Name   Specific_Gravity   Smallest_RI   Largest_RI   Birefringence   Hardness
calcite   2.72   1.486   1.658   0.172   3
magnesite   2.98   1.509   1.7   0.17   4
rhodochrosite   3.7   1.597   1.816   0.219   3.7
siderite   3.96   1.635   1.875   0.24   4.3
dolomite   2.86   1.5   1.679   0.179   3.7
aragonite   2.94   1.53   1.685   0.155   3.7
strontianite   3.72   1.518   1.667   0.15   3.5
witherite   4.3   1.529   1.677   0.148   3.3
cerussite   6.57   1.803   2.076   0.275   3
azurite   3.77   1.73   1.838   0.108   3.7
smithsonite   4.43   1.625   1.85   0.227   4.2