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Natrodufrénite
A valid IMA mineral species
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About Natrodufrénite
Formula:
NaFe3+Fe3+5(PO4)4O(OH)5(H2O)2
Colour:
Greenish brown
Hardness:
3½ - 4½
Specific Gravity:
3.20
Crystal System:
Monoclinic
Member of:
Name:
For being the Na analogue of dufrénite.
Isostructural with:
Name Encoding
ASCII-7:
Natrodufrenite
Unique Identifiers
Mindat ID:
2854
Long-form identifier:
mindat:1:1:2854:3
IMA Classification of Natrodufrénite
Approved
IMA status notes:
Redefined by the IMA
Approval year:
1981
First published:
1982
Approval history:
IMA 25-F –Redefinition of natrodufrénite
Classification of Natrodufrénite
8.DK.15
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
42.9.1.3
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
19.14.6
19 : Phosphates
14 : Phosphates of Fe and other metals
19 : Phosphates
14 : Phosphates of Fe and other metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ndf | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Natrodufrénite
Transparency:
Translucent
Colour:
Greenish brown
Streak:
Green
Hardness:
3½ - 4½ on Mohs scale
Tenacity:
Brittle
Density:
3.20(3) g/cm3 (Measured) 3.23 g/cm3 (Calculated)
Optical Data of Natrodufrénite
Type:
Biaxial (+)
RI values:
nα = 1.756 nγ = 1.775
Max. Birefringence:
δ = 0.019
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:
Very High (positive)
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.
No measured or calculated 2V is on file for this mineral, so the value used here (90°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
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.
No measured or calculated 2V is on file for this mineral, so the value used here (90°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Dispersion:
distinct to strong
Pleochroism:
Visible
Comments:
X = pale yellow; Z = dark green.
Chemistry of Natrodufrénite
Mindat Formula:
NaFe3+Fe3+5(PO4)4O(OH)5(H2O)2
Element Weights:
Crystallography of Natrodufrénite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 25.83(2) Å, b = 5.150(3) Å, c = 13.772(9) Å
β = 111.53°
β = 111.53°
Ratio:
a:b:c = 5.016 : 1 : 2.674
Unit Cell V:
1,704.19 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Radially fibrous spherulites, to 5 mm, may be in warty nodules.
Comment:
By analogy to dufrénite.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.04 Å | (80) |
| 5.040 Å | (60) |
| 4.124 Å | (50) |
| 3.400 Å | (80) |
| 3.204 Å | (80) |
| 3.152 Å | (100) |
| 2.989 Å | (50) |
Comments:
Close to dufrénite.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Natrodufrénite
General Appearance of Type Material:
Blue-green spheres of compact radiating fibers up to 0.5 cm in diameter.
Place of Conservation of Type Material:
Natural History Museum, Paris, France, 106384, 106385.
National School of Mines, Paris, France, 18329.
National School of Mines, Paris, France, 18329.
Geological Setting of Type Material:
Limonitic ore bed; formed by low temperature, supergene alteration.
Associated Minerals at Type Locality:
Synonyms of Natrodufrénite
Other Language Names for Natrodufrénite
Relationship of Natrodufrénite to other Species
Member of:
Other Members of Dufrénite Group:
| Bimbowrieite | NaMgFe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Burangaite | NaFe2+Al5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Gayite | NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
| Matioliite | NaMgAl5(PO4)4(OH)6 · 2H2O | Mon. 2/m : B2/b |
Common Associates
Associations Based on Photo Data:
| 27 photos of Natrodufrénite associated with Cyrilovite | NaFe3+3(PO4)2(OH)4 · 2H2O |
| 22 photos of Natrodufrénite associated with Kidwellite | NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33 |
| 18 photos of Natrodufrénite associated with Strengite | FePO4 · 2H2O |
| 15 photos of Natrodufrénite associated with Leucophosphite | KFe3+2(PO4)2(OH) · 2H2O |
| 10 photos of Natrodufrénite associated with Cacoxenite | Fe3+24AlO6(PO4)17(OH)12 · 75H2O |
| 8 photos of Natrodufrénite associated with Quartz | SiO2 |
| 7 photos of Natrodufrénite associated with Wavellite | Al3(PO4)2(OH)3 · 5H2O |
| 6 photos of Natrodufrénite associated with Kapundaite | NaCaFe4(PO4)4(OH)3 · 5H2O |
| 4 photos of Natrodufrénite associated with Kintoreite | PbFe3(PO4)(PO3OH)(OH)6 |
| 3 photos of Natrodufrénite associated with Goethite | Fe3+O(OH) |
Related Minerals - Strunz-mindat Grouping
| 8.DK. | Regerite | KFe6(PO4)4(OH)7(H2O)6 · 4H2O |
| 8.DK. | Richelsdorfite | Ca2Cu5Sb(AsO4)4(OH)6Cl · 6H2O |
| 8.DK. | Bimbowrieite | NaMgFe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK. | Puttapaite | Pb2Mn2+2ZnCr3+4O2(AsO4)4(OH)6 · 12H2O |
| 8.DK.10 | Thalliumpharmacosiderite | TlFe3+4[(AsO4)3(OH)4] · 4H2O |
| 8.DK.10 | Natropharmacosiderite | NaFe3+4(AsO4)3(OH)4 · 4H2O |
| 8.DK.10 | Pharmacosiderite | KFe3+4(AsO4)3(OH)4 · 6-7H2O |
| 8.DK.10 | Plumbopharmacosiderite | Pb0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
| 8.DK.10 | Strontiopharmacosiderite | Sr0.5Fe3+4[(AsO4)3(OH)4] · 4H2O |
| 8.DK.10 | Bariopharmacosiderite | Ba0.5Fe3+4(AsO4)3(OH)4 · 5H2O |
| 8.DK.10 | Hydroniumpharmacosiderite | (H3O)Fe3+4(AsO4)3(OH)4 · 4H2O |
| 8.DK.12 | Hydroniumpharmacoalumite | (H3O)Al4(AsO4)3(OH)4 · 4.5H2O |
| 8.DK.12 | Bariopharmacoalumite | Ba0.5Al4(AsO4)3(OH)4 · 4H2O |
| 8.DK.12 | Pharmacoalumite | KAl4(AsO4)3(OH)4 · 6.5H2O |
| 8.DK.12 | Calciopharmacoalumite | Ca0.5Al4(AsO4)3(OH)4 · 5H2O |
| 8.DK.12 | Natropharmacoalumite | NaAl4(AsO4)3(OH)4 · 4H2O |
| 8.DK.15 | Matioliite | NaMgAl5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Burangaite | NaFe2+Al5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Dufrénite | Ca0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK.15 | Gayite | NaMn2+Fe3+5(PO4)4(OH)6 · 2H2O |
| 8.DK.20 | Kidwellite | NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33 |
| 8.DK.25 | Bleasdaleite | (Ca,Fe3+)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13 |
| 8.DK.30 | Matulaite | (Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O |
| 8.DK.35 | Krasnovite | Ba(Al,Mg)(PO4,CO3)(OH)2 · H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Natrodufrénite
mindat.org URL:
https://www.mindat.org/min-2854.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Natrodufrénite
Reference List:
Fontan, François, Pillard, François, Permingeat, François (1982) La natrodufrénite (Na, ⃞)(Fe+++, Fe++)(Fe+++, Al) 5 (PO4) 4 (OH) 6• 2H2O, une nouvelle espèce minérale du groupe de la dufrénite. Bulletin de Minéralogie, 105 (4). 321-326 doi:10.3406/bulmi.1982.7623
Dunn, P.J.; Grice, J.D.; Fleischer, M.; Pabst, A. (1983) New mineral names. American Mineralogist, 68 (9-10). 1038-1041
Roda-Robles, Encarnación, Fontan, François, Pesquera Pérez, Alfonso, Keller, Paul (1998) The Fe-Mn phosphate associations from the Pinilla de Fermoselle pegmatite, Zamora, Spain: occurrence of kryzhanovskite and natrodufrénite. European Journal of Mineralogy, 10 (1) 155-168 doi:10.1127/ejm/10/1/0155
Localities for Natrodufrénite
Showing 65 localities.
symbol to view information about a locality.
The 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.
Argentina | |
| Kampf et al. (2010) |
Australia | |
| Birch et al. (1997) |
| Day (1998) | |
| Day et al. (1996) |
| Derrick |
| Peter Elliott |
| Vince Peisley specimen |
| |
| Peter Elliott |
| - (1997, December) |
| Elliott et al. (2025) |
| ID by Peter Elliott - South Australia ... |
| - (1997, December) |
| Peter Elliott |
| |
| P. Sutton (2007) |
| Birch (1996) |
Austria | |
| Brandstätter et al. (1990) +1 other reference |
Brazil | |
| Sergio Varvello collection |
| Sergio Varvello collection |
Chile | |
| XRD by Gerhard Möhn |
| maurizio dini collection - analysed ... |
| Codelco |
| Teck Resources Limited |
Czech Republic | |
| Sejkora et al. (2006) |
| Sejkora et al. (2006) | |
| Sejkora et al. (2007) |
| Škoda |
| Vrtiška et al. (with English summary) |
| Sejkora et al. (2011) |
| Vrtiška et al. (2017) |
| Škoda et al. (2007) +1 other reference |
France | |
| Yannick Vessely collection - SEM-EDS ... |
| Uwe Kolitsch (SXRD + SEM-EDS) |
| Boisson et al. (2000) +1 other reference | |
| Pierre Le Roch & Jean-Marc Johannet ... |
| Bull.Mineral. (1982) |
| Jean-Marc Johannet collection (unpublished SEM-EDS analyses by Vincent Bourgouin) |
| Gayraud et al. (2011) +1 other reference |
Germany | |
| Collected by Hans-Peter Maaßen +1 other reference |
| Dill et al. (2012) |
| Gerhard Möhn Collection. Identified by ... |
| Blaß (2002) |
| Hucko (2010) |
| SEM-EDS |
| Wittern (2001) |
Hungary | |
| collector: Regina Körmendy |
Italy | |
| collected by F. Castellaro and probed ... |
| Bruno Marello collection | |
| Marco Ciriotti 2010 | |
| Gianluca Armellino et al. (2024) +1 other reference | |
Morocco | |
| Favreau (2012) |
Portugal | |
| Alves (n.d.) |
| Identified in Rebentão Mine |
| Nuno Afonso collection |
Spain | |
| www.foro-minerales.com (2022) |
| www.foro-minerales.com (2022) +1 other reference | |
| Christian Rewitzer collection |
| Roda-Robles et al. (1998) |
| Calvo et al. (2011) |
USA | |
| Henry Barwood |
| Henry Barwood | |
| Grant et al. (2005) |
| Silver Coin Mine. Compact Disc. Paul ... |
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Fragas da Carvalhosa Mine, Felgar e Souto da Velha, Torre de Moncorvo, Bragança, Portugal