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The 13 single-crystal adiabatic elastic moduli ( C  ij ) of a  C 2 /c  jadeite sample close to the ideal composition (NaAlSi 2 O 6 ) and a natural  P 2 /n  diopside-rich omphacite sample have been measured at ambient condition by Brillouin spectroscopy. The obtained  C  ij  values for the jadeite sample are:  C  11  = 265.4(9) GPa,  C  22  = 247(1) GPa,  C  33  = 274(1) GPa,  C  44  = 85.8(7) GPa,  C  55  = 69.3(5) GPa,  C  66  = 93.0(7) GPa,  C  12  = 84(1) GPa,  C  13  = 66(1) GPa,  C  23  = 87(2) GPa,  C  15  = 5.4(7) GPa,  C  25  = 17(1) GPa,  C  35  = 28.7(6) GPa,  C  46  = 14.6(6) GPa. Voigt-Reuss-Hill averaging of the  C  ij  values yields aggregate bulk modulus  KS  = 138(3) GPa and shear modulus  G  = 84(2) GPa for jadeite. Systematic analysis combing previous single-crystal elasticity measurements within the diopside-jadeite solid solution indicates that the linear trends are valid for most  C  ij  values. The  v  p  and  v s of omphacite decrease with diopside content, though the velocity changes are small as diopside component exceeds 70%. We also found that both the isotropic  v  p  and  v s, as well as the seismic anisotropy of eclogite, changed strongly with the bulk-chemical composition. The relationship between the anisotropic velocities of eclogite and the chemical composition can be a useful tool to trace the origin of the eclogitic materials in the Earth’s mantle.

american mineralogist

The single-crystal elastic properties of the jadeite-diopside solid solution and their implications for the composition-dependent seismic properties of eclogite