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Synchrotron-based high-pressure single-crystal X-ray diffraction experiments were conducted on synthetic pure clinoferrosilite, Fe 2 Si 2 O 6 , at room temperature to a maximum pressure of 45 GPa. In addition to the previously described  P 2 1 / c  →  C 2/ c  phase transition between 1.48 and 1.75 GPa ( Hugh-Jones et al. 1994 ), we observe further transition between 30 and 36 GPa into the high-pressure P2 1 /c phase (HP- P 2 1 / c ). The  C 2/ c  → HP- P 2 1 / c  transition is induced by rearrangement of half of the layers of corner-sharing SiO 4  tetrahedra into layers of edge-sharing SiO 6  octahedra. The new configuration of  VI Si layers suggests a possibility of a progressive transformation of the pyroxene into an ilmenite-type structure. The persistence of metastable pyroxene up to pressures higher than expected and its feasible direct transformation to ilmenite are of special interest for understanding the dynamics of cold-subducting slabs. We report on structural and compressibility features of both high-pressure phases as well as address thermal stability of HP- P 2 1 / c .

A new high-pressure phase transition in clinoferrosilite: In situ single-crystal X-ray diffraction study