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Calcium carbonate

Calcium carbonate, mineral (CaCO₃) abundant in nature. Limestone, marble, coral, calcite, and chalk have calcium carbonate as a main ingredient. Calcium carbonate is used in toothpaste, tooth powder, and stomach medicine. Stalactites and stalagmites that form in caves are made from water that deposited this white, crystalline mineral.

See also: Calcite; Chalk.

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