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Alumotungstite

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Hemerdon Mine (Hemerdon Bal Mine; Hemerdon Ball Mine), Plympton, Tavistock District, Devon, England, UK
© Steve Rust

Show Alumotungstite Photos (2)
Formula:
(W,Al)(O,OH)
 
3
System:IsometricColour:White
Name:For its aluminium content and by analogy to ferritungstite


The Aluminium analogue of Ferritungstite

Classification of Alumotungstite

IMA status:Approved
Strunz 8th edition ID:4/E.02-40
Nickel-Strunz 10th (pending) edition ID:4.DH.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
H : With large (+- medium-sized) cations; sheets of edge-sharing octahedra
Dana 8th edition ID:4.5.4.1

4 : SIMPLE OXIDES
5 : AX3
Hey's CIM Ref.:7.15.8

7 : Oxides and Hydroxides
15 : Oxides of Mo and W
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Type Occurrence of Alumotungstite

Type Locality:Kramat Pulai Mine, Pulai, Kinta District, Perak, Malaysia
General Appearance of Type Material:As crystals, to 250 µm, in rounded aggregates; in microcrystalline patches, intimately intergrown with yttrotungstite
Place of Conservation of Type Material:National History Museum, London, England
Year of Discovery:1971
Geological Setting of type material:in fine-grained aggregates of yttrotungstite
Associated Minerals at type locality:
Yttrotungstite-(Y)

Occurrences of Alumotungstite

Geological Setting:in cavities relict after ferberite, which has replaced scheelite, in fine-grained graphitic schists and contained quartz veins

Physical Properties of Alumotungstite

Diaphaneity (Transparency):Translucent
Colour:White
Density (calculated):4.52 g/cm3

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:octahedra, sometimes flattened with a hexagonal outline
Twinning:interpenetrant octahedra may represent twins on {111}
X-Ray Powder Diffraction:
d-spacingIntensity
5.86 (vvs)
3.07 (vs)
2.93 (vs)
1.80 (s)
1.96 (ms)
1.72 (ms)
Comments:Recorded on material from Kramat Pulai Mine, Malaysia

Optical Data of Alumotungstite

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

Chemical Properties of Alumotungstite

Formula:
(W,Al)(O,OH)
 
3
Essential elements:O, W
All elements listed in formula:Al, H, O, W
Analyical Data:Kramat Pulai Mine, Malaysia, by electron microprobe
WO3 (88.0)
SiO2 (0.24)
Al2O3 (8.3)
Fe2O3 (0.06)
CaO (0.77)

sum 97.4 wt.-%

Relationship of Alumotungstite to other Species

Related Minerals - Nickel-Strunz Grouping):
4.DH.05Brannerite
(U
4+
 
,Ca)(Ti,Fe
3+
 
)
 
2
O
 
6
4.DH.05Orthobrannerite
UTi
 
4
O
 
12
(OH)
 
2
4.DH.05Thorutite
(Th,U,Ca)Ti
 
2
(O,OH)
 
6
4.DH.10Kassite
CaTi
 
2
O
 
4
(OH)
 
2
4.DH.10Lucasite-(Ce)
CeTi
 
2
(O,OH)
 
6
4.DH.15Bariomicrolite
Ba(Ta,Nb)
 
2
(O,OH)
 
7
4.DH.15Bariopyrochlore
(Ba,Sr)
 
2
(Nb,Ti)
 
2
(O,OH)
 
7
4.DH.15Betafite
(Ca,U)
 
2
(Ti,Nb)
 
2
O
 
6
(OH)
4.DH.15Bismutomicrolite
(Bi,Ca)(Ta,Nb)
 
2
O
 
6
(OH)
4.DH.15Calciobetafite
(Ca,RE,Th,U)
 
2
(Nb,Ta,Ti)
 
2
O
 
7
4.DH.15Ceriopyrochlore-(Ce)
(Ce,Ca,Y)
 
2
(Nb,Ta)
 
2
O
 
6
(OH,F)
4.DH.15Cesstibtantite
(Cs,Na)SbTa
 
4
O
 
12
4.DH.15Ferritungstite
(W,Fe
3+
 
)(O,OH)
 
3
4.DH.15Jixianite
Pb(W,Fe
3+
 
)
 
2
(O,OH)
 
7
4.DH.15Kalipyrochlore
(K,Sr)
 
2-x
Nb
 
2
O
 
6
(O,OH)·nH
 
2
O
4.DH.15Microlite
(Ca,Na)
 
2
Ta
 
2
O
 
6
(O,OH,F)
4.DH.15Natrobistantite
(Na,Cs)Bi(Ta,Nb,Sb)
 
4
O
 
12
4.DH.15Plumbopyrochlore
(Pb,Y,U,Ca)
 
2-x
Nb
 
2
O
 
6
(OH)
4.DH.15Plumbomicrolite
(Pb,Ca,U)
 
2
Ta
 
2
O
 
6
(OH)
4.DH.15Plumbobetafite
(Pb,U,Ca)(Ti,Nb)
 
2
O
 
6
(OH,F)
4.DH.15Pyrochlore
(Ca,Na)
 
2
Nb
 
2
O
 
6
(OH,F)
4.DH.15Stibiomicrolite
(Sb,Ca,Na)
 
2
(Ta,Nb)
 
2
O
 
7
4.DH.15Strontiopyrochlore
(Sr,Ce,Ca)
 
0.66
(Nb,Fe)
 
2
(O,OH)
 
7
4.DH.15Stannomicrolite
(Sn,Fe,Mn)
 
2
(Ta,Nb,Sn)
 
2
(O,OH)
 
7
4.DH.15Stibiobetafite
(Sb,Ca)
 
2
(Ti,Nb,Ta)
 
2
(O,OH)
 
7
4.DH.15Uranmicrolite
(U,Ca,Ce)
 
2
(Ta,Nb)
 
2
O
 
6
(OH,F)
4.DH.15Uranpyrochlore
(U,Ca,Ce)
 
2
(Nb,Ta)
 
2
O
 
6
(OH,F)
4.DH.15Yttrobetafite-(Y)
(Y,U,Ce)
 
2
(Ti,Nb,Ta)
 
2
O
 
6
OH
4.DH.15Yttropyrochlore-(Y)
(Y,Na,Ca,U)
 
1-2
(Nb,Ta,Ti)
 
2
(O,OH)
 
7
4.DH.15Fluornatromicrolite
(Na,Ca,Bi)
 
2
Ta
 
2
O
 
6
F
4.DH.15Bismutopyrochlore
(Bi,U,Ca,Pb)
 
1+x
(Nb,Ta)
 
2
O
 
6
(OH)·nH
 
2
O
4.DH.15Thorian Pyrochlore
4.DH.15Elsmoreite
WO
 
3
·0.5H
 
2
O
4.DH.20Bismutostibiconite
Bi(Sb
5+
 
,Fe
3+
 
)
 
2
O
 
7
4.DH.20Bindheimite
Pb
 
2
Sb
 
2
O
 
6
(O,OH)
4.DH.20Monimolite
(Pb,Ca,Fe)
 
3
Sb
 
2
O
 
7
4.DH.20Partzite
Cu
 
2
Sb
 
2
(O,OH)
 
7
4.DH.20Roméite
(Ca,Fe,Mn,Na)
 
2
(Sb,Ti)
 
2
O
 
6
(O,OH,F)
4.DH.20Stetefeldtite
Ag
 
2
Sb
 
2
(O,OH)
 
7
4.DH.20Stibiconite
SbSb
 
2
O
 
6
(OH)
4.DH.25Rosiaite
PbSb
5+
2
O
 
6
4.DH.30Zirconolite
CaZrTi
 
2
O
 
7
4.DH.35Liandratite
U(Nb,Ta)
 
2
O
 
8
4.DH.35Petscheckite
UFe(Nb,Ta)
 
2
O
 
8
4.DH.40Ingersonite
Ca
 
3
MnSb
 
4
O
 
14
4.DH.45Pittongite
Na
 
0.22
(W,Fe
3+
 
)(O,OH)
 
3
 · 0.44H
 
2
O
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
German names:
Alumotungstit
Spanish names:
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

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    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
    		Min.Mag.(1971) 38, 261-285
    Rwanda
     
    • Ruhengeri 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
    J. W. Anthony et al.: "Handbook of Mineralogy", Vol.3 (1997), 11
    UK
     
    • England
      • Devon
        • Tavistock District
          • Plympton
    Mineral and/or Locality
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