mineral

Green fluorite (rough crystal aggregate)

Fluorite, CaF₂

AI-generated identification · may be incorrect

Translucent to transparent green with a vitreous luster and cubic crystal habit; Mohs hardness 4, perfect octahedral cleavage, and specific gravity about 3.2. The specimen appears fractured and matrix-bearing; color alone is not definitive identification.

Identified October 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when fluorine-rich hydrothermal fluids deposit calcium fluoride in veins and cavities, often with quartz, calcite, or sulfide minerals. Fluorite occurs in rocks of many ages, so the specimen’s age cannot be determined from the image.

Uses & applications

Used as a flux in steelmaking and as a source of fluorine for chemicals; attractive crystals are collected and occasionally cut for jewelry, though its softness limits wear.

Geological facts

Fluorite commonly fluoresces under ultraviolet light, a property that inspired the term “fluorescence.”

Field identification & locations

Check for cubic faces, hardness near 4, and distinctive cleavage into smooth octahedral surfaces; avoid scratching or striking the specimen. Major sources include China, Mexico, South Africa, and the United States.