Volborthite Mineral Data

Volborthite Mineral Data +

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General Volborthite Information

Chemical Formula:

Cu++3V+++++2O7(OH)2·2(H2O)

Composition:

Molecular Weight = 474.56 gm

Vanadium 21.47 % V 38.33 % V₂O₅

Copper 40.17 % Cu 50.29 % CuO

Hydrogen 1.27 % H 11.39 % H₂O

Oxygen 37.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₃V⁵⁺₂O₇(OH)₂·2(H₂O)

Environment:

Secondary mineral associated with U-V Colorado Plateau type deposits.

IMA Status:

Valid Species (Pre-IMA) 1838

Locality:

Syssersk and Nizhne Taglisk, Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Alexander von Volborth (1800-1876), Russian paleontologist who first noted the mineral.

Synonym:

ICSD 63282

PDF 46-1443

Volborthite Image

Images:

Volborthite Vashegyite

Comments: Small bluish-white crystals of vashegyite with green volborthite.
Location: Jeremias Gl?ck Mine (Fairy Grotto), Garnsdorf, Saalfeld, Thuringia, Germany. Scale: Picture size 1.8 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Volborthite

Comments: Shale with a heavy coating of brilliant green, scaly crystals of volborthite.
Location: Monument #1 Mine, Apache County, Arizona. Scale: 6.5 x 5.5 cm.
© John Veevaert

Volborthite Crystallography

Axial Ratios:

a:b:c =1.8052:1:1.2279

Cell Dimensions:

a = 10.604, b = 5.874, c = 7.213, Z = 2; beta = 94.9° V = 447.64 Den(Calc)= 3.52

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): 7.26(1), 2.56(0.8), 2.87(0.8),

Crystal Structure:

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Lafontaine M A , LeBail A , Ferey G , Journal of Solid State Chemistry , 85 (1990) p.220-227, Copper-containing minerals - I. Cu3V2O7(OH)2,2H2O: The synthetic homolog

View Additional jPOWD Structure files for Volborthite
[1]

Physical Properties of Volborthite

Cleavage:

[???] Perfect

Color:

Brownish yellow, Greenish yellow, Yellow, Yellow green, Light brown.

Density:

3.5

Diaphaniety:

Translucent to Subtranslucent

Habit:

Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).

Habit:

Scaly - Morphology like fish scales.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Magnetism:

Nonmagnetic

Streak:

light green

Optical Properties of Volborthite

Gladstone-Dale:

CI meas= -0.167 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.161 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2955,KPDmeas= 0.2971,KC= 0.2545

Optical Data:

Biaxial (-), a=2.01, b=2.04, g=2.07, bire=0.0600

Calculated Properties of Volborthite

Electron Density:

r_electron=3.37 gm/cc
note: r_Volborthite=3.52 gm/cc.

Fermion Index

Fermion Index = 0.00071
Boson Index = 0.99929

Photoelectric:

PE_Volborthite= 21.84 barns/electron
U=PE_Volborthite x r_electron= 73.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Volborthite is Not Radioactive

Volborthite Classification

Dana Class:

40.3.10.1 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.10)Dana Group

40.3.10.1 Volborthite Cu3V2O7(OH)2·2(H2O) C 2/m 2/m

Strunz Class:

VII/D.24-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.24 - Volborthite series

VII/D.24-10 Volborthite Cu3V2O7(OH)2·2(H2O) C 2/m 2/m

Other Volborthite Information

References:

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

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Volborthite

Cu++3V+++++2O7(OH)2·2(H2O)
Dana No: 40.3.10.1 Strunz No: VII/D.24-10
Locality:

Notes: