mineral

Green Fluorite

Calcium Fluoride (CaF2)

Hardness: 4 on the Mohs scale; Color: Mint to deep emerald green; Luster: Vitreous (glass-like); Crystal Structure: Isometric/Cubic with perfect octahedral cleavage; Specific Gravity: 3.175–3.56.

Hardness: 4 on the Mohs scale
Color: Mint to deep emerald green
Luster: Vitreous (glass-like)

Identified February 21, 2026More mineral →

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Physical properties

Hardness: 4 on the Mohs scale; Color: Mint to deep emerald green; Luster: Vitreous (glass-like); Crystal Structure: Isometric/Cubic with perfect octahedral cleavage; Specific Gravity: 3.175–3.56.

Formation & geological history

Formed through hydrothermal activity where hot, mineral-rich fluids circulate through crustal rocks, often in veins associated with metallic ores. It can be found in sedimentary rocks like limestone or as a late-stage mineral in granitic rocks.

Uses & applications

Used as a flux in steel manufacturing (smelting), in the production of hydrofluoric acid, high-performance telescope and camera lenses, and widely in jewelry and lapidary arts as decorative carvings.

Geological facts

Fluorite is the most colorful mineral in the world, often called 'the most colorful mineral in the world.' The term 'fluorescence' was derived from fluorite because many specimens glow under ultraviolet light due to impurities in the crystal lattice.

Field identification & locations

Identified in the field by its cubic crystal habit, 4-way cleavage, and its ability to be scratched by a steel knife but not a copper penny. Found globally, with major deposits in China, Mexico, South Africa, and the Illinois-Kentucky Fluorspar District in the USA.