Is limestone the common name for calcium carbonate?

No it's not. Limestone is a sedimentary rock made up of the shells of ancient organisms like corals or molluscs. Since calcium carbonate is the major constituent of shells, limestone contains a lot of calcium carbonate along with other minerals. read more

Limestone" means any rock formed mostly of calcium carbonate (CaCO3), but to geologists, limestone is only one of several types of"carbonate rocks." These rocks are composed of more than 50% carbonate minerals, generally the minerals. calcite (pure CaCO3) or dolomite (calcium-magnesium carbonate, CaMg[CO3]2) or both. read more

Calcium carbonate is a chemical compound with the formula Ca C O 3. It is a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone, which is a type of sedimentary rock build mainly of calcite) and is the main component of pearls and the shells of marine organisms, snails, and eggs. read more