Fluorspar is a MINERAL composed of calcium fluoride, and is the most important source of fluorine. It is also known as fluorite, and is found in many parts of the world. Fluorspar has a wide variety of uses, including in the production of steel, aluminum, glass, and enamels. It is also used in the production of hydrofluoric acid, which is used in the manufacture of refrigerants, pharmaceuticals, and other chemicals.