Aragonite is a mineral form of calcium carbonate, with the chemical formula CaCO3. It is commonly found in marine environments, forming in the shells of mollusks and the skeletons of corals. Aragonite has a unique crystal structure that makes it different from its more stable counterpart, calcite. This mineral plays a significant role in the carbon cycle and is important for the formation of limestone and other sedimentary rocks. Aragonite can also be used in various industrial applications, including as a filler in plastics and as a source of calcium in agriculture.