Tistarite

Tistarite
General
Category Oxide minerals
Formula
(repeating unit)		 Ti2O3
Strunz classification 4.CB.05
Crystal system Trigonal
Identification
Crystal symmetry Trigonal - hexagonal scalenohedral
H-M symbol (3 2/m)
Space group: R3c
References [1]

Tistarite is an exceedingly rare mineral with the formula Ti2O3, thus being the natural analogue of titanium(III) oxide.[2][1] In terms of chemistry it is the titanium-analogue of hematite, corundum, eskolaite, and karelianite. Other minerals with the general formula A2O3 are arsenolite, avicennite, claudetite, bismite, bixbyite, kangite, sphaerobismoite, yttriaite-(Y) and valentinite. Tistarite and grossmanite - both found in the famous Allende meteorite (so is kangite) - are the only currently known minerals with trivalent titanium. Titanium in minerals is almost exclusively tetravalent.[1][3][4]

References

  1. 1 2 3 Mindat, Tistarite, http://www.mindat.org/min-38695.html
  2. ↑ Ma, C., and Rossmann, G.R., 2009: Tistarite, Ti2O3, a new refractory mineral from the Allende meteorite. American Mineralogist 94(5-6), 841-844
  3. ↑ Mindat, Kangite, http://www.mindat.org/min-42879.html
  4. ↑ Mindat, Yttriaite-(Y), http://www.mindat.org/min-40471.html
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