mineral

Green Fluorite

Calcium fluoride (CaF2)

Hardness: 4 on Mohs scale; Color: Pale green to translucent; Luster: Vitreous (glassy); Crystal Structure: Isometric; Cleavage: Perfect octahedral; Specific Gravity: 3.18

Hardness: 4 on Mohs scale
Color: Pale green to translucent
Luster: Vitreous (glassy)

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 4 on Mohs scale; Color: Pale green to translucent; Luster: Vitreous (glassy); Crystal Structure: Isometric; Cleavage: Perfect octahedral; Specific Gravity: 3.18

Formation & geological history

Formed primarily in hydrothermal veins and through metasomatic processes where hot, fluorine-rich fluids react with calcium-rich rocks like limestone. It can occur across various geological ages from Precambrian to Cenozoic.

Uses & applications

Used as a flux in steel making, in the manufacture of hydrofluoric acid, as high-precision optical lenses, and as a popular semi-precious gemstone for jewelry and carvings.

Geological facts

Fluorite is often called 'the most colorful mineral in the world.' It gave its name to the phenomenon of fluorescence because many specimens glow blueish-white under ultraviolet light.

Field identification & locations

Identify in the field by its distinct 4-way octahedral cleavage, its ability to be scratched by a steel knife but not a copper penny, and its glassy luster. Common in many environments including Illinois, China, and Morocco.