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Page: 1 2 What is calcium carbonate? Calcium carbonate is a simple compound with the chemical formula CaCO3. In nature this occurs as a mineral found in three distinct crystalline forms. Although these are identical in chemical terms they differ in many other respects. Chalk is a fine, microcrystalline sedimentary rock which has been produced by the sedimentation of the shells of small fossilised creatures such as coccoliths and foraminifers. We obtain chalk at numerous sites along the European chalk belt - from the United Kingdom through France all the way to the island of Rügen in north Germany. Limestone is also a biogenic rock, but it is more compacted than chalk. The rock was in fact formed by snails and shells. The size of the crystals is between that of chalk and marble. We quarry limestone from the large deposits in Orgon (France) and Burgberg (Germany).