mineral

Fluorite

Calcium Fluoride (CaF2)

Hardness: 4 on Mohs scale; Color: typically purple, green, or blue in light-colored hues; Luster: Vitreous; Crystal system: Isometric/Cubic; Cleavage: Perfect octahedral; Specific gravity: 3.17 to 3.56.

Hardness: 4 on Mohs scale
Color: typically purple, green, or blue in light-colored hues
Luster: Vitreous

Identified June 8, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through hydrothermal activity in sedimentary or igneous environments. It often occurs as a gangue mineral in metal ores, particularly with lead and silver veins. Most specimens are from the Phanerozoic eon.

Uses & applications

Used as a flux in steel making, in the manufacture of opalescent glass, as an enamel for cooking utensils, and for hydrofluoric acid production. High-clear specimens are used in telescope optics. Very popular in gemstone carving and lapidary art.

Geological facts

Fluorite exhibits the property of fluorescence under UV light, a term which was actually named after this mineral. It is often referred to as 'The Most Colorful Mineral in the World'.

Field identification & locations

Identified by its octahedral cleavage planes and its relatively low hardness (can be scratched by a pocket knife). Commonly found in Mexico, China, and the United States (Illinois). Collectors should look for distinct crystalline faces.