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The hydrostatic compression of synthetic single crystals of diopside, CaMgSi 2 O 6 , and hedenbergite, CaFeSi 2 O 6 , was studied at 33 pressures up to 10 GPa by X-ray diffraction. In addition, intensity data for hedenbergite were collected at 12 pressures up to 10 GPa. For determination of the elasticity two crystals were loaded together in a diamond cell. The axial compressibilities β a , β b , and β c  of diopside and hedenbergite are 2.36(4), 3.17(4), and 2.50(4) × 10 -3  GPa -1 , and 1.93(5), 3.38(6), and 2.42(8) × 10 -3  GPa -1 , respectively. The bulk moduli (K T₀ ) and their pressure derivatives (K′ T₀  ) were determined simultaneously from a weighted linear fit of a third order Birch-Murnaghan equation of state to the volume data at elevated pressures. K T₀  and K′ T₀  are 104.1(9) GPa and 6.2(3) for diopside and 117(1) GPa and 4.3(4) for hedenbergite, respectively.

Single-crystal compression and crystal structure of clinopyroxene up to 10 GPa