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High pressure phase transformation of jadeite and stability of NaAlSiO4 with calcium‐ferrite type structure in the lower mantle conditions

Phase transformation of Jadeite clinopyroxene was studied at temperatures of 800 and 2200 °C at pressures between 30–75 GPa in externally electrically heated and internally laser‐heated diamond anvil cells. It has been found that Jadeite transforms to the assemblage of NaAlSiO4 (calcium‐ferrite type structure) plus stishovite at high pressure and temperatures. Therefore NaAlSiO4 calcium‐ferrite is stable at the deep lower mantle pressure and temperature conditions.