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Grossmanite is a very rare mineral of the pyroxene group, with formula CaTiAlSiO₆. It is the titanium-dominant member. Grossmanite is unique in being a mineral with trivalent titanium, a feature shared with tistarite, Ti₂O₃. 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.

References

1. ^ Mindat, Grossmanite, http://www.mindat.org/min-39426.html
2. Ma, C., and Rossmann, G.R., 2009: Grossmanite, CaTiAlSiO₆, a new pyroxene from the Allende meteorite. American Mineralogist 94(10), 1491–1494
3. Mindat, Tistarite, http://www.mindat.org/min-38695.html

v t e Titanium minerals
Oxide minerals	Simple Anatase Brookite Geikielite Rutile Mixed Aeschynite-(Y) Armalcolite Betafite Euxenite Freudenbergite Haggertyite Ilmenite Keilhauite Latrappite Perovskite Polycrase Zimbabweite Zirconolite Zirkelite
Silicate minerals	Aenigmatite Grossmanite Keilhauite Lorenzenite Melanite Nenadkevichite Titanite Zircophyllite
Other	Sabinaite (carbonate mineral) Warwickite (borate mineral)
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