mineral

Green Fluorite

Calcium Fluoride (CaF2)

Hardness 4 on Mohs scale, vitreous to glassy luster, isometric/cubic crystal system, perfect 4-directional octahedral cleavage, pale green to sea-green translucency, specific gravity ~3.18.

Identified July 24, 2026More mineral →

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Physical properties

Hardness 4 on Mohs scale, vitreous to glassy luster, isometric/cubic crystal system, perfect 4-directional octahedral cleavage, pale green to sea-green translucency, specific gravity ~3.18.

Formation & geological history

Hydrothermal mineral formed in veins and fractures of limestone and granite by fluorine-bearing fluids reacting with calcium-rich rocks.

Uses & applications

Used as a flux in steelmaking and smelting, production of hydrofluoric acid, high-grade optical lenses, lapidary carvings, and mineral collecting.

Geological facts

Fluorite glows under ultraviolet light, a phenomenon named 'fluorescence' after this very mineral. It comes in almost every color of the rainbow, but green is one of the most classic varieties.

Field identification & locations

Identified by its softness (can be scratched by glass/steel blade), distinct cleavage planes, cubic crystal habits, and glassy, sub-translucent green appearance. Commonly found in China, Mexico, South Africa, England, and Illinois (USA).