Formula: CaAlAlSiO6
Inosilicate (chain silicate), clinopyroxene subgroup,
pyroxene group, approved in 2008
Crystal System: Monoclinic
Environments:
Derived from the Earth's mantle
Meteorites
Localities
The type locality is the Allan Hills 85085 meteorite (ALH 85085), Allan Hills, Victoria Land, Eastern Antarctica.
This is
a carbonaceous chondrite meteorite, where
kushiroite is associated with other
pyroxenes and grossite
(Mindat).
There is no obvious evidence for impact in this inclusion. It is suggested that metastable crystallisation of this
pyroxene took place from refractory melts in the solar nebula. Coexisting
grossite-bearing refractory inclusions in the type specimen show
26Mg excesses with inferred initial 26Al to 27Al ratios between 2.1 × 10−6 to
3.9 × 10−5, providing evidence that condensation, melting, and crystallisation took place in the solar nebula when
26Al was still extant
(AM 94.1479–1482).
At the Mriya lamproite pipe, Berdyansk Raion, Zaporizhia Oblast, Ukraine, some highly reduced phases and associated
silicates have been found in inclusions within corundum grains. These
phases may provide valuable insights into deep
Earth processes and their surface occurrences. Minerals found at this locality include kushiroite,
osbornite, wassonite, and
wodegongjieite
(SEMONOVA, KARINA (2025) Investigation of corundum inclusions containing Highly Reduced Mineral Phases in the
Mriya Pipe (Ukraine): Insights into Deep Earth Processes).
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