Inosilicate (chain silicate), ilmenite group, paramorph of clinoferrosilite, ferrosilite and pyroxferroite
Specific gravity: 4.383 calculated
Hemleyite was approved as a mineral species in 2016, and to date (February 2021) has been reported only from
the type locality.
At the type locality, the Suizhou meteorite, Xihe, Zengdu District, Suizhou, Hubei, China, one subhedral crystal of hemleyite, about 7 × 6 × 5 μm in size, has been found, coexisting with forsterite, clinoenstatite and Fe-bearing pyroxene with a composition nearly identical to that of hemleyite. It is a high-pressure phase, discovered in an unmelted portion of the heavily shocked meteorite that was exposed to high pressures (<20 GPa) and temperatures (<2000 °C) during impact-induced shocks. This indicates that hemleyite could play a crucial role at the bottom of the Earth’s mantle transition zone and within the uppermost lower mantle (https://www.nature.com/articles/srep42674.pdf).
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