Mineralogy Database

Meymacite Mineral Data

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General Meymacite Information

Help on Chemical  Formula: Chemical Formula: WO3•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: WO3•2(H2O)
Help on Environment: Environment: Alteration product of scheelite. Highly questionalble species.
Help on IMA Status: IMA Status: Approved IMA 1961
Help on Locality: Locality: Meymac, Correze, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Meymacite + Pronunciation Say MEYMACITE
Help on Synonym: Synonym: ferritungstite

Meymacite Image

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

Meymacite Crystallography

Help on Crystal System: Crystal System: Amorphous- No Crystals

Physical Properties of Meymacite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow brown.
Help on Density: Density: 3.94 - 4.1, Average = 4.01
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: brownish yellow

Optical Properties of Meymacite

Help on Optical Data: Optical Data: NCalc= 1.78 - from Gladstone-Dale relationship (KC = 0.1937) where Ncalc=Dmeas*KC+1

Calculated Properties of Meymacite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Meymacite =4.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEMeymacite = 840.62 barns/electron
U=PEMeymacite x rElectron Density=2,977.16 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Meymacite is Not Radioactive

Meymacite Classification

Help on  Dana Class: Dana Class: (04)Simple Oxides
  (04.05)with a cation charge of 6+ (A++++++ O3)
  (04.05.03)Dana Group Meymacite WO3•2(H2O) None
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 04.FJ.05





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