Aragonite is a calcium carbonate mineral with the same chemical formula as calcite but with a slightly different crystal structure. It occurs in several colours and is formed at low temperatures close to the surface of the earth, in caves as stalactites and around hot springs.
It was first named in 1797 after the village of Molina de Aragón in Spain and some of the finest specimens still come from there. Aragonite is the main component of coral, pearl and the shells of many marine molluscs.
This uniquely shaped white aragonite crystal formation is slightly translucent with a vitreous lustre. It's important to note that it's soft and brittle so must be handled with care. On Mohs scale of mineral hardness aragonite grades 3.5 to 4.