Calcite Blue

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It is a common constituent of sedimentary rocks, limestone in particular, much of which is formed from the shells of dead marine organisms. Approximately 10% of sedimentary rock is limestone. It is the primary mineral in metamorphic marble. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 3 as "calcite" and its luster is vitreous in crystallized varieties. Other polymorphs of calcium carbonate are the minerals aragonite and vaterite. Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 °C,^[5][6] and vaterite is even less stable. Color is white or none, though shades of gray, red, orange, yellow, green, blue, violet, brown, or even black can occur when the mineral is charged with impurities. Calcite is transparent to opaque and may occasionally show phosphorescence or fluorescence.

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