Péligotite
A valid IMA mineral species
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About Péligotite
Eugène-Melchior Péligot
Formula:
Na6(UO2)(SO4)4 · 4H2O
Colour:
Yellowish green to greenish-yellow
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
2.88
Crystal System:
Triclinic
Name:
To honour Eugène-Melchior Péligot (24 March 1811 in Paris – 15 April 1890 in Paris), French chemist credited for isolation of the first sample of metallic uranium.
Dimorph of:
Related to ottohahnite.
Also chemically similar to fermiite and oppenheimerite; further, lesser similarity with sulfate-hydrosulfates belakovskiite and meisserite, and basic sulfates plášilite and natrozippeite.
Found together with klaprothite and ottohahnite; these three minerals are very similar in terms of physical and chemical properties (colour, fracture, hardness, water solubility, fluorescence).
The structure is similar to that of klaprothite and comprises [(UO2)(SO4)4]6– clusters, with one of the sulphate tetrahedra being doubly (bidentate) linked to UO7 polyhedron; Na-O polyhedra provide two types of linkages: (1) for the clusters, to give thick heteropolyhedral layers, and (2) between the layers, to form the framework. The structural difference between the two minerals lies in the layer-linking Na-O polyhedra.
Also chemically similar to fermiite and oppenheimerite; further, lesser similarity with sulfate-hydrosulfates belakovskiite and meisserite, and basic sulfates plášilite and natrozippeite.
Found together with klaprothite and ottohahnite; these three minerals are very similar in terms of physical and chemical properties (colour, fracture, hardness, water solubility, fluorescence).
The structure is similar to that of klaprothite and comprises [(UO2)(SO4)4]6– clusters, with one of the sulphate tetrahedra being doubly (bidentate) linked to UO7 polyhedron; Na-O polyhedra provide two types of linkages: (1) for the clusters, to give thick heteropolyhedral layers, and (2) between the layers, to form the framework. The structural difference between the two minerals lies in the layer-linking Na-O polyhedra.
Name Encoding
ASCII-7:
Peligotite
Unique Identifiers
Mindat ID:
46970
Long-form identifier:
mindat:1:1:46970:4
IMA Classification of Péligotite
Approved
IMA Formula:
Na6(U6+O2)(S6+O4)4·4H2O
Approval year:
2015
First published:
2017
Type description reference:
Kampf, Anthony R., Plášil, Jakub, Kasatkin, Anatoly V., Marty, Joe, Čejka, Jiří (2017) Klaprothite, péligotite and ottohahnite, three new minerals with bidentate UO7–SO4 linkages from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 81 (4) 753-779 doi:10.1180/minmag.2016.080.120
Classification of Péligotite
7.EC.65
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
C : With medium-sized and large cations
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 |
|---|---|---|
| Pél | 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 Péligotite
Vitreous
Transparency:
Transparent
Colour:
Yellowish green to greenish-yellow
Hardness:
2½ on Mohs scale
Comment:
ca. 2.5
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.88(2) g/cm3 (Measured) 2.878 g/cm3 (Calculated)
Comment:
Calculated value is based on empirical formula
Optical Data of Péligotite
Type:
Biaxial (-)
RI values:
nα = 1.493(1) nβ = 1.511(1) nγ = 1.515(1)
2V:
Measured: 50° (1), Calculated: 50.0°
Max. Birefringence:
δ = 0.022
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:
Moderate (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:
r>v, distinct
Optical Extinction:
X ∧ c= 3°; Y ∧ b= 43°; Z ∧ a= 40°.
Pleochroism:
Visible
Comments:
X = colourless, Y = light yellowish green, Z = light yellowish green.
Comments:
X < Y ≈ Z.
Chemistry of Péligotite
Mindat Formula:
Na6(UO2)(SO4)4 · 4H2O
Element Weights:
Crystallography of Péligotite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 9.81511(18) Å, b = 9.9575(2) Å, c = 10.6289(8) Å
α = 88.680(6)°, β = 73.990(5)°, γ = 89.205(6)°
α = 88.680(6)°, β = 73.990(5)°, γ = 89.205(6)°
Ratio:
a:b:c = 0.986 : 1 : 1.067
Unit Cell V:
998.22 ų
Z:
2
Morphology:
{001}, {110} and {110}
Twinning:
No twinning observed in type material.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.19 Å | (39) |
| 9.51 Å | (48) |
| 7.11 Å | (100) |
| 5.14 Å | (63) |
| 4.54 Å | (43) |
| 4.307 Å | (53) |
| 3.418 Å | (73) |
| 3.121 Å | (74) |
Reference:
Kampf, Anthony R., Plášil, Jakub, Kasatkin, Anatoly V., Marty, Joe, Čejka, Jiří (2017) Klaprothite, péligotite and ottohahnite, three new minerals with bidentate UO7–SO4 linkages from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 81 (4) 753-779 doi:10.1180/minmag.2016.080.120
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47f : [Uranyl (U⁶⁺) minerals] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Péligotite
General Appearance of Type Material:
Equant rhombs up to ∼0.5 mm, but usually much smaller. Crystal faces often concave with rounded edges. Crystals typically occur in subparallel aggregates and drusy intergrowths.
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 65610, 65614, 65615 and 65616, and the Fersman Mineralogical Museum of the Russian Academy of Sciences.
Associated Minerals at Type Locality:
Reference:
Kampf, Anthony R., Plášil, Jakub, Kasatkin, Anatoly V., Marty, Joe, Čejka, Jiří (2017) Klaprothite, péligotite and ottohahnite, three new minerals with bidentate UO7–SO4 linkages from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 81 (4) 753-779 doi:10.1180/minmag.2016.080.120
Synonyms of Péligotite
Other Language Names for Péligotite
Dutch:Péligotiet
German:Péligotit
Related Minerals - Strunz-mindat Grouping
| 7.EC. | Nitscheite | (NH4)2[(UO2)2(SO4)3(H2O)2] · 3H2O |
| 7.EC. | Beshtauite | (NH4)2(UO2)(SO4)2 · 2H2O |
| 7.EC. | Oldsite-(K) | K2Fe2+[(UO2)(SO4)2]2(H2O)8 |
| 7.EC. | Adolfpateraite | K(UO2)(SO4)(OH)(H2O) |
| 7.EC. | Libbyite | (NH4)2(Na2◻)[(UO2)2(SO4)3(H2O)]2 · 7H2O |
| 7.EC. | Seaborgite | LiK2Na6(UO2)(SO4)5(SO3OH)(H2O) |
| 7.EC.05 | Zinczippeite | Zn(UO2)2(SO4)O2 · 3.5H2O |
| 7.EC.05 | Zippeite | K3(UO2)4(SO4)2O3(OH) · 3H2O |
| 7.EC.05 | Cobaltzippeite | Co(UO2)2(SO4)O2 · 3.5H2O |
| 7.EC.05 | Nickelzippeite | Ni2(UO2)6(SO4)3(OH)10 · 16H2O |
| 7.EC.05 | Redcanyonite | (NH4)2Mn[(UO2)4O4(SO4)2](H2O)4 |
| 7.EC.05 | Natrozippeite | Na5(UO2)8(SO4)4O5(OH)3 · 12H2O |
| 7.EC.05 | Magnesiozippeite | Mg(UO2)2(SO4)O2 · 3.5H2O |
| 7.EC.05 | Ammoniozippeite | (NH4)2[(UO2)2(SO4)O2] · H2O |
| 7.EC.05 | Plavnoite | K0.8Mn0.6[(UO2)2O2(SO4)] · 3.5H2O |
| 7.EC.10 | Rabejacite | Ca(UO2)4(SO4)2(OH)6 · 6H2O |
| 7.EC.10 | Svornostite-(NH4) | (NH4)2Mg(UO2)2(SO4)4(H2O)8 |
| 7.EC.10 | Svornostite-(K) | K2Mg[(UO2)(SO4)2]2(H2O)8 |
| 7.EC.15 | Sejkoraite-(Y) | Y2(UO2)8(SO4)4O6(OH)2 · 26H2O |
| 7.EC.15 | Marécottite | Mg3(UO2)8(SO4)4O6(OH)2 · 28H2O |
| 7.EC.15 | Hubbardite | Mg(H2O)6[(UO2)2O(OH)(SO4)]2 · 8H2O |
| 7.EC.20 | Pseudojohannite | Cu3(UO2)4(SO4)2O4(OH)2 · 12H2O |
| 7.EC.40 | Bluelizardite | Na7(UO2)(SO4)4Cl(H2O)2 |
| 7.EC.45 | Meisserite | Na5(UO2)(SO4)3(SO3OH)(H2O) |
| 7.EC.45 | Fermiite | Na4(UO2)(SO4)3 · 3H2O |
| 7.EC.45 | Oppenheimerite | Na2(UO2)(SO4)2 · 3H2O |
| 7.EC.50 | Feynmanite | Na(UO2)(SO4)(OH) · 3.5H2O |
| 7.EC.50 | Plášilite | Na(UO2)(SO4)(OH) · 2H2O |
| 7.EC.55 | Geschieberite | K2(UO2)(SO4)2 · 2H2O |
| 7.EC.60 | Ottohahnite | Na6(UO2)2(SO4)5(H2O)7 · 1.5H2O |
| 7.EC.70 | Klaprothite | Na6(UO2)(SO4)4 · 4H2O |
| 7.EC.75 | Lussierite | Na10[(UO2)(SO4)4](SO4)2 · 3(H2O) |
| 7.EC.80 | Navrotskyite | K2Na10(UO2)3(SO4)9 · 2H2O |
| 7.EC.85 | Pseudomeisserite-(NH4) | (NH4)2Na4[(UO2)2(SO4)5] · 4H2O |
| 7.EC.90 | Wetherillite | Na2Mg(UO2)2(SO4)4 · 18H2O |
Radioactivity
Radioactivity:
| Element | % Content | Activity (Bq/kg) | Radiation Type |
|---|---|---|---|
| Uranium (U) | 27.5408% | 6,885,200 | α, β, γ |
| Thorium (Th) | 0.0000% | 0 | α, β, γ |
| Potassium (K) | 0.0000% | 0 | β, γ |
For comparison:
- Banana: ~15 Bq per fruit
- Granite: 1,000–3,000 Bq/kg
- EU exemption limit: 10,000 Bq/kg
Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.
Interactive Simulator:
Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!
Activity: –
| Distance | Dose rate | Risk |
|---|---|---|
| 1 cm | ||
| 10 cm | ||
| 1 m |
The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).
D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield
Fluorescence of Péligotite
Bright bluish-green under both longwave and shortwave ultraviolet light.
Other Information
Notes:
Easily soluble in RT water; Raman spectrum is given as is similar to that of klaprothite and ottohahnite.
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 Péligotite
mindat.org URL:
https://www.mindat.org/min-46970.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 Péligotite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2015 and 2016, CNMNC Newsletter No 29. Mineralogical Magazine, 80 (1) 199-205 doi:10.1180/minmag.2016.080.080
Kampf, Anthony R., Plášil, Jakub, Kasatkin, Anatoly V., Marty, Joe, Čejka, Jiří (2017) Klaprothite, péligotite and ottohahnite, three new minerals with bidentate UO7–SO4 linkages from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 81 (4) 753-779 doi:10.1180/minmag.2016.080.120
Kampf, Anthony R., Plášil, Jakub, Kasatkin, Anatoly V., Marty, Joe, Čejka, Jiří (2017) Klaprothite, péligotite and ottohahnite, three new minerals with bidentate UO7–SO4 linkages from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 81 (4) 753-779 doi:10.1180/minmag.2016.080.120
Localities for Péligotite
Showing 1 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.
USA (TL) | |
| Kampf et al. (2017) |
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Blue Lizard Mine, Red Canyon Mining District, San Juan County, Utah, USA