Calcite Raman spectrum. From: Farsang, S., Facq, S. and Redfern, S.A., 2018. Raman modes of carbonate minerals as pressure and temperature gauges up to 6 GPa and 500 C. American Mineralogist: Journal of Earth and Planetary Materials, 103(12), pp.1988-1998.

Raman spectrum of calcite collected at ambient pressure (1 bar) and temperature (25 ˚C). From: Farsang, S., Facq, S. and Redfern, S.A., 2018. Raman modes of carbonate minerals as pressure and temperature gauges up to 6 GPa and 500 C. American Mineralogist: Journal of Earth and Planetary Materials, 103(12), pp.1988-1998.