Fluorite

Fluorite, or fluorspar, common mineral composed mainly of calcium fluoride. Fluorite is mined in many parts of the world and is important as a flux in the iron and steel industries. It is sometimes used in making optical lenses and as a catalyst in the manufacture of high-octane fuels. Fluorite is found in a wide range of colors, including light green, yellow, blue-green, purple, and, rarely, pink and red.