Grossmanite

Grossmanite is a very rare mineral of the pyroxene group,[1] with formula CaTi3+AlSiO6.[2] It is the titanium-dominant member. Grossmanite is unique in being a mineral with trivalent titanium, a feature shared with tistarite, Ti2O3.[3] Titanium in minerals is almost exclusively tetravalent. Grossmanite stands for titanium-analogue of davisite, esseneite and kushiroite - other members of the pyroxene group. Both grossmanite and tistarite come from the famous Allende meteorite.[1]

Grossmanite
General
CategoryMineral
Formula
(repeating unit)		CaTi3+AlSiO6

References
  1. Mindat, Grossmanite, http://www.mindat.org/min-39426.html
  2. Ma, C., and Rossmann, G.R., 2009: Grossmanite, CaTi3+AlSiO6, a new pyroxene from the Allende meteorite. American Mineralogist 94(10), 1491-1494
  3. Mindat, Tistarite, http://www.mindat.org/min-38695.html


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