Calcite : CaCO3 Refractive Index : 1.66-1.74 Specific Gravity : 2.71 Mohs Hardness : 3 Aragonite : CaCO3 Refractive Index : 1.68-1.69 Specific Gravity : 2.95 Mohs Hardness : 3.5-4 The mineral calcite is the major or sole constituent of most commercial calcium carbonate products. These include natural limestone, marble, and chalk, plus most precipitated calcium carbonate. Aragonite is a metastable polymorph of calcite that typically has an acicular crystal shape. Natural aragonite products are less common, but precipitated varieties are available. Many calcium carbonate deposits are the remains of the shells and skeletons of ancient sea life. The color, purity, density, and crystal morphology depend upon the influence of waves and water currents before burial, and upon temperature, pressure, and tectonic activity after burial. The most common mineral impurities are quartz and clay. The m
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