Apatite is a group of phosphate minerals with the chemical formula Ca₅(PO₄)₃(F,Cl,OH). It commonly occurs in green, yellow, blue, or brown colors, though it can also be found in other shades. Apatite is the primary source of phosphorus for fertilizers and is commonly used in the mining industry. In its crystalline form, apatite can be found in hexagonal prisms and is often used as a gemstone in jewelry. It has a Mohs hardness of 5, making it suitable for a variety of ornamental uses, though it is relatively soft compared to other gemstones. Major sources of apatite include Brazil, Mexico, Canada, and the United States.