mineral

Tumbled blue-green fluorite (probable)

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

Translucent teal-blue to green color, vitreous luster, rounded by tumbling, and visible internal fractures or veils. Fluorite has Mohs hardness 4, cubic crystal structure, perfect octahedral cleavage, and specific gravity about 3.18; the image alone cannot exclude dyed glass or another tumbled mineral.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms chiefly in hydrothermal veins and cavities associated with limestone, granite, and other host rocks, commonly with quartz, calcite, and sulfides. Deposits range from Paleozoic to Cenozoic age.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of fluorine; attractive pieces are sold as ornamental or lapidary specimens. Tumbled examples commonly have modest value.

Geological facts

Fluorite can fluoresce strongly under ultraviolet light, often blue, purple, or green. Its softness and cleavage make it prone to scratches and edge damage.

Field identification & locations

Common localities include China, Mexico, Illinois and Kentucky, USA, England, and Spain. Confirm with a hardness test, specific gravity, UV response, and inspection for cubic cleavage; glass is harder and lacks cleavage.