Chervetite Mineral Data

General Chervetite Information

Chemical Formula:

Pb2V2O7

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

Empirical Formula:

Pb₂V⁵⁺₂O₇

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 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

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_Chervetite=1,199.27 barns/electron
U=PE_Chervetite x rElectron 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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Print or Cut-and-Paste your Chervetite Specimen Label here :

Chervetite

Pb2V2O7
Dana No: 38.05.05.01 Strunz No: 08.FA.15
Locality:

Notes:

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