Raman spectrum of witherite taken at ambient pressure (1 bar) and temperature (25˚C). From: Farsang, S., Widmer, R.N. and Redfern, S.A.T., 2020. High-pressure and high-temperature vibrational properties and anharmonicity of carbonate minerals up to 6 GPa and 500 ˚C by Raman spectroscopy. Under review at American Mineralogist.