Cuprotungstite Mineral Data

General Cuprotungstite Information

Chemical Formula:

Cu++3(WO4)2(OH)2

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

Empirical Formula:

Cu₃(WO₄)₂(OH)₂

Environment:

Common mineral in the oxidized zone of scheelite deposits containing primary copper sulfides.

IMA Status:

Valid Species (Pre-IMA) 1869

Locality:

La Paz, Baja California Sur, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for its composition.

Cuprotungstite Image

Images:

Cuprotungstite

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

Images:

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

Axial Ratios:

a:c = 1:1.6215

Cell Dimensions:

a = 8.93, c = 14.48, Z = 7; V = 1,154.71 Den(Calc)= 7.25

Crystal System:

Tetragonal Space Group: Unk

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

By Intensity(I/I_o): 3.07(1), 1.24(0.9), 1.91(0.8),

Physical Properties of Cuprotungstite

Color:

Brown green, Olive green, Yellowish green.

Density:

7.06

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Waxy

Magnetism:

Nonmagnetic

Streak:

green

Optical Properties of Cuprotungstite

Dichroism (e):

none.

Dichroism (w):

none.

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

Optical Data:

Uniaxial (-), e=2.1, w=2.18, bire=0.0800.

Calculated Properties of Cuprotungstite

Electron Density:

Bulk Density (Electron Density)=6.21 gm/cc
note: Specific Gravity of Cuprotungstite =7.06 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_{Cuprotungstite}= 638.45 barns/electron
U=PE_{Cuprotungstite} x rElectron Density=3,967.13 barns/cc.

Radioactivity:

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

Cuprotungstite Classification

Dana Class:

48.03.02.01 (48)Anhydrous Molybdates and Tungstates

(48.03)(Basic Anhydrous)

(48.03.02)Dana Group

48.03.02.01 Cuprotungstite Cu3(WO4)2(OH)2 Unk Tetra

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)

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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Cuprotungstite

Cu++3(WO4)2(OH)2
Dana No: 48.03.02.01 Strunz No: 07.GB.15
Locality:

Notes:

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