Images
Formula: FeSiO3
Inosilicate (chain silicate), paramorph of
clinoferrosilite,
ferrosilite, hemleyite and
pyroxferroite, the Fe analog of
bridgmanite, which is considered to be the most abundant mineral in the
Earth's lower mantle.
Crystal System: Orthorhombic
Environments
Hiroseite is a relatively new mineral, approved in 2019 and to date (July 2024) reported only from the
type locality.
Localities
At the type locality, the Suizhou meteorite, Xihe, Zengdu District, Suizhou, Hubei, China, hiroseite was
found in the shock vein of the heavily shocked (75 to 90 GPa) low-iron
chondrite meteorite. It occurs in a quenched shock melt as
iron-rich segregation consisting of hiroseite grains up to 8 µm in a
matrix of iron-bearing
periclase, mantled by a rim of
ringwoodite-ahrensite solid
solution. The shock melt pocket is surrounded by forsterite. Other
associated minerals are pyroxene,
taenite, troilite and
MgSiO3 glass. The textures and compositions suggest hiroseite resulted from the transformation of
a chemically zoned olivine. The
fayalite-rich core transformed to hiroseite and
iron-rich periclase, while the
magnesium-rich rim transformed to
ringwoodite-ahrensite
(AM 105.1921).
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