Calcium Carbonate Is the chemical compound with formula CACO3 , It Is Common substance found in rocks as minerals calcite and aragonite Most notably as lime stone which Is a type of sedimentary rocks consisting mainly of calcite and Is the main component of eggshells gastropod shells shellfish skeletons and pearls calcium carbonate Is the active ingredient in agricultural lime and is created when calcium ions in hard water react with carbonate ions to create limescale . And its used in the production of 1- Paints and cement putty 2- Soap 3- Foam Mattresses 4- Forage 5- Ceramic 6- Paper 7- porcelain