Chervetite
A valid IMA mineral species
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About Chervetite
Jean Chervet
Formula:
Pb2(V2O7)
Colour:
Gray to brown
Lustre:
Adamantine
Hardness:
2 - 2½
Specific Gravity:
6.30 - 6.49
Crystal System:
Monoclinic
Name:
Named in honor of Jean Chervet (31 August 1904, Nancy, France - 17 August 1962, France), mineralogist and director of the Mineralogy Service of the Atomic Energy Commission in France.
Unique Identifiers
Mindat ID:
995
Long-form identifier:
mindat:1:1:995:5
IMA Classification of Chervetite
Approved
IMA Formula:
Pb2+2V5+2O7
First published:
1963
Classification of Chervetite
8.FA.15
8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
A : Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
A : Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
38.5.5.1
38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
5 : Miscellaneous
38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
5 : Miscellaneous
21.3.9
21 : Vanadates (and vanadates with arsenate or phosphate)
3 : Vanadates of Al, rare earths, Pb, V or Bi
21 : Vanadates (and vanadates with arsenate or phosphate)
3 : Vanadates of Al, rare earths, Pb, V or Bi
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 |
|---|---|---|
| Crv | 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 Chervetite
Adamantine
Transparency:
Transparent
Colour:
Gray to brown
Streak:
White
Hardness:
2 - 2½ on Mohs scale
Comment:
Less than 3
Cleavage:
Distinct/Good
{100} and {010}
{100} and {010}
Density:
6.30 - 6.49 g/cm3 (Measured) 6.38 g/cm3 (Calculated)
Optical Data of Chervetite
Type:
Biaxial (-)
RI values:
nα = 2.250(8) nβ = 2.382(8) nγ = 2.410(8)
2V:
Measured: 50°
Max. Birefringence:
δ = 0.160
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
Dispersion:
r > v very strong
Pleochroism:
Weak
Comments:
X == light brownish; Z == brownish.
Chemistry of Chervetite
Mindat Formula:
Pb2(V2O7)
Element Weights:
Elements listed:
Crystallography of Chervetite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 13.3 Å, b = 7.14 Å, c = 7.08 Å
β = 106°
β = 106°
Ratio:
a:b:c = 1.863 : 1 : 0.992
Unit Cell V:
646.29 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Commonly twinned on {100}
contact twins or finely polysynthetic lamellae.
contact twins or finely polysynthetic lamellae.
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) |
|---|---|---|---|---|---|---|---|
| 0019227 | Chervetite | Shannon R D, Calvo C (1973) Refinement of the crystal structure of synthetic chervetite, Pb2V2O7 Canadian Journal of Chemistry 51 70-76 | 1973 | synthetic | 0 | 293 | |
| 0012125 | Chervetite | Kawahara A (1967) La structure cristalline de la chervetite Bulletin de la Societe Francaise de Mineralogie et de Cristallographie 90 279-284 | 1967 | Mounana, Gabon | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.93 Å | (F) |
| 4.32 Å | (mF) |
| 3.569 Å | (mF) |
| 3.441 Å | (FFF) |
| 3.428 Å | (FFF) |
| 3.206 Å | (FF) |
| 3.081 Å | (F) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47e : [Vanadates, chromates, manganates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Chervetite
General Appearance of Type Material:
Crystals from less than a mm to several cm, always twinned. Also as pseudomorphs after francevillite.
Place of Conservation of Type Material:
National School of Mines, Paris, France.
Geological Setting of Type Material:
Oxidation zone of uranium deposit
Associated Minerals at Type Locality:
Other Language Names for Chervetite
Common Associates
Associations Based on Photo Data:
| 73 photos of Chervetite associated with Francevillite | Ba(UO2)2(VO4)2 · 5H2O |
| 36 photos of Chervetite associated with Curienite | Pb(UO2)2(VO4)2 · 5H2O |
| 30 photos of Chervetite associated with Mounanaite | PbFe3+2(VO4)2(OH)2 |
| 9 photos of Chervetite associated with Čechite | PbFe2+(VO4)(OH) |
| 2 photos of Chervetite associated with 'Curienite-Francevillite Series' | |
| 2 photos of Chervetite associated with Hedyphane | Ca2Pb3(AsO4)3Cl |
| 2 photos of Chervetite associated with Vanuralite | Al(UO2)2(V2O8)(OH) · 11H2O |
| 2 photos of Chervetite associated with Mottramite | PbCu(VO4)(OH) |
| 1 photo of Chervetite associated with Anglesite | PbSO4 |
| 1 photo of Chervetite associated with Duttonite | V4+O(OH)2 |
Related Minerals - Strunz-mindat Grouping
| 8.FA. | Phosphocyclite-(Fe) | Fe2+2(P4O12) |
| 8.FA. | Phosphocyclite-(Ni) | Ni2(P4O12) |
| 8.FA. | Grahampearsonite | Ca2P2O7 |
| 8.FA. | Bakakinite | Ca2V2O7 |
| 8.FA. | Lisanite | CaNiP2O7 |
| 8.FA. | Shasuite | CaNi3(P2O7)2 |
| 8.FA. | Nabateaite | Fe2P2O7 |
| 8.FA. | Samraite | Ni2P2O7 |
| 8.FA. | Anastasenkoite | CaFe2+(P2O7) |
| 8.FA.05 | Blossite | α-Cu2(V2O7) |
| 8.FA.10 | Ziesite | β-Cu2(V2O7) |
| 8.FA.15 | 'UM1999-17:O:PbV' | Pb4V2O9 or Pb4(VO4)2O |
| 8.FA.20 | Yamhamelachite | KCrP2O7 |
| 8.FA.20 | 'Pyrocoproite' | (K,Na)2Mg(P2O7) |
| 8.FA.20 | 'Pyrophosphite' | K2Ca(P2O7) |
| 8.FA.25 | Petewilliamsite | (Ni,Co)30(As2O7)15 |
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 Chervetite
mindat.org URL:
https://www.mindat.org/min-995.html
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Please feel free to link to this page.
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References for Chervetite
Reference List:
Bariand, Pierre; Chantret, Francis; Pouget, R.; Rimsky, Alexandre (1963) Une nouvelle espèce minérale : la chervetite, pyrovanadate de plomb Pb2V2O7. Bulletin de la Société française de Minéralogie et de Cristallographie, 86 (2). 117-120 doi:10.3406/bulmi.1963.5629
Bariand, Pierre; Chantret, Francis; Pouget, R.; Rimsky, Alexandre (1963) Une nouvelle espèce minérale : la chervetite, pyrovanadate de plomb Pb2V2O7. Bulletin de la Société française de Minéralogie et de Cristallographie, 86 (2). 117-120 doi:10.3406/bulmi.1963.5629
Cesbron, Fabien (1965) Données nouvelles sur la chervétite. Bulletin de Minéralogie, 88 (1) 126-129 doi:10.3406/bulmi.1965.5813
Kawahara, Akira (1967) La structure cristalline de la chervétite. Bulletin de Minéralogie, 90 (3) 279-284 doi:10.3406/bulmi.1967.6123
IMA (1967) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (277) 131-136 doi:10.1180/minmag.1967.036.277.20
Shannon, Robert D., Calvo, Crispin (1973) Refinement of the Crystal Structure of Synthetic Chervetite, Pb2V2O7. Canadian Journal of Chemistry, 51 (1). 70-76 doi:10.1139/v73-010
Localities for Chervetite
Showing 9 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.
Czech Republic | |
| Kohout et al. (1995) +1 other reference |
| J.Hyrsl (1992) | |
Gabon (TL) | |
| Bariand et al. (1963) +1 other reference |
Germany | |
| Schnorrer-Köhler et al. (1989) |
Russia | |
| Koval et al. (2019) |
USA | |
| Carnegie Museum of Natural History ... |
| Carlson et al. (2007) |
| Castor et al. (2004) |
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Mounana Mine, Mounana, Léboumbi-Leyou Department, Haut-Ogooué Province, Gabon