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.

Name Pronunciation:

Alumotungstite + Pronunciation

Alumotungstite Image

Images:

Alumotungstite

Comments: Pale orange, chalky crust of alumotungstite on ferberite with quartz.
Location: Hemerdon mine, Sparkwell, Plympton, Devon, England. Scale: See Image.
© Rruff Database

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
Ncalc = 1.47

Optical Data:

Isotropic, n=1.9.

Calculated Properties of Alumotungstite

Electron Density:

Bulk Density (Electron Density)=2.31 gm/cc
note: Specific Gravity of Alumotungstite =2.71 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

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

Radioactivity:

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

Alumotungstite Classification

Dana Class:

04.05.04.01 (04)Simple Oxides

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

(04.05.04)Dana Group

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

Strunz Class:

04.DH.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DH -With large (± medium-sized) cations; sheets of edge-sharing octahedra

04.DH.15 Alumotungstite (W,Al)(O,OH)3(?) Unk Cubic

04.DH.15 Betafite (Ca,U)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Ferritungstite (K,Ca,Na)(W,Fe)2(O,OH)6•(H2O) F d3m 4/m 3 2/m

04.DH.15 Cesstibtantite (Cs,Na)SbTa4O12 F d3m 4/m 3 2/m

04.DH.15 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

04.DH.15 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Calciobetafite Ca2(Ti,Nb)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Jixianite Pb(W,Fe)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6•(H2O,K) F d3m 4/m 3 2/m

04.DH.15 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m

04.DH.15 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m

04.DH.15 Natrobistantite (Na,Cs)Bi(Ta,Nb,Sb)4O12 F d3m 4/m 3 2/m

04.DH.15 Plumbobetafite (Pb,U,Ca)(Ti,Nb)2O6(OH,F) F d3m 4/m 3 2/m

04.DH.15 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Stibiobetafite (Sb,Ca)2(Ti,Nb,Ta)2(O,OH)7 F d3m 4/m 3 2/m

04.DH.15 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

04.DH.15 Bismutopyrochlore! (Bi,U,Ca,Pb)1x(Nb,Ta)2O6(OH)•n(H2O) F d3m 4/m 3 2/m

04.DH.15 Fluornatromicrolite! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m

04.DH.15 Yttrobetafite-(Y) (Y,U,Ce)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m

04.DH.15 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3

04.DH.15 Elsmoreite! WO3•0.5(H2O) F d3m 4/m 3 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 - 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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Alumotungstite

(W,Al)(O,OH)3 (?)
Dana No: 04.05.04.01 Strunz No: 04.DH.15
Locality:

Notes: