mineral

Rainbow Fluorite

Calcium Fluoride (CaF2)

Hardness: 4 on Mohs scale; Color: Multi-colored bands of purple and teal/green; Luster: Vitreous; Crystal structure: Isometric (cubic); Cleavage: Perfect octahedral; Specific gravity: 3.175–3.56.

Hardness: 4 on Mohs scale
Color: Multi-colored bands of purple and teal/green
Luster: Vitreous

Identified July 14, 2026More mineral →

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Physical properties

Hardness: 4 on Mohs scale; Color: Multi-colored bands of purple and teal/green; Luster: Vitreous; Crystal structure: Isometric (cubic); Cleavage: Perfect octahedral; Specific gravity: 3.175–3.56.

Formation & geological history

Formed in hydrothermal veins, often associated with metallic ores like lead and silver. It precipitates from hot, mineral-rich fluids passing through rocks. Most specimens are from the Phanerozoic eon.

Uses & applications

Used as a flux in steel making, in the production of hydrofluoric acid, high-performance telescope lenses, and widely as a decorative gemstone or carving material.

Geological facts

Fluorite was the first mineral discovered to exhibit fluorescence under UV light, a property named after the mineral itself. It is often called 'the most colorful mineral in the world.'

Field identification & locations

Identified by its distinctive color zoning and its relative softness (scratched by a knife but not a copper penny). Common in China, Mexico, and South Africa. For collectors, look for distinct color banding and octahedral cleavage planes.