mineral

Fluorite

Calcium Fluoride (CaF2)

AI-generated identification · may be incorrect

Hardness: 4 on Mohs scale; Color: Purple and teal/green zones; Luster: Vitreous; Crystal system: Isometric (cubic); Cleavage: Perfect octahedral; Specific gravity: 3.18

Hardness: 4 on Mohs scale
Color: Purple and teal/green zones
Luster: Vitreous

Identified July 2, 2026More mineral →

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Physical properties

Hardness: 4 on Mohs scale; Color: Purple and teal/green zones; Luster: Vitreous; Crystal system: Isometric (cubic); Cleavage: Perfect octahedral; Specific gravity: 3.18

Formation & geological history

Commonly forms in hydrothermal veins, often as a gangue mineral associated with metallic ores. It can also occur in granites, pegmatites, and dolostones.

Uses & applications

Used as a flux for steelmaking and aluminum production, in the manufacture of hydrofluoric acid, in high-performance optical lenses, and as a popular semi-precious gemstone/ornamental stone.

Geological facts

Fluorite was the first mineral ever to be categorized as 'fluorescent' because many specimens glow under UV light. It is often called 'nature's most colorful mineral'.

Field identification & locations

Identify in the field by its distinct four directions of perfect cleavage and lower hardness (scratched by a steel knife but not a copper penny). This rough specimen shows the characteristic purple and translucent teal zoning common in 'Rainbow Fluorite'.