Elasticity of orthoenstatite

Abstract Elastic constants of orthoenstatite have been determined from Brillouin-scattering measurements. They are c 11 = 2.247, c 22 = 1.779, c 33 = 2.136, c 44 = 0.776, c 55 = 0.759, c 66 = 0.816, c 23 = 0.527, c 31 = 0.541 and c 12 = 0.724 Mbar. Each elastic constant is uniquely defined by the data. Acoustic velocities measured for two directions ultrasonically on the same samples are within 1% of those determined from Brillouin-scattering spectra.

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