Aragonite is a carbonate mineral, one of the two common, naturally occurring polymorphs of calcium carbonate. Aragonite, pronounced uh-RAG-oh-nite, is also known as tufa and tchazar crystal. It was named for the place of its discovery in Aragon, Spain, but Aragonite can be found all over the world.
Aragonite stone is a carbonated metamorphous gemstone naturally found in stalactites or around natural hot springs. Another source of aragonite stone can be found in the mother-of-pearl lining of mollusk shells. The crystal structure of aragonite acts like a prism because it is orthorhombic, meaning it has three triangular sides.