Mineral Information and Data:

Alumotantite
AlTaO4 [CNMNC approved formula]

Named for ALUMinum and TANTalum in the composition.

IMA status : Approved Species 1981 (IMA1980-025)
CLASSIFICATION 
Dana
(8th edition) :
08.01.07.01  
  (08) Multiple Oxides with Nb, Ta, and Ti
  (08.01) where A BO4
  (08.01.07)
  
Nickel-Strunz
(10th edition) :
04.DB.55
  (04) Oxides and Hydroxides
  (04.D) Metal:Oxygen = 1:2 and similar
  (04.DB) With medium-sized cations; chains of edge-sharing octahedra
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 4.473-4.477 Å, b = 11.308-11.309 Å, c = 4.767-4.775 Å
Crystal Habit: Euhedral to anhedral crystals to 1 mm, elongated with rhombic to rectangular cross-section. As rims on Simpsonite and Natrotantite
  
Color: Colorless to white.
Diaphaneity: Transparent to translucent
Luster: Adamantine to greasy
Hardness (Mohs): 7.5
Measured Density: 7.48 (calculated) g/cm3
  
Geologic Setting: In albitized areas of highly fractionated rare element-enriched granite pegmatites.
Mineral Association: Simpsonite, natrotantite, microlite, cesstibtantite, sosedkoite, albite (Kola Peninsula, Russia); simpsonite, manganoan tapiolite, manganotantalite, zirconian hafnon, apatite, albite, muscovite (Bikita, Zimbabwe); simpsonite, manganotantalite, microlite, parabariomicrolite (Alto do Giz pegmatite, Brazil).
  

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