Where are carbonates found?

In chemistry, a carbonate is a salt of carbonic acid (H2CO3),[2] characterized by the presence of the carbonate ion, a polyatomic ion with the formula of CO2− 3. read more

Calcium carbonate, or CaCO3, comprises more than 4% of the earth’s crust and is found throughout the world. Its most common natural forms are chalk, limestone, and marble, produced by the sedimentation of the shells of small fossilized snails, shellfish, and coral over millions of years. read more

Calcium carbonate. Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone, which contains both of those minerals) and is the main component of pearls and the shells of marine organisms, snails, and eggs. read more