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Calcium carbonate is an inorganic compound with the chemical formula CaCO₃, commonly known as limestone, limestone, stone powder, marble, etc. Calcium carbonate is alkaline, basically insoluble in water, soluble in hydrochloric acid. It is one of the common substances on earth and exists in aragonite, calcite, chalk, limestone, marble, travertine and other rocks, and is also the main component of animal bones or shells. Calcium carbonate is a high quality calcium nutrient fortification agent, which is widely used in food field.