Mineralogy Database

Volborthite Mineral Data

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General Volborthite Information

Help on Chemical  Formula: Chemical Formula: Cu++3V+++++2O7(OH)2•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Cu3V5+2O7(OH)2•2(H2O)
Help on Environment: Environment: Secondary mineral associated with U-V Colorado Plateau type deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1838
Help on Locality: Locality: Syssersk and Nizhne Taglisk, Ural Mountains, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alexander von Volborth (1800-1876), Russian paleontologist who first noted the mineral.
Help on Name Pronunciation: Name Pronunciation: Volborthite + Pronunciation Say VOLBORTHITE
Help on Synonym: Synonym: ICSD 63282
  PDF 46-1443

Volborthite Image

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  Vashegyite   Volborthite

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

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.8052:1:1.2279
Help on Cell Dimensions: Cell Dimensions: a = 10.604, b = 5.874, c = 7.213, Z = 2; beta = 94.9° V = 447.64 Den(Calc)= 3.52
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.26(1), 2.56(0.8), 2.87(0.8),

Physical Properties of Volborthite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Brownish yellow, Greenish yellow, Yellow, Yellow green, Light brown.
Help on Density: Density: 3.5
Help on Diaphaneity: Diaphaneity: Translucent to Subtranslucent
Help on Habit: Habit: Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Help on Habit: Habit: Scaly - Morphology like fish scales.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: light green

Optical Properties of Volborthite

Help on Gladstone-Dale: 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
Ncalc = 1.89 - 1.9
Help on Optical Data: Optical Data: Biaxial (-), a=2.01, b=2.04, g=2.07, bire=0.0600

Calculated Properties of Volborthite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.37 gm/cc
note: Specific Gravity of Volborthite =3.52 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0007166428
Boson Index = 0.9992833572
Help on Photoelectric: Photoelectric: PEVolborthite = 21.84 barns/electron
U=PEVolborthite x rElectron Density= 73.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Volborthite is Not Radioactive

Volborthite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 � x(H2O)
  (40.03.10)Dana Group Volborthite Cu3V2O7(OH)2•2(H2O) C 2/m 2/m Martyite! Zn3V2O7(OH)2•2H2O P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 08.FD.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.F - Polyphosphates, Polyarsenates, [4]-Polyvanadates
  08.FD -Polyphosphates, etc, with OH and H2O
08.FD.05 Volborthite Cu3V2O7(OH)2•2(H2O) C 2/m 2/m
08.FD.05 Martyite! Zn3V2O7(OH)2•2H2O P 3m1 3 2/m

Other Volborthite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Volborthite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 08.FD.05





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