Chervetite
A valid IMA mineral species
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About Chervetite
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
GUID
(UUID V4):
(UUID V4):
c14f6fbf-5d08-4be2-8a5a-e8229150bd50
IMA Classification of Chervetite
Approved
IMA Formula:
Pb2V5+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 |
---|---|---|
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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v very strong
Pleochroism:
Weak
Comments:
X == light brownish; Z == brownish.
Chemistry of Chervetite
Mindat Formula:
Pb2(V2O7)
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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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
---|---|---|---|---|---|---|---|
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 | |
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 |
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:
Reference:
Bariand, P., Chantret, F., Pouget, R. and Rimsky, A. (1963) Une nouvelle éspèce minérale: la chervetite, pyrovanadate de plomb Pb2V2O7. Bulletin de la Société Française de Minéralogie et de Cristallographie: 86: 117-120.
Other Language Names for Chervetite
Common Associates
Associated Minerals Based on Photo Data:
69 photos of Chervetite associated with Francevillite | Ba(UO2)2(VO4)2 · 5H2O |
32 photos of Chervetite associated with Curienite | Pb(UO2)2(VO4)2 · 5H2O |
27 photos of Chervetite associated with Mounanaite | PbFe3+2(VO4)2(OH,F)2 |
9 photos of Chervetite associated with Čechite | PbFe2+(VO4)(OH) |
2 photos of Chervetite associated with Hedyphane | Ca2Pb3(AsO4)3Cl |
2 photos of Chervetite associated with Curienite-Francevillite Series | |
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 Duttonite | V4+O(OH)2 |
Related Minerals - Strunz-mindat Grouping
8.FA. | Anastasenkoite | CaFe2+(P2O7) |
8.FA. | Phosphocyclite-(Fe) | Fe2+2(P4O12) |
8.FA. | Phosphocyclite-(Ni) | Ni2(P4O12) |
8.FA. | Lisanite | CaNiP2O7 |
8.FA. | Shasuite | CaNi3(P2O7)2 |
8.FA. | Nabateaite | Fe2P2O7 |
8.FA. | Samraite | Ni2P2O7 |
8.FA. | Bakakinite | Ca2V2O7 |
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 | 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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References for Chervetite
Localities for Chervetite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| [Lapis 1995 |
J.Hyrsl (1992) | |
Gabon (TL) | |
| Bariand et al. (1963) +1 other reference |
Germany | |
| |
Russia | |
| Koval et al. (2019) |
USA | |
| Carlson et al. (2007) |
| Castor et al. (2004) |
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Mounana Mine, Mounana, Léboumbi-Leyou Department, Haut-Ogooué Province, Gabon