Single crystals of San Carlos olivine have been pressurized to 2.0-3.0 GPa, 1200 °C and retrieved with few or no cracks from piston-cylinder apparatus. Graphite plugs with the same dimensions as the crystals (2.28-mm outside diameter, 1.27 mm thick) were placed above and below the crystals inside the capsules and apparently compensate stresses produced during depressurization and quenching. Specimens were depressurized and cooled at rates of 100-200 MPa/min and 100-150 °C/min, respectively. Cooling rate is a major factor controlling crack formation.

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