The elastic constants of single-crystal orthopyroxene

摘要: The elastic constants of a very small orthopyroxene gem (1.9 grams) the bronzite variety (density 3.335 g/cc) was measured by pulse superposition method. adiabatic stiffness in Mb at room temperature and 1 atm pressure are: c11 = 2.299, c22 1.654, c33 2.057, c44 0.8306, c55 0.7637, c66 0.7853, c23 0.496, c31 0.573, c12 0.701. Using Voigt-Reuss-Hill average, dilational wave velocity is 7.85 km/sec, shear 4.76 bulk modulus 1.050 Mb, rigidity 0.755 Poisson's ratio 0.21. In contrast with properties clinopyroxenes, axis this crystal elastically most stiff direction, showing maximum minimum linear compressibility. anisotropy waves 126 or 17%, which comparable to 18% for olivine.