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Three natural olivines with Fo 80 Fa 20 , Fo 71 Fa 29 , and Fo 62 Fa 38  compositions were investigated in situ at high pressure by single-crystal X‑ray diffraction using a diamond-anvil cell up to -8 GPa at room temperature. The bulk modulus, K T0 , and its first pressure derivative, K′, do not show any significant variation among the compositions investigated and, using the data on a further sample with Fo 92 Fa 8  composition recently investigated in the same laboratory and using the same experimental technique, we obtain, for the first time, a single equation of state for the entire Fo 92 Fa 8 -Fo 62 Fa 38  compositional range. The equation has the following coefficients: K T0  = 124.7(9) GPa and K′ = 5.3(3) and can be used for thermodynamic calculations involving the most common mantle olivine compositions.

New accurate elastic parameters for the forsterite-fayalite solid solution