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Alumotantite

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Formula:
AlTaO4
System:
Orthorhombic
Colour:
Colourless to white
Lustre:
Adamantine, Greasy
Hardness:
Name:
For ALUMinium and TANTalum in the composition
This page provides mineralogical data about Alumotantite.


Classification of Alumotantite

Approved
4.DB.55

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
8.1.7.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
18.1.18

18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U

Physical Properties of Alumotantite

Adamantine, Greasy
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless to white
Hardness (Mohs):
Hardness (Vickers):
VHN100=1650 - 1690 kg/mm2
Density:
7.48 g/cm3 (Calculated)

Optical Data of Alumotantite

Type:
Biaxial (-)
Reflectivity:
486 nmR1=15.6%R2= 14.7%
589 nmR1=15.4%R2= 14.6%
656 nmR1=15.9%R2= 15.1%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 15.9%.
R1 shown in black, R2 shown in red

Chemical Properties of Alumotantite

Formula:
AlTaO4
Elements listed in formula:
Analytical Data:
Results from electron microprobe analysis of type material;
Empricial formula calculated for four oxygen atoms per formula unit
Nb2O5 (0.80)
Ta2O5 (81.13)
Al2O3 (18.47)
Common Impurities:
Sn

Crystallography of Alumotantite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcn
Cell Parameters:
a = 4.475 Å, b = 11.308 Å, c = 4.771 Å
Ratio:
a:b:c = 0.396 : 1 : 0.422
Unit Cell Volume:
V 241.43 ų (Calculated from Unit Cell)
Z:
4
Morphology:
as euhedral to subhedral, elongated crystals to 1 mm, with rhombic to rectangular cross-section;
as rims and parallel oriented intergrowths on simpsonite, also rims around natrotantite, which in turn rims simpsonite crystals
X-Ray Powder Diffraction Data:
d-spacingIntensity
1.649 (5)
1.837 (5)
2.439 (5)
2.89 (8)
3.13 (10)
3.64 (7)
5.66 (5)
Comments:
Material from Kola Peninsula, Russia

Occurrences of Alumotantite

Type Occurrence of Alumotantite

Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, Russia
Geological Setting of Type Material:
albitized area of a highly fractionated rare element-enriched granite pegmatite
Empirical Formula:
Al0.98(Ta0.99Nb0.02)Σ=1.01O4

Relationship of Alumotantite to other Species

4.DB.05ArgutiteGeO2
4.DB.05CassiteriteSnO2
4.DB.05PlattneritePbO2
4.DB.05PyrolusiteMnO2
4.DB.05RutileTiO2
4.DB.05TripuhyiteFe3+Sb5+O4
4.DB.05TugarinoviteMoO2
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb25+O6
4.DB.10Tapiolite-(Fe)Fe2+Ta2O6
4.DB.10Tapiolite-(Mn)Mn2+Ta2O6
4.DB.10OrdoñeziteZnSb25+O6
4.DB.15bAkhtenskiteMnO2
4.DB.15cNsutiteMnx2+Mn4+1-xO2-2x(OH)2x
4.DB.15aParamontroseiteVO2
4.DB.15aRamsdelliteMn4+O2
4.DB.20ScrutinyitePbO2
4.DB.25Ishikawaite(U,Fe,Y)NbO4
4.DB.25Ixiolite(Ta,Mn,Nb)O2
4.DB.25Samarskite-(Y)(Y,Ce,U,Fe,Nb)(Nb,Ta,Ti)O4
4.DB.25SrilankiteTi2ZrO6
4.DB.25Yttrocolumbite-(Y)(Y,U,Fe2+)(Nb,Ta)O4
4.DB.25Calciosamarskite(Ca,Fe,Y)(Nb,Ta,Ti)O4
4.DB.25Samarskite-(Yb)YbNbO4
4.DB.30FerberiteFe2+WO4
4.DB.30HübneriteMn2+WO4
4.DB.30SanmartiniteZnWO4
4.DB.30KrasnoselskiteCoWO4
4.DB.30HeftetjerniteScTaO4
4.DB.30HuanzalaiteMgWO4
4.DB.35Columbite-(Fe)Fe2+Nb2O6
4.DB.35Tantalite-(Fe)Fe2+Ta2O6
4.DB.35Columbite-(Mn)Mn2+Nb2O6
4.DB.35Tantalite-(Mn)Mn2+Ta2O6
4.DB.35Columbite-(Mg)MgNb2O6
4.DB.35QitianlingiteFe22+Nb2W6+O10
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)MgTa2O6
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8
4.DB.40LithiotantiteLiTa3O8
4.DB.40LithiowodginiteLiTa3O8
4.DB.40TitanowodginiteMn2+TiTa2O8
4.DB.40WodginiteMn2+Sn4+Ta2O8
4.DB.40FerrotitanowodginiteFe2+TiTa2O8
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteTiV3+O3(OH)
4.DB.50Carmichaelite(Ti,Cr,Fe)(O,OH)2
4.DB.60BiehliteSb23+MoO6
18.1.1LithiotantiteLiTa3O8
18.1.2LueshiteNaNbO3
18.1.3NatroniobiteNaNbO3
18.1.4FranconiteNaNb2O5(OH) · 3H2O
18.1.5NatrotantiteNa2Ta4O11
18.1.6IrtyshiteNa2Ta4O11
18.1.7Rankamaite(Na,K,Pb)(Ta,Nb,Al)4(O,OH)10
18.1.8Hydropyrochlore(H2O,◻)2Nb2(O,OH)6(H2O)
18.1.9CalciotantiteCaTa4O11
18.1.10RynersoniteCaTa2O6
18.1.11Microlite Group(Ca,Na)2Ta2(O,OH,F)7
18.1.12BelyankiniteCa1-2(Ti,Zr,Nb)5O12 · 9H2O
18.1.13LatrappiteCa2NbFe3+O6
18.1.14HochelagaiteCaNb4O11 · 8H2O
18.1.15Bariomicrolite (of Hogarth 1977)
18.1.16ParabariomicroliteBaTa4O10(OH)2 · 2H2O
18.1.17Bariopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.1.19SimpsoniteAl4Ta3O13(OH)
18.1.20SosedkoiteK5Al2Ta22O60
18.1.21ThoreauliteSn2+Ta2O6
18.1.22Stannomicrolite (of Hogarth 1977)
18.1.23FoorditeSn2+Nb2O6
18.1.24ChangbaiitePbNb2O6
18.1.25Plumbopyrochlore (of Skorobogatova et al.)A2Nb2(O,OH)6Z
18.1.26Plumbomicrolite (of Hogarth 1977)
18.1.27StibiocolumbiteSbNbO4
18.1.28StibiotantaliteSb3+TaO4
18.1.29Natrobistantite
18.1.30CesplumtantiteCs2Pb3Ta8O24
18.1.31Stibiomicrolite (of Groat et al.)
18.1.32Cesstibtantite
18.1.34BismutotantaliteBiTaO4
18.1.35Bismutomicrolite (of Hogarth 1977)
18.1.36Tantalite-(Mn)Mn2+Ta2O6
18.1.37GerasimovskiteMn2+(Ti,Nb)5O12 · 9H2O
18.1.38Tapiolite-(Mn)Mn2+Ta2O6
18.1.39Columbite-(Mn)Mn2+Nb2O6
18.1.40WodginiteMn2+Sn4+Ta2O8
18.1.41Ixiolite(Ta,Mn,Nb)O2
18.1.42Columbite-(Fe)Fe2+Nb2O6
18.1.43Tantalite-(Fe)Fe2+Ta2O6
18.1.44Columbite
18.1.45Tantalite(Mn,Fe)(Ta,Nb)2O6
18.1.46Tapiolite(Fe,Mn)(Ta,Nb)2O6
18.1.47Tapiolite-(Fe)Fe2+Ta2O6
18.1.48Columbite-(Mg)MgNb2O6
18.1.50Strüverite(Ti,Ta,Fe)O2
18.1.51 Staringite(Fe,Mn)x(Ta,Nb)2xSn6-3xO12

Other Names for Alumotantite

Name in Other Languages:

Other Information

Bright blue cathodoluminescence
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 Alumotantite

Reference List:
Voloshin, A.V., Men'shikov, Y.P., Pakhomovskii, Y.A. (1981) Alumotantite and natrotantite, new tantalum minerals in granitic pegmatites. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 110: 338-345. [in Russian]

Fleischer, M., Burns, R.G., Cabri, L.J., Francis, C.A., Pabst, A. (1982) New mineral names. American Mineralogist: 67: 413-418. [abstract]

Ercit, T.S., Hawthorne, F.C., Černý, P. (1992) The crystal structure of alumotantite: its relation to the structures of simpsonite and the (Al,Ga)(Ta,Nb)O4 compounds. The Canadian Mineralogist: 30: 653-662.

Jambor, J.L., Burke, E.A.J. (1993) New mineral names. American Mineralogist: 78: 845-849.

Anthony, J. W. et al. (1997) Handbook of Mineralogy, Vol. 3, 10.

Internet Links for Alumotantite

mindat.org URL:
https://www.mindat.org/min-159.html
Please feel free to link to this page.

Localities for Alumotantite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Brazil
 
  • Rio Grande do Norte
    • Borborema mineral province
      • Equador
http://rruff.geo.arizona.edu/doclib/hom/parabariomicrolite.pdf.; Canadian Mineralogist (1986): 24: 655-663.
Democratic Republic of Congo (Zaïre)
 
  • Katanga (Shaba)
Voloshin A.V., Pakhomovskii Ya.A. (1988) Mineralogy of tantalum and niobium in rare-metal pegmatites, - Leningrad, Nauka, p. 240 (in Rus.)
Kazakhstan
 
  • Eastern Kazakhstan Province (Shyghys Qazaqstan Oblysy; Vostochno-Kazakhstanskaya Oblast')
    • Kalba Range
      • Irtysh River
A.V. Voloshin analytical data
Russia (TL)
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Voron'i Tundry
ZVMO (1981) 110/3, 338-345; J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997); Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Zimbabwe
 
  • Masvingo
    • Bikita Area
J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
Mineral and/or Locality  
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