mineral

Fluorite on Matrix

Calcium Fluoride (CaF2)

Hardness: 4 on Mohs scale; Color: Purple, green, and clear; Luster: Vitreous (glassy); Crystal structure: Isometric (cubic); Cleavage: Perfect octahedral in four directions; Specific Gravity: 3.175 to 3.56.

Hardness: 4 on Mohs scale
Color: Purple, green, and clear
Luster: Vitreous (glassy)

Identified July 17, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal activity, often in veins or as a gangue mineral in metallic ore deposits. This specimen appears to be from a sedimentary host rock origin, likely formed in a low-temperature hydrothermal environment.

Uses & applications

Used primarily as a flux in steel making, in the production of hydrofluoric acid, as a source of fluorine, and as a popular semi-precious gemstone for decorative carvings and jewelry.

Geological facts

Fluorite is the mineral from which the phenomenon of fluorescence was named, as many specimens glow strongly under ultraviolet light. It is often called the most colorful mineral in the world.

Field identification & locations

Identified by its octahedral cleavage, its relatively low hardness (can be scratched by a knife but not a penny), and its vibrant purple hues when associated with limestone or quartz matrix. Commonly found in Illinois (USA), China, and Mexico.