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Alumotungstite

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System:Isometric
Name:For its aluminium content and by analogy to ferritungstite.
A variety of Hydrokenoelsmoreite

Previously considered to be a species, but now understood to be an aluminium-rich variety of hydrokenoelsmoreite.

Classification of Alumotungstite

Hey's CIM Ref.:7.15.8

7 : Oxides and Hydroxides
15 : Oxides of Mo and W
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Physical Properties of Alumotungstite

Diaphaneity (Transparency):Transparent, Translucent

Crystallography of Alumotungstite

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fd3m {F41/d 3 2/m}
Cell Parameters:a = 10.2Å
Unit Cell Volume:V 1,061.21 ų (Calculated from Unit Cell)
Z:16
Morphology:As octahedra, to 250 μm, may be flattened with a hexagonal outline, and as
rounded groups of octahedra; zoned with a separable outer shell. In microcrystalline patches; intimately intergrown with yttrotungstite or ferritungstite.
Twinning:interpenetrant octahedra may represent twins on {111}

Optical Data of Alumotungstite

Type:Isotropic
Comments:commonly weakly anisotropic; n = 1.935, birefringence 0.02

Relationship of Alumotungstite to other Species

Related Minerals - Hey's Index Grouping:

- +
7.15.1Tugarinovite
MoO
 
2
7.15.2Molybdite
MoO
 
3
7.15.3Sidwillite
MoO
 
3
 · 2H
 
2
O
7.15.4Ilsemannite
Mo
 
3
O
 
8
 · nH
 
2
O
7.15.5Tungstite
WO
 
3
 · H
 
2
O
7.15.6Hydrotungstite
WO
 
3
 · 2H
 
2
O
7.15.7Meymacite
WO
 
3
 · 2H
 
2
O
7.15.9Jixianite
Pb(W,Fe
3+
 
)
 
2
(O,OH)
 
7

Other Names for Alumotungstite

Synonyms:
IMA1968-004
Other Languages:
German:Alumotungstit
Spanish:Alumotungstita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Alumotungstite

Reference List:

- +
Davis, R. J. and Smith, G. W. (1971): Yttrotungstite. Mineralogical Magazine 38, 261-285.

Davis, R. J., Francis, J. G. and Reed, S. J. B. in: M. Fleischer (1977): US Geol. Surv. Open-File Report 81-1169.

Sahama, T. G. (1981): The secondary tungsten minerals, a review. Mineralogical Record 12, 81-87.

J. W. Anthony et al. (1997): "Handbook of Mineralogy", Vol. 3, 11.

Internet Links for Alumotungstite

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    • Localities for Alumotungstite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Malaysia
     
    • Perak
      • Kinta District
        • Pulai
    		Bernard & Hyrsl (2004) Minerals and their Localities. (Granit, Prague)
    Rwanda
     
    • Northern Province
      • Cyeru Commune
        • Gifurwe sector
    		J. W. Anthony et al.: "Handbook of Mineralogy", Vol.3 (1997), 11
    Uganda
     
    • Kigezi District
    		J. W. Anthony et al.: "Handbook of Mineralogy", Vol.3 (1997), 11
    Bernard & Hyrsl (2004) Minerals and their Localities. (Granit, Prague)
    UK
     
    • England
      • Devon
        • Tavistock District
          • Plympton
    		Bernard & Hyrsl (2004) Minerals and their Localities. (Granit, Prague); Steve Rust, Richard de Nul, and Gunnar Farber specimens.
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