Single-crystal elasticity of diopside to 14GPa by Brillouin scattering

•The single-crystal elasticity of diopside was measured to 14GPa.•A dense high-quality velocity data set was obtained with Brillouin spectroscopy.•First high-pressure experimental data on single-crystal elasticity of diopside.•Results are in very good agreement with previous ultrasonic measurements.•The acoustic anisotropy of diopside calculated from the single-crystal moduli can explain the anisotropy of eclogitic rocks.