Alumotungstite Mineral Data

Alumotungstite Mineral Data +

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General Alumotungstite Information

Chemical Formula:

(W,Al)(O,OH)3 (?)

Composition:

Molecular Weight = 216.36 gm

Aluminum 1.25 % Al 2.36 % Al₂O₃

Hydrogen 0.09 % H 0.83 % H₂O

Tungsten 76.48 % W 96.44 % WO₃

Oxygen 22.18 % O

______ ______

100.00 % 99.63 % = TOTAL OXIDE

Empirical Formula:

W_0.9Al_0.1O_2.8(OH)_0.2

Environment:

Originally reported as the aluminum analog of ferritungstite.

IMA Status:

Approved IMA 1971

Locality:

Kramat Pulai mine, Kinta district, Perak, Malaysia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition.

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Alumotungstite Crystallography

Cell Dimensions:

a = 10.2, Z = 8; V = 1,061.21 Den(Calc)= 2.71

Crystal System:

IsometricSpace Group: Unk

Physical Properties of Alumotungstite

Color:

Greenish yellow.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Streak:

yellow

Optical Properties of Alumotungstite

Gladstone-Dale:

CI calc= -0.924 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3321,KC= 0.1726

Optical Data:

Isotropic, n=1.9.

Calculated Properties of Alumotungstite

Electron Density:

r_electron=2.31 gm/cc
note: r_{Alumotungstite}=2.71 gm/cc.

Fermion Index

Fermion Index = 0.10931
Boson Index = 0.89069

Photoelectric:

PE_{Alumotungstite}= 969.30 barns/electron
U=PE_{Alumotungstite} x r_electron=2,236.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Alumotungstite is Not Radioactive

Alumotungstite Classification

Dana Class:

4.5.4.1 (4)Simple Oxides

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

(4.5.4)Dana Group

4.5.4.1 Alumotungstite (W,Al)(O,OH)3(?) Unk Cubic

Strunz Class:

IV/E.02-40 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 Alumotungstite Information

References:

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

See Also:

Links to other databases for Alumotungstite :
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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Alumotungstite

(W,Al)(O,OH)3 (?)
Dana No: 4.5.4.1 Strunz No: IV/E.02-40
Locality:

Notes: