mineral

Fluorite (Rainbow Fluorite)

Fluorite (Calcium Fluoride, CaF2)

Hardness: 4 on Mohs scale; Color: Multi-colored bands (purple, green, clear, blue); Luster: Vitreous; Crystal Structure: Isometric (cubic); Cleavage: Perfect octahedral; Specific Gravity: 3.175–3.184.

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

Identified April 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal activity where hot, mineral-rich fluids circulate through crustal fractures. Often found in vein deposits or limestone cavities (vugs). Most specimens range from a few million to hundreds of millions of years old.

Uses & applications

Used as a flux in steel and aluminum processing, to produce hydrofluoric acid, in high-performance optical lenses, as a gemstone for jewelry, and as a popular decorative specimen for collectors.

Geological facts

Fluorite is the origin of the term 'fluorescence' because many specimens glow under UV light. It is often called 'The Most Colorful Mineral in the World' because it occurs in every color of the rainbow.

Field identification & locations

Identify in the field by its distinct cubic crystal habit, perfect cleavage, and relative softness (can be scratched by a steel knife but not a copper penny). Commonly found in China, Mexico, and Illinois (USA).

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