mineral

Polished rainbow fluorite slice

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Typically translucent with vivid purple, green, blue, and banded zoning; vitreous luster and cubic crystal structure, though this cut slice has no visible crystal faces. Mohs hardness 4, perfect octahedral cleavage, and specific gravity about 3.18.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and replacement deposits when fluorine-rich fluids circulate through carbonate or igneous rocks; specimens commonly date from relatively young to Paleozoic hydrothermal systems. The rainbow coloration reflects trace elements, radiation effects, and growth zoning.

Uses & applications

Used as a flux in steel and aluminum production, in hydrofluoric-acid manufacture, and occasionally as an ornamental or lapidary material. Attractive polished slices are popular for displays and mineral collections.

Geological facts

Fluorite is famous for strong fluorescence under ultraviolet light, often glowing blue, purple, or green. The specimen appears cut and polished, with natural curved/banded growth zones emphasized by the finish.

Field identification & locations

Identify by vivid color zoning, glassy luster, relatively low hardness, cubic cleavage, and UV fluorescence; avoid confusing it with dyed agate or glass. Major sources include China, Mexico, England, the United States, and South Africa.