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]

References

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

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[Mindat-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