Mineralogy Database

Chervetite Mineral Data

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General Chervetite Information

Help on Chemical  Formula: Chemical Formula: Pb2V2O7
Help on Composition: Composition: Molecular Weight = 628.28 gm
   Vanadium  16.22 %  V    28.95 % V2O5
   Lead      65.96 %  Pb   71.05 % PbO
   Oxygen    17.83 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb2V5+2O7
Help on Environment: Environment: Oxidized zone of a vanadium- and lead-bearing uranium deposit.
Help on IMA Status: IMA Status: Approved IMA 1963
Help on Locality: Locality: Mounana uranium mine, Franceville, Gabon. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Jean Chervet, French mineralogist.
Help on Name Pronunciation: Name Pronunciation: Chervetite + Pronunciation Say CHERVETITE
Help on Synonym: Synonym: ICSD 2901
  PDF 47-1735

Chervetite Image

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  Chervetite   Francevillite

Comments: Bottle brown tabular crystals of chervetite on yellow francevilleite.
Location: Mounana, Haut-Ogoue, Gabon. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Chervetite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.8401:1:0.9494
Help on Cell Dimensions: Cell Dimensions: a = 13.47, b = 7.32, c = 6.95, Z = 4; beta = 107.417° V = 653.85 Den(Calc)= 6.38
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.428(1), 3.441(1), 3.206(0.8),

Physical Properties of Chervetite

Help on Cleavage: Cleavage: {100} Indistinct
Help on Color: Color: Brown, Colorless, Gray.
Help on Density: Density: 6.3 - 6.49, Average = 6.39
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Chervetite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.135 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.137 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2194,KPDmeas= 0.2189,KC= 0.1929
Ncalc = 2.22 - 2.25
Help on Optical Data: Optical Data: Biaxial (-), b=2.2-2.6, 2V(Meas)=65-75.

Calculated Properties of Chervetite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.42 gm/cc
note: Specific Gravity of Chervetite =6.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PEChervetite =1,199.27 barns/electron
U=PEChervetite x rElectron Density=6,494.08 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chervetite is Not Radioactive

Chervetite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.05)with miscellaneous formulae
  (38.05.05)Dana Group Chervetite Pb2V2O7 P 21/a 2/m Ziesite Cu2V2O7 A2/a 2/m
Help on  Strunz Class: Strunz Class: 08.FA.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.F - Polyphosphates, Polyarsenates, [4]-Polyvanadates
  08.FA -Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
08.FA.15 Chervetite Pb2V2O7 P 21/a 2/m

Other Chervetite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Chervetite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 08.FA.15





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