Meymacite Mineral Data

Meymacite Mineral Data +

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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.

Synonym:

ferritungstite

Meymacite Image

Images:

Meymacite

Comments: Orange-brownish to yellow massive Meymacite.
Location: Meymac, Corr?ze, 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:

r_electron=3.54 gm/cc
note: r_Meymacite=4.02 gm/cc.

Fermion Index

Fermion Index = 0.09815
Boson Index = 0.90185

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Meymacite is Not Radioactive

Meymacite Classification

Dana Class:

4.5.3.1 (4)Simple Oxides

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

(4.5.3)Dana Group

4.5.3.1 Meymacite WO3·2(H2O) None

Strunz Class:

IV/E.02-20 IV - Oxides

IV/E - Oxides with metal : oxygen < 1:2 (M2O5, MO3)

IV/E.02 - Tungstite - Cerotungstite-(Ce) series

IV/E.02-10 Tungstite WO3·(H2O) Pmnb 2/m 2/m 2/m

IV/E.02-20 Meymacite WO3·2(H2O) None

IV/E.02-30 Hydrotungstite H2WO4·(H2O) P 2/m 2/m

IV/E.02-40 Alumotungstite (W,Al)(O,OH)3(?) Unk Cubic

IV/E.02-50 Anthoinite AlWO3(OH)3 P1 or P1 Tri

IV/E.02-60 Mpororoite Al(WO3)(OH)3·2(H2O) P1 or P1 Tri

IV/E.02-70 Yttrotungstite-(Y) YW2O6(OH)3 P 2₁/m 2/m

IV/E.02-75 Yttrotungstite-(Ce)! (Ce,Nd,Y)W2O6(OH)3 P 2₁/m 2/m

IV/E.02-80 Cerotungstite-(Ce) CeW2O6(OH)3 P 2₁/m 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Meymacite Specimen Label here :

Meymacite

WO3·2(H2O)
Dana No: 4.5.3.1 Strunz No: IV/E.02-20
Locality:

Notes: