mineral

Green fluorite (rough crystal fragment)

Fluorite, CaF₂

AI-generated identification · may be incorrect

Pale green, translucent to transparent, with a glassy luster and cubic crystal structure; Mohs hardness 4, perfect octahedral cleavage, specific gravity about 3.18. The image shows a small, worn-looking fragment; identification from appearance alone is not definitive.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when fluoride-rich fluids crystallize in hydrothermal veins and cavities, often alongside quartz, calcite, or sulfide minerals. Such deposits span many geological ages.

Uses & applications

Used as a flux in steelmaking and as a source of fluorine; clear, colorful crystals are collected and occasionally cut for jewelry, though softness limits wearability.

Geological facts

Fluorite fluoresces under some ultraviolet light, a phenomenon named after the mineral.

Field identification & locations

Check for cubic forms, cleavage, and hardness: fluorite is easily scratched by a steel knife, unlike quartz. Common sources include China, Mexico, South Africa, and the United States; this small, pale fragment is roughly $1–$10 as a specimen.