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What calicium carbonate??????

Calcium carbonate is a chemical compound with the formula CaAO₃. It is a common substance found in rocks in all parts of the world, and is the main component of shells of marine organisms, snails, coal balls, pearls, and egg shells. Calcium carbonate is the active ingredient in agricultural lime, and is created when Ca ions in hard water react with carbonate ions creating lime scale. It is commonly used medicinally as a calcium supplement or as an antacid, but excessive consumption can be hazardous.