Grossmanite is a very rare mineral of the pyroxene group,
[Mindat, Grossmanite, http://www.mindat.org/min-39426.html] with formula CaTi
3+AlSiO
6. It is the
titanium
Titanium is a chemical element; it has symbol Ti and atomic number 22. Found in nature only as an oxide, it can be reduced to produce a lustrous transition metal with a silver color, low density, and high strength, resistant to corrosion in ...
-dominant member. Grossmanite is unique in being a mineral with trivalent titanium, a feature shared with
tistarite, Ti
2O
3.
[Mindat, Tistarite, http://www.mindat.org/min-38695.html] Titanium in minerals is almost exclusively tetravalent. Grossmanite stands for titanium-analogue of
davisite
Davisite is an exceedingly rare mineral of the pyroxene group, with formula CaScAlSiO6. It is the scandium-dominant member.Mindat, http://www.mindat.org/min-38829.html It stands for scandium-analogue of other pyroxene-group members, esseneite, gro ...
,
esseneite
Esseneite is a relative rare mineral of the pyroxene group, with formula CaFeAlSiO6. It is the ferric-iron-dominant member. Esseneite is an iron-analogue of other pyroxene-group members, davisite, grossmanite, and kushiroite. It is a metamorphic mi ...
and
kushiroite – other members of the pyroxene group. Both grossmanite and tistarite come from the famous
Allende meteorite.
References
Pyroxene group
Inosilicates
Calcium minerals
Titanium minerals
Aluminium minerals
Monoclinic minerals
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