What is Calcium Carbonate? (with pictures) - wiseGEEK
4/8/2020· Calcium carbonate is an important chemical compound made up of one atom of calcium bonded to one atom of carbon and three atoms of oxygen. Its molecular formula is CaCO 3 . Common names for this compound include limestone , calcite , aragonite, chalk, and marble, and while all contain the same substance, each has different processes underlying its formation.