mineral

Fluorite on Matrix

Calcium Fluoride (CaF2)

Hardness: 4 on Mohs scale; Color: Multi-colored (blue, green, purple); Luster: Vitreous/Glassy; Crystal structure: Isometric (cubic/octahedral cleavage); Perfect four-directional cleavage.

Hardness: 4 on Mohs scale
Color: Multi-colored (blue, green, purple)
Luster: Vitreous/Glassy

Identified July 20, 2026More mineral →

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Physical properties

Hardness: 4 on Mohs scale; Color: Multi-colored (blue, green, purple); Luster: Vitreous/Glassy; Crystal structure: Isometric (cubic/octahedral cleavage); Perfect four-directional cleavage.

Formation & geological history

Formed in hydrothermal veins often as a gangue mineral associated with metallic ores. Occurs via precipitation from hot, mineral-rich underground fluids as they cool in rock fractures.

Uses & applications

Used as a flux in steel making, in the production of hydrofluoric acid, in high-precision optical lenses, and as a popular collector's mineral.

Geological facts

Fluorite is the origin of the term 'fluorescence' because many specimens glow under ultraviolet light. It is often referred to as 'the most colorful mineral in the world'.

Field identification & locations

Identify by its relatively low hardness (can be scratched by a knife but not a penny) and its distinct cubic crystal habits or octahedral cleavage fragments. Usually found in vein deposits or limestone cavities.