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Chervetite

A valid IMA mineral species
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About ChervetiteHide

00156230015787910213174.jpg
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 IdentifiersHide

Mindat ID:
995
Long-form identifier:
mindat:1:1:995:5
GUID
(UUID V4):
c14f6fbf-5d08-4be2-8a5a-e8229150bd50

IMA Classification of ChervetiteHide

Classification of ChervetiteHide

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.
38.5.5.1

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
CrvIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of ChervetiteHide

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}
Density:
6.30 - 6.49 g/cm3 (Measured)    6.38 g/cm3 (Calculated)

Optical Data of ChervetiteHide

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.
Surface Relief:
Very High
Dispersion:
r > v very strong
Pleochroism:
Weak
Comments:
X == light brownish; Z == brownish.

Chemistry of ChervetiteHide

Mindat Formula:
Pb2(V2O7)

Crystallography of ChervetiteHide

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°
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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0012125ChervetiteKawahara A (1967) La structure cristalline de la chervetite Bulletin de la Societe Francaise de Mineralogie et de Cristallographie 90 279-2841967Mounana, Gabon0293
0019227ChervetiteShannon R D, Calvo C (1973) Refinement of the crystal structure of synthetic chervetite, Pb2V2O7 Canadian Journal of Chemistry 51 70-761973synthetic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47e : [Vanadates, chromates, manganates]
47h : [Near-surface oxidized, dehydrated minerals]

Type Occurrence of ChervetiteHide

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 ChervetiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
69 photos of Chervetite associated with FrancevilliteBa(UO2)2(VO4)2 · 5H2O
32 photos of Chervetite associated with CurienitePb(UO2)2(VO4)2 · 5H2O
27 photos of Chervetite associated with MounanaitePbFe3+2(VO4)2(OH,F)2
9 photos of Chervetite associated with ČechitePbFe2+(VO4)(OH)
2 photos of Chervetite associated with HedyphaneCa2Pb3(AsO4)3Cl
2 photos of Chervetite associated with Curienite-Francevillite Series
2 photos of Chervetite associated with VanuraliteAl(UO2)2(V2O8)(OH) · 11H2O
2 photos of Chervetite associated with MottramitePbCu(VO4)(OH)
1 photo of Chervetite associated with DuttoniteV4+O(OH)2

Related Minerals - Strunz-mindat GroupingHide

8.FA.AnastasenkoiteCaFe2+(P2O7)Tric. 1 : P1
8.FA.Phosphocyclite-(Fe)Fe2+2(P4O12)Mon. 2/m : B2/b
8.FA.Phosphocyclite-(Ni)Ni2(P4O12)Mon. 2/m : B2/b
8.FA.LisaniteCaNiP2O7Tric. 1 : P1
8.FA.ShasuiteCaNi3(P2O7)2Mon. 2/m : P21/b
8.FA.NabateaiteFe2P2O7Tric. 1 : P1
8.FA.SamraiteNi2P2O7Mon. 2/m : P21/b
8.FA.BakakiniteCa2V2O7Tric. 1 : P1
8.FA.05Blossiteα-Cu2(V2O7)Orth. mm2 : Fdd2
8.FA.10Ziesiteβ-Cu2(V2O7)Mon. 2/m : B2/b
8.FA.15UM1999-17:O:PbVPb4V2O9 or Pb4(VO4)2O
8.FA.20Pyrocoproite(K,Na)2Mg(P2O7)Mon.
8.FA.20PyrophosphiteK2Ca(P2O7)Mon.
8.FA.25Petewilliamsite(Ni,Co)30(As2O7)15Mon. 2 : B2

Other InformationHide

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 ChervetiteHide

References for ChervetiteHide

Localities for ChervetiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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.
Czech Republic
 
  • Central Bohemian Region
    • Příbram District
      • Vrančice
[Lapis 1995
J.Hyrsl (1992)
Gabon (TL)
 
  • Haut-Ogooué Province
    • Léboumbi-Leyou Department
      • Mounana
Bariand et al. (1963) +1 other reference
Germany
 
  • Lower Saxony
    • Goslar District
      • Braunlage
Russia
 
  • Republic of Karelia
    • Loukhsky District
      • Salla-Kuolajarvi belt
Koval et al. (2019)
USA
 
  • Michigan
    • Baraga County
      • Huron River
Carlson et al. (2007)
  • Nevada
    • Clark County
      • Spring Mountains
        • Goodsprings Mining District
Castor et al. (2004)
 
Mineral and/or Locality  
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