Meymacite Mineral Data

General Meymacite Information

Chemical Formula:

WO3•2(H2O)

Composition:

Molecular Weight = 267.88 gm

Hydrogen 1.51 % H 13.45 % H₂O

Tungsten 68.63 % W 86.55 % WO₃

Oxygen 29.86 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

WO₃•2(H₂O)

Environment:

Alteration product of scheelite. Highly questionalble species.

IMA Status:

Approved IMA 1961

Locality:

Meymac, Correze, France. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Meymacite + Pronunciation

Synonym:

ferritungstite

Meymacite Image

Images:

Meymacite

Comments: Orange-brownish to yellow massive Meymacite.
Location: Meymac, Corrèze, Limousin, France. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Meymacite Crystallography

Crystal System:

Amorphous- No Crystals

Physical Properties of Meymacite

Cleavage:

None

Color:

Yellow brown.

Density:

3.94 - 4.1, Average = 4.01

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Luster:

Vitreous - Resinous

Streak:

brownish yellow

Optical Properties of Meymacite

Optical Data:

NCalc= 1.78 - from Gladstone-Dale relationship (KC = 0.1937) where Ncalc=Dmeas*KC+1

Calculated Properties of Meymacite

Electron Density:

Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Meymacite =4.02 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_Meymacite= 840.62 barns/electron
U=PE_Meymacite x rElectron Density=2,977.16 barns/cc.

Radioactivity:

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

Meymacite Classification

Dana Class:

04.05.03.01 (04)Simple Oxides

(04.05)with a cation charge of 6+ (A++++++ O3)

(04.05.03)Dana Group

04.05.03.01 Meymacite WO3•2(H2O) None

Strunz Class:

04.FJ.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FJ -Hydroxides with H2O � (OH); corner-sharing octahedra

04.FJ.05 Meymacite WO3•2(H2O) None

04.FJ.05 Sidwillite MoO3•2(H2O) P 2₁/n 2/m

Other Meymacite Information

References:

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

See Also:

Links to other databases for Meymacite :
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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Print or Cut-and-Paste your Meymacite Specimen Label here :

Meymacite

WO3•2(H2O)
Dana No: 04.05.03.01 Strunz No: 04.FJ.05
Locality:

Notes:

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