mineral

Tumbled purple fluorite (probable)

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

Purple-blue, translucent to opaque specimen with a glassy luster and visible cleavage surfaces; fluorite is cubic, has perfect octahedral cleavage, Mohs hardness 4, and specific gravity about 3.18. The rounded shape suggests tumbling or abrasion, though the image alone cannot exclude purple glass or another mineral.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and cavities associated with limestone and igneous rocks, commonly alongside quartz, calcite, and galena. Deposits range from Paleozoic to recent geological ages.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of fluorine; attractive purple material is sold as inexpensive ornamental or collecting stone.

Geological facts

Purple color commonly results from color centers related to radiation or impurities. Fluorite’s cleavage can produce smooth triangular or octahedral-looking breaks.

Field identification & locations

Look for cubic zoning, strong octahedral cleavage, and a cool, relatively heavy feel; it should not scratch glass but can be scratched by a steel knife. Common sources include China, Mexico, the United States, and England.