Mineralogy Database

Cuprotungstite Mineral Data

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General Cuprotungstite Information

Help on Chemical  Formula: Chemical Formula: Cu++3(WO4)2(OH)2
Help on Composition: Composition: Molecular Weight = 720.35 gm
   Copper    26.46 %  Cu   33.13 % CuO
   Hydrogen   0.28 %  H     2.50 % H2O
   Tungsten  51.04 %  W    64.37 % WO3
   Oxygen    22.21 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu3(WO4)2(OH)2
Help on Environment: Environment: Common mineral in the oxidized zone of scheelite deposits containing primary copper sulfides.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1869
Help on Locality: Locality: La Paz, Baja California Sur, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its composition.

Cuprotungstite Image

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Comments: Tan coatings of cuprotungstite on quartz.
Location: Lida, Esmeralda County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Jixianite   Cuprotungstite

Comments: Reddish brown crystal druse of jixianite with minor tan cuprotungstite.
Location: Apache Mine, Hidalgo County, New Mexico, USA. Scale: See Image.
© Jeff Weissman / Photographic Guide to Mineral Species

Cuprotungstite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.6215
Help on Cell Dimensions: Cell Dimensions: a = 8.93, c = 14.48, Z = 7; V = 1,154.71 Den(Calc)= 7.25
Help on Crystal System: Crystal System: Tetragonal Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.07(1), 1.24(0.9), 1.91(0.8),

Physical Properties of Cuprotungstite

Help on Color: Color: Brown green, Olive green, Yellowish green.
Help on Density: Density: 7.06
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Waxy
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: green

Optical Properties of Cuprotungstite

Help on Dichroism (e): Dichroism (e): none.
Help on Dichroism (w): Dichroism (w): none.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.077 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.101 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1572,KPDmeas= 0.1615,KC= 0.1749
Ncalc = 2.23 - 2.27
Help on Optical Data: Optical Data: Uniaxial (-), e=2.1, w=2.18, bire=0.0800.

Calculated Properties of Cuprotungstite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.21 gm/cc
note: Specific Gravity of Cuprotungstite =7.06 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PECuprotungstite = 638.45 barns/electron
U=PECuprotungstite x rElectron Density=3,967.13 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cuprotungstite is Not Radioactive

Cuprotungstite Classification

Help on  Dana Class: Dana Class: (48)Anhydrous Molybdates and Tungstates
  (48.03)(Basic Anhydrous)
  (48.03.02)Dana Group Cuprotungstite Cu3(WO4)2(OH)2 Unk Tetra
Help on  Strunz Class: Strunz Class: 07.GB.15 07 - SULFATES (SELENATES, TELLURATES)
  07.G - Molybdates, Wolframates and Niobates
  07.GB -With additional anions and/or H2O
07.GB.15 Cuprotungstite Cu3(WO4)2(OH)2 Unk Tetra

Other Cuprotungstite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Cuprotungstite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 07.GB.15





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