Calcium Carbonateis a common substance found in rocks in all parts of the world. Calcium Carbonate is the main component of shells of marine organisms, snails, pearls and eggshells. Active ingredient in agricultural lime, Calcium Carbonate is the principal cause of hard water. Moreover, Calcium Carbonate is used medicinally as a calcium supplement or as an antacid and in the cement industry to add strength to the structure. Used In Pharmaceutical Cement Industry Grade Lime GradeBrick Grade