mineral

Tumbled fluorite

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Appears as a dark green, translucent, polished pebble with mottled internal zoning and vitreous-to-waxy luster. Hardness is Mohs 4; cubic crystal structure, perfect octahedral cleavage, and specific gravity about 3.18.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Fluorite forms in hydrothermal veins and cavities, commonly with quartz, calcite, and sulfide ores; specimens may range from Paleozoic to Cenozoic in age. This piece has been mechanically tumbled and polished.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of fluorine; transparent colorful material is collectible and occasionally used in ornaments, but it is too soft for most jewelry.

Geological facts

Green fluorite commonly owes its color to trace elements or radiation-related defects, and many specimens show purple, blue, yellow, or banded zoning.

Field identification & locations

Identify by its relatively soft surface, glassy appearance, octahedral cleavage, and cubic or banded zoning; a knife may scratch it, while it can scratch gypsum. Common sources include China, Mexico, the United States, England, and South Africa.