Calcite

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison.

Large calcite crystals are used in optical equipment, and limestone composed mostly of calcite has numerous uses.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 4.0

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