Kushiroite

Kushiroite is a rare mineral of the pyroxene group, with formula CaAlAlSiO₆. It is the fully aluminian member. The formula of kushiroite corresponds to the molecule (or component) known as Calcium-Tschermak (Ca-Tschermak), which dominates in the composition of kushiroite. Kushiroite is an aluminium-analogue of other pyroxene-group members, davisite, esseneite, and grossmanite. It was found in a chondrite meteorite within refractory inclusions.[1][2]

References

Kimura, M., Mikouchi, T., Suzuki, A., Miyahara, M., Ohtani, E., and El Goresy, A., 2009, Kushiroite, CaAlAlSiO6: A new mineral of the pyroxene group from the ALH 85085 CH chondrite, and its genetic significance in refractory inclusions. American Mineralogist 94(10), 1479-1482.
"Kushiroite: Kushiroite mineral information and data". Mindat.org. Retrieved 2016-03-02.

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[1] Kimura, M., Mikouchi, T., Suzuki, A., Miyahara, M., Ohtani, E., and El Goresy, A., 2009, Kushiroite, CaAlAlSiO6: A new mineral of the pyroxene group from the ALH 85085 CH chondrite, and its genetic significance in refractory inclusions. American Mineralogist 94(10), 1479-1482.

[2] "Kushiroite: Kushiroite mineral information and data". Mindat.org. Retrieved 2016-03-02.