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Phase transformations in natural serpentine and chlorite have been studied at 25–50GPa and 900–1280°C by in-situ X-ray diffraction measurements using the multianvil apparatus with sintered diamond anvils. Antigorite was found to transform to a phase assemblage including phase H, at pressures above about 35–40GPa corresponding to those in the upper part of the lower mantle. The zero pressure bulk modulus...