Calcium Fluorite (also called fluorspar) is the mineral, CaF₂. It crystallizes in isometric cubic habit , although octahedral and more complex isometric forms are not uncommon.

Fluorite is a colorful mineral, both in visible and ultraviolet light, and the stone has ornamental uses. Industrially, fluorite is used as a flux for smelting, and in the production of certain glasses and enamels. The purest grades of fluorite are a source of fluoride                 for hydroflouricacid manufacture, which is the intermediate source of most fluorine-containing fine chemical. Optically clear transparent fluorite lenses have low dispersion, so lenses made from it exhibit less chromatic abbration, making them valuable in microscopes and telescopes. Fluorite optics are also usable in the far-ultraviolet range, where conventional glasses are too absorbent for use.