mineral

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Hardness: 4 on the Mohs scale; Color: Multi-colored bands of purple, green, blue, and clear; Luster: Vitreous (glassy); Crystal Structure: Isometric/Cubic with perfect octahedral cleavage; Specific Gravity: 3.175–3.184.

Hardness: 4 on the Mohs scale
Color: Multi-colored bands of purple, green, blue, and clear
Luster: Vitreous (glassy)

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal activity where mineral-rich hot water flows through fractures in rocks (often limestone or dolostone). It can form at various geological ages, commonly found in veins or as a gangue mineral in metallic ore deposits.

Uses & applications

Primarily used as a flux in steel making, in the manufacture of hydrofluoric acid, and for high-performance camera lenses. This specific specimen is shaped for ornamental use, metaphysical collecting, and interior decor.

Geological facts

Fluorite is the most colorful mineral in the world. It is also the origin of the term 'fluorescence,' as many specimens glow under UV light due to impurities in the crystal lattice. The unique 'rainbow' banding is caused by changes in the trace element impurities during the crystal's growth.

Field identification & locations

Identify in the field by its distinct cubic crystal habit, octahedral cleavage, and softness (it can be scratched by a steel knife but not a copper penny). Common locations include China, Mexico, South Africa, and the USA (Illinois/Kentucky). Collector tips: check for fluorescence and avoid long exposure to sunlight which can fade colors.