mineral

Green fluorite (rough crystal)

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

Typically translucent green with glassy luster and cubic crystal structure; perfect octahedral cleavage, Mohs hardness 4, and specific gravity about 3.18. The irregular specimen appears green-blue with pale zones and surface weathering.

Identified September 3, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and carbonate-hosted deposits, commonly with quartz, calcite, and barite; its age varies with the host deposit, often Paleozoic to Cenozoic. The image alone cannot establish a precise locality or age.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of fluorine; transparent, well-formed crystals are collectible and occasionally cut as gemstones, though they are relatively soft.

Geological facts

Fluorite commonly fluoresces blue, purple, green, or yellow under ultraviolet light, and its name derives from its use as a metallurgical flux. Color can result from trace elements, radiation, or crystal defects.

Field identification & locations

Identify by testing for cubic cleavage, relatively low hardness, and possible UV fluorescence; a knife or steel edge may scratch it, but avoid damaging collectible surfaces. Common sources include China, Mexico, England, the United States, Morocco, and Namibia.