| rdfs:comment
| - Post-perovskite is a high-pressure phase of MgSiO3, is composed of the prime oxide constituents of the Earth's rocky mantle (MgO and SiO2), and its pressure and temperature for stability imply that it is likely to occur in portions of the lowermost few hundred km of Earth's mantle. MgSiO3 has the same crystal structure as the synthetic solid compound CaIrO3, and is often referred to as the "CaIrO3-type phase of MgSiO3" in the literature. The crystal system of post-perovskite is orthorhombic, its space group is Cmcm, and its structure is a stacked SiO6-octahedral sheet along the b axis. The name "post-perovskite" derives from the name of the stable phase of MgSiO3 throughout most of Earth's mantle, termed perovskite. The prefix "post-" refers to the fact that it occurs after perovskite as p
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| abstract
| - Post-perovskite is a high-pressure phase of MgSiO3, is composed of the prime oxide constituents of the Earth's rocky mantle (MgO and SiO2), and its pressure and temperature for stability imply that it is likely to occur in portions of the lowermost few hundred km of Earth's mantle. MgSiO3 has the same crystal structure as the synthetic solid compound CaIrO3, and is often referred to as the "CaIrO3-type phase of MgSiO3" in the literature. The crystal system of post-perovskite is orthorhombic, its space group is Cmcm, and its structure is a stacked SiO6-octahedral sheet along the b axis. The name "post-perovskite" derives from the name of the stable phase of MgSiO3 throughout most of Earth's mantle, termed perovskite. The prefix "post-" refers to the fact that it occurs after perovskite as pressure increases (and historically, the progression of high pressure mineral physics). At upper mantle pressures, nearest Earth's surface, MgSiO3 persists as enstatite, a mineral which can be found in natural rocks.
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