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02.2_Perovskite
General perovskite structure. Perovskite silicates (i.e.
Bridgmenite,
(Mg,Fe)SiO3) are thought to be the main component of the lower mantle, making it the most common mineral in or on Earth.
By Cadmium at English Wikipedia (Transferred from en.wikipedia to Commons.) [Public domain], via Wikimedia Commons