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Alumotungstite

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About AlumotungstiteHide

Formula:
2W2O6(H2O)
Crystal System:
Isometric
Name:
For its aluminium content and by analogy to ferritungstite.
Previously considered to be a species, but now understood to be an aluminium-rich variety of hydrokenoelsmoreite.


Classification of AlumotungstiteHide

Discredited
Approval History:
Approved IMA 1971.
Discredited (Atencio et al. 2013, 2012 IMA Report)
7.15.8

7 : Oxides and Hydroxides
15 : Oxides of Mo and W

Pronounciation of AlumotungstiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of AlumotungstiteHide

Transparency:
Transparent, Translucent

Optical Data of AlumotungstiteHide

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

Chemical Properties of AlumotungstiteHide

Formula:
2W2O6(H2O)

Crystallography of AlumotungstiteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 10.2 Å
Unit Cell 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}

Synonyms of AlumotungstiteHide

Other Language Names for AlumotungstiteHide

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.15.1TugarinoviteMoO2Mon.
7.15.2MolybditeMoO3Orth.
7.15.3SidwilliteMoO3 · 2H2OMon.
7.15.4IlsemanniteMo3O8 · nH2O
7.15.5TungstiteWO3 · H2OOrth.
7.15.6HydrotungstiteWO3 · 2H2OMon.
7.15.7MeymaciteWO3 · 2H2OAmor.
7.15.9JixianitePb(W,Fe3+)2(O,OH)7Iso. m3m (4/m 3 2/m) : Fd3m

Other InformationHide

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

References for AlumotungstiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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. (1977) in: M. Fleischer. US Geol. Surv. Open-File Report 81-1169.
Sahama, T.G. (1981) The secondary tungsten minerals, a review. Mineralogical Record: 12: 81-87.
Anthony, J.W. et al. (1997) Handbook of Mineralogy, Vol. 3, 11.
Atencio, D., Andrade, M.B., Christy, A.G., Gieré, R., and Kartashov, P.M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist: 48: 673-698.
Christy, A.G. and Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine: 77: 13-20.

Internet Links for AlumotungstiteHide

Localities for AlumotungstiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Malaysia
 
  • Perak
    • Kinta District
      • Kramat Pulai
Bernard & Hyrsl (2004) Minerals and their Localities. (Granit, Prague)
Rwanda
 
  • Kigali City Province
    • Kigali
Dewaele, S., De Clercq, F., Hulsbosch, N., Piessens, K., Boyce, A., Burgess, R., & Muchez, P. (2016). Genesis of the vein-type tungsten mineralization at Nyakabingo (Rwanda) in the Karagwe–Ankole belt, Central Africa. Mineralium Deposita, 51(2), 283-307.
  • Northern Province
    • Cyeru Commune
      • Gifurwe sector
J. W. Anthony et al.: "Handbook of Mineralogy", Vol.3 (1997), 11
Uganda
 
  • Western Region
    • 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
      • Plymouth
        • Plympton
Bernard & Hyrsl (2004) Minerals and their Localities. (Granit, Prague); Steve Rust, Richard de Nul, and Gunnar Färber specimens.
Mineral and/or Locality  
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