mineral

Pale green rough mineral, likely fluorite

Fluorite (calcium fluoride, CaF₂), identification tentative from image

AI-generated identification · may be incorrect

Light mint-green, translucent to opaque, with a vitreous-to-waxy luster and blocky cleavage surfaces; fluorite has Mohs hardness 4, cubic crystal structure, perfect octahedral cleavage, and specific gravity about 3.18.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and cavities associated with limestone, granite, and other rocks; green coloration commonly results from trace impurities or radiation effects. Geological age depends on locality, commonly Paleozoic to Cenozoic.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of fluorine; transparent, well-formed crystals are collected or cut as gemstones, though this rough piece appears modest in value.

Geological facts

Fluorite is easily scratched by a steel knife and can show distinctive cubic or octahedral cleavage. Similar pale-green specimens may instead be calcite, prehnite, or quartz, requiring hardness, cleavage, and acid tests for confirmation.

Field identification & locations

Common localities include China, Mexico, Illinois and Kentucky, the United Kingdom, and Spain. Test cautiously: fluorite scratches with a steel blade but not a fingernail, while calcite effervesces in dilute acid.