Silicate pyroxenes, amphiboles, and micas are important components in the Earth’s crust, upper mantle, and in meteorites (Ringwood 1975, Anderson 1989). A detailed knowledge of crystal structures and phase-transition mechanisms in these minerals is, therefore, of great geophysical importance in understanding planetary interiors. The first crystal structure investigation of a pyroxene was reported by Warren and Bragg (1928) who solved the monoclinic C2/c diopside structure. Warren and Modell (1930) solved the structure of orthorhombic Pbca hypersthene, and the monoclinic P21/c pyroxene was predicted by Ito (1950), who postulated that Pbca...

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