mineral

Green Fluorite

Calcium fluoride (CaF2)

Hardness: 4 on Mohs scale; Color: typically green/purple/clear; Luster: vitreous; Crystal system: isometric/cubic; Cleavage: octahedral; Specific Gravity: 3.1-3.3

Hardness: 4 on Mohs scale
Color: typically green/purple/clear
Luster: vitreous

Identified July 4, 2026More mineral →

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Physical properties

Hardness: 4 on Mohs scale; Color: typically green/purple/clear; Luster: vitreous; Crystal system: isometric/cubic; Cleavage: octahedral; Specific Gravity: 3.1-3.3

Formation & geological history

Formed via hydrothermal activity in veins where cooling fluids pass through rocks, often associated with lead and zinc ores; frequently found in sedimentary limestones.

Uses & applications

Used as a flux in steel making, in the manufacture of hydrofluoric acid, in high-performance telescope lenses, and as a popular semi-precious gemstone due to its color variety.

Geological facts

Fluorite is famous for its wide range of colors and is the source of the term 'fluorescence' because many specimens glow under ultraviolet light. It is also known as 'Fluorspar'.

Field identification & locations

Identified by its distinctive 4-directional octahedral cleavage, cubic crystal habit, and its softness (can be scratched by a knife but not a copper penny). Common in Illinois, China, and Mexico.