Calcium Carbonate is a chemical compound with the chemical formula CaCO3. It is a common substance found in rock in all parts of the world, and is the main component of shells of marine organisms, snails, pearls, and eggshells. Calcium Carbonate is the active ingredient in agricultural lime, and is usually the principal cause of hard water. It is commonly used medicinally as a calcium supplement or as an antacid, but excessive consumption can be hazardous.
The vast majority of Calcium Carbonate used in industry is extracted by mining or quarrying. Pure Calcium Carbonate (e.g. for food or pharmaceutical use), can be produced from a pure quarried source (usually marble).