Calcium is a chemical compound with the formula Ca. It is a common substance found in rocks as the minerals calcite and aragonite. It is also the main component of shells of marine organisms, snails, pearls, and eggshells. Calcium carbonate is one of the most widely used substances on Earth due to its various applications in industry and everyday life. molecular-structure-calcium-... https://sukhmaniimpex.com/calcium-carbonate/