Chervetite Mineral Data
General Chervetite Information
Chemical Formula:
Pb2V2O7
Composition:
Molecular Weight = 628.28 gm
Vanadium 16.22 % V 28.95 % V2 O5
Lead 65.96 % Pb 71.05 % PbO
Oxygen 17.83 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Pb2 V5+ 2 O7
Environment:
Oxidized zone of a vanadium- and lead-bearing uranium deposit.
IMA Status:
Approved IMA 1963
Locality:
Mounana uranium mine, Franceville, Gabon. Link to MinDat.org Location Data.
Name Origin:
Named for Jean Chervet, French mineralogist.
Name Pronunciation:
Chervetite + Pronunciation
Synonym:
ICSD 2901
PDF 47-1735
Chervetite Image
Images:
Chervetite Crystallography
Axial Ratios:
a:b:c =1.8401:1:0.9494
Cell Dimensions:
a = 13.47, b = 7.32, c = 6.95, Z = 4; beta = 107.417° V = 653.85 Den(Calc)= 6.38
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21 /a
X Ray Diffraction:
By Intensity(I/Io ): 3.428(1), 3.441(1), 3.206(0.8),
Physical Properties of Chervetite
Cleavage:
{100} Indistinct
Color:
Brown, Colorless, Gray.
Density:
6.3 - 6.49, Average = 6.39
Diaphaneity:
Transparent to Translucent
Hardness:
2-2.5 - Gypsum-Finger Nail
Luster:
Adamantine
Streak:
white
Optical Properties of Chervetite
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
Optical Data:
Biaxial (-), b=2.2-2.6, 2V(Meas)=65-75.
Calculated Properties of Chervetite
Electron Density:
Bulk Density (Electron Density)=5.42 gm/cc note: Specific Gravity of Chervetite =6.40 gm/cc.
Fermion Index:
Fermion Index = 0.14 Boson Index = 0.86
Photoelectric:
PEChervetite =1,199.27 barns/electronU=PEChervetite x r Electron Density=6,494.08 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Chervetite is Not Radioactive
Chervetite Classification
Dana Class:
38.05.05.01 (38) Anhydrous Phosphates, etc
(38.05) with miscellaneous formulae
(38.05.05) Dana Group
38.05.05.01 Chervetite Pb2V2O7 P 21 /a 2/m
38.05.05.02 Ziesite Cu2V2O7 A2/a 2/m
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
References:
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
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
14 - WWW-MINCRYST
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Chervetite
Pb2V2O7
Dana No: 38.05.05.01 Strunz No: 08.FA.15
Locality:
Notes:
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