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Dissolution of pyroxene in garnet at ultrahigh pressures produces supersilicie garnet with the coupled substitutions of Si^Ⅵ + M^Ⅵ= A^Ⅵ + A^Ⅵ and Si^Ⅵ + Na^Ⅷ=A^Ⅵ + M^Ⅷ,which are enhanced by rising pressure. The supersilicic garnet and exsolution of pyroxe