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The D′′ region that lies just above the core mantle boundary exhibits complex anisotropy that this is likely due to preferred orientation (texturing) of the constituent minerals. (Mg,Fe)SiO3 post-perovskite is widely thought to be the major mineral phase of the D′′. Texture development has been studied in various post-perovskite phases (MgSiO3, MgGeO3, and CaIrO3), and different results were obtained...
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