Aragonite is a carbonate mineral with the chemical formula CaCO₃, similar to calcite, but with a different crystal structure. It is typically found in prismatic crystals and can come in various colors, including white, yellow, brown, blue, and green. Aragonite forms in sedimentary and metamorphic environments and is often associated with limestone or marble deposits. It has a Mohs hardness of 3.5 to 4, making it relatively soft and more suitable for ornamental pieces and decorative carvings. Aragonite can be found in regions like Morocco, Spain, and the United States.