Aragonite is a mineral that is commonly found in sedimentary rocks, and is formed from the precipitation of calcium carbonate in various environments. This is a twinned Aragonite cluster and is usually found in shades of white, but can also be found in other colors such as blue, green, and brown. Aragonite was first discovered in the village of Molina de Aragón, Spain in the 18th century, and was named after the location of its discovery.