Chervetite Mineral Data +

Crystal Vaults

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
IMA Status:	Approved IMA 1963
Locality:	Link to MinDat.org Location Data.
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 - PrismaticH-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),
Crystal Structure: Mouse drag1 - LMB Manipulate Structure drag2 - RMB Resize/Rotate Keyboard S - Stereo Pair on/off H - Help Screen I - Data Info A - Atoms On/Off P - Polyhedra On/Off B - Bonds On/Off Help on Above	Kawahara A , Bulletin de la Societe Francaise de Mineralogie et de Cristallographie , 90 (1967) p.279-284, La structure cristalline de la chervetite, Locality: Mounana, Gabon
Physical Properties of Chervetite
Cleavage:	[100] Indistinct
Color:	Brown, Colorless, Gray.
Density:	6.3 - 6.49, Average = 6.39
Diaphaniety:	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
Optical Data:	Biaxial (-), b=2.2-2.6, 2V(Meas)=65-75.
Calculated Properties of Chervetite
Electron Density:	relectron=5.42 gm/cc note: rChervetite =6.40 gm/cc.
Fermion Index	Fermion Index = 0.14625 Boson Index = 0.85375
Photoelectric:	PEChervetite =1,199.27 barns/electron U=PEChervetite x relectron=6,494.08 barns/cc.
Radioactivity:	GRapi = 0 (Gamma Ray American Petroleum Institute Units) Chervetite is Not Radioactive
Chervetite Classification
Dana Class:	38.5.5.1 (38)Anhydrous Phosphates, etc
	(38.5)with miscellaneous formulae
	(38.5.5)Dana Group
	38.5.5.1 Chervetite Pb2V2O7 P 21/a 2/m
	38.5.5.2 Ziesite Cu2V2O7 A2/a 2/m
Strunz Class:	VII/A.20-30 VII - Phosphates, Arsenates and Vanadates
	VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, waterfree divanadates [V2O7]4-
	VII/A.20 - Ziesite - Chervetite series
	VII/A.20-05 Petewilliamsite! (Ni,Co,Cu)30(As2O7)15 C 2 2
	VII/A.20-10 Ziesite Cu2V2O7 A2/a 2/m
	VII/A.20-20 Blossite Cu2V2O7 F dd2 mm2
	VII/A.20-30 Chervetite Pb2V2O7 P 21/a 2/m
Other Chervetite Information
References:	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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris Search for Chervetite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Chervetite : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Chervetite Mineral Data : Ask about Chervetite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Español Print or Cut-and-Paste your Chervetite Specimen Label here : Chervetite Pb2V2O7 Dana No: 38.5.5.1 Strunz No: VII/A.20-30 Locality:   Notes: