Calcite Wikipedia
Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO 3).The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 3 as quot;calcitequot;.. Other polymorphs of calcium carbonate are the minerals aragonite and will change to calcite over timescales of days or less at temperatures exceeding 300 #176;C, and vaterite is even