Vesignieite Mineral Data

General Vesignieite Information

Chemical Formula:

Cu3Ba(VO4)2(OH)2

Composition:

Molecular Weight = 591.86 gm

Barium 23.20 % Ba 25.91 % BaO

Vanadium 17.21 % V 30.73 % V₂O₅

Copper 32.21 % Cu 40.32 % CuO

Hydrogen 0.34 % H 3.04 % H₂O

Oxygen 27.03 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₃Ba(VO₄)₂(OH)₂

Environment:

Found as geodes in Mn ore at the locality.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Friedrichsroda, Thuringen, Germany. Link to MinDat.org Location Data.

Name Origin:

Named after the French mineral collector, Colonel Jean Paul Louis Vesignie (1870-1954) and former president of the Mineralgical Society of France.

Name Pronunciation:

Vesignieite + Pronunciation

Synonym:

Calciovolborthite

ICSD 67726

PDF 44-1469

Vesignieite Image

Images:

Vesignieite

Comments: Green crystalline vesignieite crust with crudely developed radiating structure.
Location: Newmont Gold Mine, Carlin, Elko County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Vesignieite Crystallography

Axial Ratios:

a:b:c =1.7374:1:1.3045

Cell Dimensions:

a = 10.27, b = 5.911, c = 7.711, Z = 2; beta = 116.42° V = 419.21 Den(Calc)= 4.69

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.22(1), 2.7135(0.8), 2.5635(0.6),

Crystal Structure:

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Zhesheng M , Ruilin H , Xiaoling Z , Acta Geologica Sinica , 4 (1991) p.145-151, Redetermination of the crystal structure of vesignieite, Locality: Chigou black shale system, Ankang county, Shaanxi Province, China, Note: y- and z-coordinates of Ba altered

Physical Properties of Vesignieite

Cleavage:

{001} Good

Color:

Yellow green, Dark green, Olive green.

Density:

4 - 4.1, Average = 4.05

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Vesignieite

Gladstone-Dale:

CI meas= -0.26 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.088 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2356,KPDmeas= 0.2728,KC= 0.2165
Ncalc = 1.87 - 2.02

Optical Data:

Biaxial (-), a=2.053, b=2.129, g=2.133, bire=0.0800, 2V(Calc)=24, 2V(Meas)=60.

Calculated Properties of Vesignieite

Electron Density:

Bulk Density (Electron Density)=4.29 gm/cc
note: Specific Gravity of Vesignieite =4.69 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Vesignieite= 119.82 barns/electron
U=PE_Vesignieite x rElectron Density= 514.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Vesignieite is Not Radioactive

Vesignieite Classification

Dana Class:

41.05.13.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.13)Dana Group

41.05.13.01 Vesignieite Cu3Ba(VO4)2(OH)2 C 2/m 2/m

Strunz Class:

08.BH.45 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1

08.BH.45 Bayldonite (Cu,Zn)3Pb(AsO3OH)2(OH)2 A2/a 2/m

08.BH.45 Vesignieite Cu3Ba(VO4)2(OH)2 C 2/m 2/m

Other Vesignieite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Vesignieite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Ask about Vesignieite here :
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Print or Cut-and-Paste your Vesignieite Specimen Label here :

Vesignieite

Cu3Ba(VO4)2(OH)2
Dana No: 41.05.13.01 Strunz No: 08.BH.45
Locality:

Notes: