambang Nugroho et al. (2024) |
| Singer et al. (2008) |
| Qi et al. (2024) |
| Taixu Luo (2008) |
| Al Hakim et al. (2017) |
| Milési et al. (1999) |
| Imawan et al. (2024) |
| Yuningsih et al. (2014) |
| Singer et al. (2008) |
| Abidin et al. (2014) |
Iran | |
| Ellahi et al. (2016) |
| Yousefi et al. (2025) |
| Hosseini-Dinani et al. (2016) |
| Derakhshani et al. (2009) |
| Khorasanipour (2015) | |
| Moghadam et al. (2026) |
| Ghadimi et al. (2013) |
| Fazli et al. (2022) |
| Fazli et al. (2024) |
| Goudarzi et al. (2024) | |
| Shahbazi et al. (2019) |
| Ali Sholeh et al. (2016) |
| Raeisi et al. (2023) |
| Fritz Ebner et al. (2018) |
| Afzal et al. (2017) |
| Sepidbar et al. (2021) |
| Shirkhani et al. (2025) |
| USGS database |
| Ghasemi Siani et al. (2022) |
| Mehrabi et al. (2016) |
Ireland | |
| de Haller +1 other reference |
Israel | |
| Weiner et al. (1993) |
| Bartura (1974) |
Italy | |
| Barbieri et al. (1984) |
| Balenzano F. (1981) | |
| Balenzano F. (1981) |
| Balenzano F. (1981) | |
| Balenzano F. (1981) | |
| Balenzano F. (1981) |
| Balenzano F. (1981) | |
| Balenzano F. (1981) | |
| Balenzano F. (1981) | |
| Catalano et al. (2014) +1 other reference |
| Bortolozzi et al. (2018) |
| Di Sabatino et al. (1979) |
| Stoppani et al. (1982) |
| Mattias et al. (1979) +1 other reference |
| 415. +1 other reference |
| Redazione (2005) |
| Carbone et al. (2002) |
| Palenzona et al. (1988) |
| Castellaro-Kampf |
| Maida (2002) |
| Bedognè et al. (2006) |
| Matteo Azili Collection |
| Piccoli et al. (2007) +1 other reference |
| Vola (2020) |
| |
| Mattioli V. - La Vigezzite +1 other reference |
| Michele Verdi et al. (2025) |
| Mattioli (1979 b) +3 other references |
| Appiani et al. (1995) +2 other references | |
| Uras (1974) +1 other reference |
| Singer et al. (2008) |
| Gamboni et al. (2012) |
| S. Cuccuru (2011) | |
| Billows (1941) |
| Padalino et al. (2003) |
| MacLean et al. (1997) |
| Simeone et al. (1999) |
| Stara et al. (1996) |
| Da Pelo et al. (2000) |
| Apollaro et al. (2023) |
| Savelli et al. (1999) | |
| Cardiano et al. (2008) | |
| Bortolozzi (n.d.) |
| De Michele (1974) |
| Bortolozzi et al. (2013) |
| |
| Dr. GIOVANNI MONTINI (GR) |
| Bonifazi (2020) |
| Benvenuti et al. (2000) |
| Bardi et al. (2009) |
| Cipriani et al. (1977) | |
| Eckhardt et al. (1997) |
| Eckhardt et al. (1997) | |
| Pasquale Antonazzo collection - 2008 |
| 50 +1 other reference |
| Andreatta (1950) |
| Boscardin |
| De Michele (1974) | |
| Boscardin et al. (1998) |
Japan | |
| Almeda (1985) |
| Shikazono et al. (1998) |
| Kagaya (1962) |
| Akira Kato (2011) |
| Hideo Kuroda (1978) | |
| - (n.d.) | |
| Kim (1994) |
| INOUE et al. (1991) |
| ... |
| Atsushi ISHIHARA |
| Chunxie Pu (1978) | |
| Alfredo Petrov collection |
| Itwatsuki T. and H. Yoshida (1999) |
| Yamada (2004) |
| - (n.d.) |
| Sakae et al. (1975) +1 other reference |
| Watanabe J and Hasegawa K (1986) |
| Nakamoto et al. (1969) |
| Myint (1996) |
| Ohe Rikosha specimens |
| Iichiro Takahashi (1957) |
| Kimbara et al. (1982) |
| - (n.d.) |
| Arribas et al. (2018) |
| SHIKAZONO et al. (1990) |
| Fulin Zhang et al. (1986) +1 other reference | |
| Ibaraki et al. (1991) | |
| Matsuhisa et al. (1985) |
| TAKEUCHI et al. (1984) | |
| - (n.d.) |
| Narita (1961) +2 other references |
| Arribas et al. (2018) | |
| Narita (1963) |
| Narita (1963) | |
| - (n.d.) +1 other reference | |
| Fujii et al. (1971) |
| Fujii et al. (1971) |
| Nokleberg et al. (2010) |
| Yamada (2004) |
| Display captions at local museum. | |
| - (n.d.) |
| geopubs.wr.usgs.gov (2004) +1 other reference |
| Matsueda (1980) |
| Suzuki et al. (2008) |
| Suzuki et al. (2008) | |
| Yeats et al. (2017) |
| Ishibashi (1974) |
| Nakatsugawa Mineral Museum (Gifu Prefecture, Japan) |
| Sudo et al. (1967) |
| Yamada (2004) |
| Marumo et al. (2008) |
| Amer.Min. (1959) |
Jordan | |
| Techer et al. (2006) |
Kazakhstan | |
| Jermolenko (2002) |
| Saburov (2005) |
| - (2005) |
| Yegorov et al. (1970) |
| Kurmangazhina et al. (2026) |
| Karshigina et al. (2018) |
| Motovilov et al. (2026) |
Kosovo | |
| Palinkaš +6 other references |
Kyrgyzstan | |
| Singer et al. (2008) |
| Soloviev (2011) |
Madagascar | |
| Federico Pezzotta XRD analysis |
| Di Cecco (2013) |
| Behier (1963) |
| Knut Edvard Larsen collection # M-538 (Similar specimen analyzed by XRD, pers. com. F.Pezzotta 21.04.2000) |
Malaysia | |
| Caisheng Zhao et al. (2004) |
Marshall Islands | |
| Rex (1967) | |
Mexico | |
| Moore (1998) |
| Hernández-Herrera et al. (2025) |
| Faudoa-Gómez et al. (2024) | |
| Econ Geol (1991) +1 other reference | |
| Econ Geol (1991) | |
| Megaw (1990) |
| Sotelo (2016) |
| - (SGM, 2019) |
| Brearley et al. (1998) |
| Querol +1 other reference |
| |
| Am Min (1955) |
| Yta et al. (2005) |
| Minera Autlan |
| Morgan (2017) |
| Singer et al. (2008) |
| Li et al. (2022) |
| Ruiz et al. (1980) |
| Espinosa Perea (1999) |
| Garcia y Barragan (1975) |
| Singer et al. (2005) |
| Dilley (1993) |
Middle East | |
| Gross (1977) | |
Moldova | |
| Vasile et al. (2007) |
Mongolia | |
| Wu et al. (2024) |
| N.V. Vladykin data |
| Hawthorne et al. (1986) | |
| Davaasuren et al. (2016) | |
| Singer et al. (2008) |
Morocco | |
| Weiß (2006) |
Mozambique | |
| Wilson et al. (2000) |
| Gomes et al. (2022) |
| Wilson et al. (2000) |
Myanmar | |
| Wang et al. (2026) |
Namibia | |
| King (n.d.) |
| Warta et al. (2006) +1 other reference |
| Gebhard (1999) |
| AVZ Minerals |
| Cairncross (1997) | |
Nazca Plate | |
| Zawadzki et al. (2022) +1 other reference | |
Netherlands | |
| T.G. Nijland |
New Zealand | |
| Carlson et al. (1974) |
| Mac Beggs (1978) |
| Lloyd et al. (1996) |
| Jones (1972) |
| Dickey (1968) |
| Reay et al. (2002) |
| Mulliner (2006) |
| Mossman et al. (2000) |
| Mossman et al. (2000) | |
| Sherwood et al. (1992) |
| Singh (2015) |
| Railton et al. (1990) |
| Rabone et al. (1989) | |
| Rabone | |
| Courtney et al. (1990) |
| Moore (1979) |
| Moore (1979) | |
Nicaragua | |
| Hynek et al. (2013) |
| Hynek et al. (2013) |
| Hynek et al. (2013) |
| Hynek et al. (2013, March) +1 other reference | |
Niger | |
| www.cnncintl.com (2015) |
North America | |
| 182-183. +1 other reference | |
North Korea | |
| Tsuda (1969) |
| Pavel M. Kartashov (n.d.) +1 other reference |
North Macedonia | |
| Temovski (2016) |
| Radusinovic (1966) |
| Serafimovski et al. (2016) |
| Radusinovic (1974) | |
Norway | |
| Weibye (1848) |
| Breivik (2015) |
| Revheim (2006) |
| Nilssen et al. (1973) +2 other references |
| Nordrum (1999) |
| Nordrum et al. (2006) |
| Raade et al. (1980) +1 other reference |
| Kvamsdal (1998) |
| Larsen (1978) |
| Nordrum (2007) |
| Nordli et al. (1997) +1 other reference | |
| Ihlen (1986) |
| Wel (1972) | |
| Raade et al. (1993) |
| Hjelle et al. (1960) +1 other reference |
| Nordrum (2004) |
| Husdal (2008) |
| Kvamsdal (1990) +1 other reference |
| Kvamsdal (2018) |
| Kristiansen (2022) |
| Larsen (2025) |
| Nordrum (2000) |
| Larsen et al. (2005) |
| Engvoldsen et al. (1991) | |
| Berge (n.d.) |
| Brøgger (1890) |
| Berge (n.d.) |
| Berge (n.d.) | |
| Larsen et al. (1976) |
| Brøgger (1890) |
| Åsheim et al. (2008) | |
| Berge (n.d.) |
| Engvoldsen et al. (1991) |
| Larsen (1993) |
| Salter et al. (1974) |
| Witsø (1994) |
| Andersen (2017) |
| Larsen (2004) |
| Nordrum et al. (1997) +1 other reference |
| Nordrum et al. (2006) | |
| Berge (n.d.) |
| Berge (n.d.) |
| Berge (n.d.) |
| Berge (n.d.) | |
| Berge (n.d.) |
| Berge (1993) | |
| Larsen et al. (1992) |
| Berge (n.d.) | |
| Berge (n.d.) | |
| Andersen (1993) | |
| Berge (n.d.) | |
| Berge (n.d.) |
| Berge (n.d.) | |
| Berge (n.d.) | |
| Berge (1993) |
| Berge (n.d.) +1 other reference |
| Berge (n.d.) | |
| Berge (n.d.) |
| Berge (n.d.) +1 other reference |
| Larsen (2015) |
| Nordrum (2007) | |
| Larsen et al. (2010) |
| Berge (n.d.) | |
| Berge (n.d.) | |
| Berge (n.d.) |
| Berge (n.d.) |
| Berge (n.d.) |
| Berge (n.d.) | |
| Berge et al. (2011) |
| Berge (n.d.) |
| Berge (2013) | |
| Larsen et al. (2010) | |
| Åsheim et al. (2008) | |
| Raade et al. (1980) | |
| Larsen et al. (2007) |
| Andersen et al. (1994) |
| Breivik (2018) |
| Berget (2006) |
| Rosenqvist (1957) |
Oman | |
| Rajendran et al. (2014) |
| |
Pacific Ocean | |
| Sun et al. (2026) |
| Escoube et al. (2015) | |
| Peretyazhko et al. (2024) |
| Peretyazhko et al. (2025) | |
| Peretyazhko et al. (2025) | |
| Fengyou Chu et al. (2006) |
Pakistan | |
| Singer et al. (2008) |
| Singer et al. (2008) |
| Laurs et al. (1998) +1 other reference |
| imported from Rondu District +1 other reference | |
Panama | |
| Byington +1 other reference |
Papua New Guinea | |
| Singer et al. (2008) |
| Rinne et al. (2018) |
| Rinne et al. (2018) | |
| Rinne et al. (2018) | |
| Petersen et al. (2002) |
| Singer et al. (2005) |
| Singer et al. (2008) |
Peru | |
| Imai et al. (1985) +1 other reference |
| Rainbow et al. (2005) |
| Bin Wu et al. (2013) |
| Gibson (1992) |
| Lewis (1964) |
| Pérez-Puig Obieta et al. (2013) |
| O'Connor et al. (2018) |
Philippines | |
| Jianmin Chen (2011) |
| Singer et al. (2008) |
| Singer et al. (2008) |
| Singer et al. (2008) |
| Singer et al. (2008) | |
| Singer et al. (2008) |
| Ignacio (2006) |
| Singer et al. (2008) |
Poland | |
| Krzysztof Andrzejewski Collection |
| Krzysztof Andrzejewski Collection |
| Krzysztof Andrzejewski Collection |
| Krzysztof Andrzejewski |
| Mochnacka K. 1975: Mineralizacja skał ... |
| Lis et al. (1986) | |
| Pendias H. (1961) |
| Krzysztof Andrzejewski |
| Krzysztof Andrzejewski |
| Krzysztof Andrzejewski |
| Lis et al. (1986) |
| Krzysztof Andrzejewski |
| Lis et al. (1986) | |
| Lis et al. (1986) | |
| Lis et al. (1986) | |
| Trippke P. (1878 a) |
| Krzysztof Andrzejewski |
| Sułkowski J. (1967) |
| Janeczek J. et al. (1991) |
| Szełęg et al. (2010) |
| Lis et al. (1986) |
| Lis et al. (1986) | |
| Collected by Krzysztof Andrzejewski |
| Krzysztof Andrzejewski Collection |
| Szopa et al. (2015) |
| Szeliga (2003) |
| Krzysztof Andrzejewski |
| Górniak et al. (2021) |
Portugal | |
| Marques de Sá et al. (2010) |
| Flahaut et al. (2018, September) |
| Oliveira et al. (2025) |
| Oliveira et al. (2025) |
| Silva et al. (2026) |
| Rui Nunes 23rd January 2009 | |
| Rui Nunes 2012 |
| Mineralien Atlas |
| International Geological Congress (2008) |
Romania | |
| Popa T. (2004) |
| Singer et al. (2008) |
| Slavoaca |
| Singer et al. (2008) |
| Ed.:Szakáll S.-Kristály ... |
| A. Januszewska PXRD data / Januszewska et al. (in preparation) |
| minerals-of-the-carpathians.eu (2008) |
| Onac et al. (2003) |
Russia | |
| Pekov et al. (2011) |
| Bailey (1980) |
| Talovina et al. (2008) |
| Mikhailov (2000) |
| Mashkovtsev et al. (2010) |
| Nikolaev et al. (2013) |
| Kalko et al. (2014) | |
| Volkov et al. (2011) | |
| Alekseev (2025) |
| Gurbanov et al. (2008) |
| Anastasiya SERGEEVA (2023) |
| Bortnikov et al. (2023) | |
| Pavel.M. Kartashov data. |
| Pavel M. Kartashov analytical data (1984) | |
| Active Volcanoes of Kamchatka |
| Okrugin (2004) | |
| Takahashi et al. (2002) +1 other reference | |
| Wanlie Ding (2005) |
| [var: Askanite] Kuleshov et al. (2002) | |
| Khomich et al. (2018) |
| Burlakov (1995) |
| Burlakov (1999) | |
| Boeva et al. (2023) |
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| PEKOV et al. (2013) |
| Pekov et al. (2004) | |
| ... | |
| Pekov et al. (2007) |
| Brusnitsyn et al. (2019) |
| Popov et al. (2014) |
| ... |
| Sharkov (2009) |
| Mikhailov (2000) |
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| Khetchikov +3 other references |
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| Hyršl (1992) |
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Saint Lucia | |
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Saudi Arabia | |
| Bello et al. (2026) |
Senegal | |
| www.uoguelph.ca (2003) |
Serbia | |
| RTB Bor |
| RTB Bor | |
| Zivanovic (2019) |
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| Malinko et al. (2004) |
Slovakia | |
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| Koděra et al. (1986) |
| Koděra et al. (1986) |
| |
| Kozák J. et al. (2017) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Ďuďa (1993) |
| Koděra et al. (1986) | |
| Koděra et al. (1986) | |
| Koděra et al. (1986) |
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| Pauliš | |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) | |
| Koděra et al. (1986) |
| Pauliš et al. (2002) | |
| Koděra et al. (1986) | |
| Pauliš et al. (2002) |
| Pauliš et al. (2002) |
| Koděra et al. (1986) | |
| Rusinová P. & Bačík P. (2013) |
| Koděra et al. (1986) |
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| Koděra et al. (1986) |
| Koděra et al. (1986) | |
| Koděra et al. (1986) |
| Koděra et al. (1986) | |
| Koděra et al. (1986) |
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| Koděra et al. (1986) |
| Ďuďa |
| Duda et. all. |
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| Duda et all. |
| Koděra et al. (1986) | |
| Koděra et al. (1986) |
| Ďuďa |
| Koděra et al. (1986) |
| Ďuďa |
| Duda et all. | |
| Koděra et al. (1986) |
| Pauliš |
Slovenia | |
| Žorž et al. (2002) |
South Africa | |
| Coetzee (1976) |
| Coetzee (1976) |
| Glass (2006) |
| Pers. comm. of company geologist to ... |
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South Korea | |
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Spain | |
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Sri Lanka | |
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Sweden | |
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| Bergström et al. (1982) |
| Bergström et al. (1982) |
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| |
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| Swedish Nat. Museum | |
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| Swedish Nat.Musuem |
| Swedish Nat.Musuem |
| Swedish Nat. Museum | |
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| Stalder et al. (1998) |
Taiwan | |
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| Yui et al. (1999) | |
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Tanzania | |
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Turkey | |
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| Yahya Çiftçi et al. (2013) +1 other reference |
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Turkmenistan | |
| Vladimir A. Maltsev (1993) +1 other reference |
UK | |
| Hall (1868) |
| Hall (1868) | |
| Collins (1878) +1 other reference |
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| Cook et al. (1982) |
| Cook et al. (1982) |
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| Cook et al. (1982) | |
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| Cook et al. (1982) | |
| Cook et al. (1982) |
| Cook et al. (1982) | |
| Cook et al. (1982) |
| Cook et al. (1982) | |
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| Cook et al. (1982) |
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| Galbraith et al. (1959) | |
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| Hinkley (1955) +1 other reference | |
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| Bollin & Kerr (1958) +1 other reference | |
| 118 +3 other references | |
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| Anthony et al. (1995) |
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| Howard (1987) +1 other reference | |
| Howard (2007) | |
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| Howard (2007) | |
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| White (1967) +2 other references |
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| Vikre et al. (2015) |
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| - (2005) +1 other reference |
| Benda (1960) +4 other references |
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| Ames et al. (1958) +1 other reference | |
| - (2005) |
| - (2005) |
| Wright et al. (1953) +2 other references |
| Todd et al. (1987) |
| Todd et al. (1987) | |
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| Sheppard (2008) +1 other reference | |
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| San Diego Mining Company | |
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| Foord et al. (1989) |
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| Pampeyan (2010) | |
| Pampeyan (2010) | |
| Pampeyan (2010) | |
| Pampeyan (2010) | |
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| Root (1925) +1 other reference |
| Kerr (1931) +2 other references |
| Kerr (1931) +3 other references | |
| Kerr (1931) +1 other reference | |
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| - (2005) | |
| - (2005) | |
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| Eckel et al. (1997) |
| Eckel et al. (1997) | |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) | |
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| Eckel et al. (1997) | |
| Eckel et al. (1997) | |
| Eckel et al. (1997) |
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| Eckel et al. (1997) | |
| Eckel et al. (1997) | |
| Eckel et al. (1997) |
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| Eckel et al. (1997) | |
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| Eckel et al. (1997) |
| Eckel et al. (1997) | |
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| Eckel et al. (1997) |
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| Zeitner (1968) | |
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| Olive et al. (1969) | |
| Olive et al. (1969) | |
| Olive et al. (1969) | |
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| Olive et al. (1969) | |
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| Wilson (1977) +1 other reference | |
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| King et al. (1994) +1 other reference | |
| King et al. (6) | |
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| King et al. (1994) +1 other reference | |
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| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) | |
| - (2005) |
| - (2005) |
| - (2005) | |
| - (2005) |
| Yale Peabody Museum |
| - (2005) | |
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| - (2005) | |
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| Gnanou (2018) |
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| Anaconda Mining Company Collection | |
| - (2005) |
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| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
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| Stephen B. Castor (1990) | |
| Castor et al. (2004) | |
| Gibson (1987) |
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| Leavitt et al. (2004) |
| Leavitt et al. (2004) | |
| USGS Open-File Report 76-56 +1 other reference |
| Castor et al. (2004) |
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| - (2005) |
| NBMG Bull 78 Geology and Mineral ... +1 other reference |
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| Econ Geol (1989) | |
| Econ Geol (1989) | |
| Econ Geol (1989) | |
| - (2005) |
| - (2005) |
| - (2005) | |
| - (2005) | |
| - (2005) | |
| - (2005) | |
| - (2005) |
| Cole et al. (1984) |
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| Newmont Mining Corporation |
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| - (2005) | |
| - (2005) | |
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| Barrick Gold Corporation | |
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| Castor et al. (2004) | |
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| Castor et al. (2004) |
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| Ken Coleman Collection | |
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| Vikre et al. (2015) | |
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| Castor et al. (2004) |
| - (2005) |
| Castor et al. (2004) | |
| - (2005) |
| Castor et al. (2004) |
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| Castor et al. (2004) +1 other reference | |
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| Jensen (1993) |
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| Johnson (1977) +1 other reference | |
| Johnson (1977) +1 other reference | |
| Johnson (1977) +1 other reference | |
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| Ken Coleman Collection | |
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| Rocks & Min.: 15: 124. |
| Peter Cristofono collection +1 other reference | |
| Smith (2005) |
| Rocks & Min.: 14:252. |
| Morrill (1960) +1 other reference | |
| Eric Quinter collection |
| Nora K. Foley et al. (2006) |
| Francis (1985) |
| Rocks & Min.:64:504. |
| Rumrill |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Moench (1962) | |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) | |
| - (2005) |
| Philip (2013) | |
| Northrop et al. (1996) |
| - (2005) | |
| - (2005) |
| - (2005) | |
| Northrop et al. (1996) | |
| Singer et al. (2008) |
| Northrop et al. (1996) | |
| Northrop et al. (1996) | |
| Northrop et al. (1996) | |
| NMBMMR Memoir 38 Geology and Technology ... |
| NMBMMR Memoir 38 Geology and Technology ... | |
| Northrop et al. (1996) | |
| Northrop et al. (1996) | |
| Northrop et al. (1996) |
| Elston (1968) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) | |
| Northrop et al. (1996) | |
| Northrop et al. (1996) | |
| Northrop et al. (1996) | |
| Northrop et al. (1996) |
| Northrop et al. (1996) | |
| - (2005) | |
| Jahns et al. (1977) |
| Northrop et al. (1996) | |
| Jensen (1978) |
| DeRudder & Beck 11th National ... |
| NY State Museum spec. no. 12921 |
| Chamberlain et al. (2023) |
| - (2005) |
| - (2005) | |
| - (2005) | |
| U.S Geological Survey +1 other reference | |
| Clays and Clay Minerals +1 other reference | |
| Smithsonian Institution Mineral ... |
| Heron et al. ( ) |
| Clays and Clay Minerals +1 other reference | |
| S.Duncan Heron ( ) | |
| S.Duncan Heron ( ) | |
| Mineral Resources On-Line Spatial Data ( MRDS) | |
| Wilson | |
| - (2005) |
| - (2005) |
| Dana et al. (1892) |
| S.Duncan Heron ( ) | |
| S.Duncan Heron ( ) | |
| Malcolm et al. (1969) | |
| vulcan.wr.usgs.gov (n.d.) |
| www.dmr.nd.gov (n.d.) |
| Leybourne et al. (2026) |
| - (2005) |
| Tschernich (1992) |
| - (2005) | |
| - (n.d.) |
| Marshall W. Gannett and Keith E. Bargar +1 other reference |
| USGS Bull 969 |
| - (2005) | |
| Nevada Bureau of Mines and Geology NBMG ... |
| Nevada Bureau of Mines and Geology NBMG ... |
| Altaner et al. (1990) | |
| Rocks & Minerals 81:229-234 |
| Lapham et al. (1965) |
| Cox (1985) +1 other reference |
| |
| Miller |
| Miller (1971) |
| Carr et al. (1981) +1 other reference |
| Metropolis et al. (1986) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| S.Duncan Heron ( ) | |
| S.Duncan Heron ( ) | |
| - (2005) |
| - (2005) |
| S.Duncan Heron ( ) | |
| - (2005) |
| Soil Sci Soc Am J 42:524-528 (1978) +1 other reference |
| Rocks & Minerals: 60: 117-118. |
| Roberts et al. (1965) |
| Roberts et al. (1965) | |
| Roberts et al. (1965) | |
| Rocks & Minerals: 67 (6) |
| Smith et al. (2000) | |
| Rock & Minerals Vol. 84 No. 4 Jul/Aug ... |
| Nandi et al. (2009) | |
| - (2010) | |
| Andrew R.Thomas and Haydn H. Murray (1989) | |
| Carmchael et al. (2017) |
| Olive et al. (1969) | |
| Nandi et al. (2009) | |
| Mineralogical Magazine 1979 43 : ... |
| Morgan et al. (2008) | |
| Marvin J. Droddy and John C. Butler (1979) |
| cms.lanl.gov (n.d.) | |
| Smith (1991) |
| Price (1983) | |
| Price (1983) |
| Am Min 72:1122-1130 |
| Smith (1991) |
| Smith (1991) |
| Dickinson et al. (1976) |
| Hubbard et al. (2023) |
| Anthony (1997) |
| - (2005) |
| - (2005) | |
| - (2005) | |
| - (2005) | |
| Price (1983) |
| Price (1983) | |
| Price (1983) | |
| Price (1983) | |
| Smith (1991) | |
| Min News 9:9 p6-8 |
| makalu.jpl.nasa.gov (n.d.) | |
| Young et al. (1960) |
| - (2005) |
| Williams (2017) |
| Bullock (1981) |
| - (2005) |
| Bullock (1981) |
| Bullock (1981) |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) | |
| Bullock (1981) |
| gsa.confex.com (n.d.) | |
| Wyant | |
| - (2005) +1 other reference | |
| Singer et al. (2008) |
| Bullock (1981) | |
| Bullock (1981) | |
| Meunier et al. (1987) |
| Finnell et al. (1963) | |
| Finnell et al. (1963) | |
| Gross (1956) |
| Chukanov et al. (2004) |
| Bullock (1981) |
| Bullock (1981) |
| Bullock (1981) | |
| - (2005) |
| Bullock (1981) |
| Bullock (1981) |
| Bullock (1981) +1 other reference |
| - (2005) | |
| Lovering et al. (1960) |
| - (2005) |
| - (2005) | |
| - (2005) | |
| - (2005) | |
| - (2005) | |
| - (2005) | |
| Singer et al. (2008) |
| Bullock (1981) | |
| Bullock (1981) |
| Am Min 50:231-235 +1 other reference |
| Dietrich (1990) |
| Dietrich (1990) | |
| Dietrich (1990) |
| Dietrich (1990) |
| Dietrich (1990) | |
| Dietrich (1985) |
| Dietrich (1990) | |
| Glass et al. (1958) +1 other reference | |
| Dietrich (1990) | |
| Tschernich (1992) |
| Singer et al. (2008) |
| Cannon (1991) |
| - (2005) |
| Barrington et al. (1961) +2 other references |
| Frank (1983) |
| Rocks & Min. Vol. 73 (1998) |
| Cordua (1998) | |
| Heyl et al. (1959) |
| DeMatties (2018) |
| 55TH INSTITUTE ON LAKE SUPERIOR GEOLOGY (2009) |
| Goodman (1978) | |
| Hanley et al. (1950) |
| - (2005) |
| - (2005) | |
| - (2005) | |
| Van Rythoven et al. (2020) |
| - (2005) |
| Coopersmith et al. (2003, June) |
| Hanley et al. (1950) |
| Fahey et al. (1941) |
| Bargar +1 other reference |
| Bargar et al. (1973) | |
| Tschernich (1992) | |
Uzbekistan | |
| Uklonskiy et al. (1964) +1 other reference |
| Solodov et al. (2001) |
| Mirzaev et al. (2004) |
Vietnam | |
| Gupta et al. (2005) |
Zambia | |
| MacIntyre (2019) |
| Brotherton (1979) |
Zimbabwe | |
| Meck et al. (2011) |
| Meck et al. (2011) |
| Mineralogical Magazine 1959 32 : 87-89 |
Mars | |
| Gornitz (2006) +1 other reference |
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Sanders-Defiance Plateau area, Apache County, Arizona, USA