CaCO3 is the chemical formula for calcium carbonate. It is considered the most important of all the calcium compounds. It can be found in nature in oyster shells and corals as well as limestone, chalks and marbles. It has many industrial uses, commonly as a filler in plastics and as a paint extender. Calcium carbonate is also used as a calcium supplement and an antacid. It will neutralize acid
. in both soil and water. For more information see http://en.wikipedia.org/wiki/Calcium_carbonate.
