Calcium carbonate exists in an odourless, white crystalline powder that is found in rocks and shells of various living organisms. It is insoluble in water but soluble in acids. The common forms of calcium carbonate exists as chalk, limestone, and marble. Calcium carbonate is a highly versatile material and has a wide variety of applications.
Most industrial calcium carbonate is extracted by mining or quarrying. Pure form of calcium carbonate can be produced from pure quarried sources such as marble. To manufacture calcium carbonate, water is added to calcium oxide to give calcium hydroxide and carbon dioxide. The latter is then passed through the former to precipitate calcium carbonate.