Fluorite is a halide mineral (calcium fluoride) found as a common gangue mineral in hydrothermal veins, especially those containing lead and zinc minerals. It is also found in cavities in sedimentary rocks; as a cementing material in sandstones; and as hot springs deposits.
Fluorite forms isometric crystals, usually cubes, less often octahedrons, and rarely dodecahedrons. Also some hexoctahedrons and tetrahexahedrons. Combinations of these forms are common.
The color may be purple, lilac, golden-yellow, green, colourless, blue, pink, champagne, or brown.