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The single-crystal elastic moduli of natural samples of both calcite (CaCO 3 ) and rhodochrosite (MnCO 3 ) have been measured by Brillouin spectroscopy under ambient condition. Based on the trigonal unit cell, the elastic constants C 11 , C 33 , C 44 , C 12 , C 13 , and C 14  are 149.4(7), 85.2(18), 34.1(5), 57.9(11), 53.5(9), -20.0(2), and 223.9(15), 132.6(41), 44.5(9), 93.4(21), 76.0(23), -17.3(6) GPa for CaCO 3  and MnCO 3 , respectively. Our data for calcite are in good agreement with earlier data obtained by ultrasonic experiments. The off-diagonal elastic constants (C 12 , C 13 , and C 14 ) for rhodochrosite have systematically larger values than the trend defined by other isostructural carbonates, in all of which the divalent cations are alkaline-earth metals. This is a distinctive signature of transition- metal-bearing oxides, which is present in silicates and simple oxides as well.

Letters. Elasticity of single-crystal calcite and rhodochrosite by Brillouin spectroscopy