Calcium carbonate is a chemical compound with the formula CaCO3. Its molar mass is 100.0869 grams per mole. It is a solid white powder, and it has no odor. It has a low solubility in water of 0.0013 grams per 100 milliliters at 25 degrees Celsius.
Calcium carbonate is a common constituent of rocks on Earth, and it is the main component of the shells of marine animals and snails. It releases carbon dioxide in reaction with strong acids. It decomposes into carbon dioxide and calcium oxide when heated up to temperatures above 1,544 degrees Fahrenheit. It is industrially obtained from the reactions of calcium oxide with water and carbon dioxide, with calcium hydroxide as an intermediary.