Calcium carbonate is a kind of chemical compound popularly known as limestone. Its compound formula is CaCO3. This compound is found mostly in ancient rocks and seashells in nature. Although calcium carbonate is a member of antacids, excess of it is biologically harmful. The most abundant known rocks of calcium carbonate in nature are aragonite, calcite, vaterite, chalk, limestone, marble and travertine. Hydrochloric acid or sulfuric acid is used to detect the presence of calcium carbonate on a rock.
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