mineral

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Hardness: 4 (Mohs scale), Color: Green (in this specimen), Luster: Vitreous, Crystal Structure: Cubic, Cleavage: Perfect octahedral, Specific Gravity: 3.175–3.184

Identified April 9, 2026More mineral →

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Physical properties

Hardness: 4 (Mohs scale), Color: Green (in this specimen), Luster: Vitreous, Crystal Structure: Cubic, Cleavage: Perfect octahedral, Specific Gravity: 3.175–3.184

Formation & geological history

Formed predominantly in hydrothermal veins alongside metallic minerals such as lead and silver ores. It can also be found in vugs in limestones and occasionally in igneous rocks like pegmatites.

Uses & applications

Used as a flux in steel making, in the manufacture of hydrofluoric acid, in high-performance telescopes and camera lenses, and as a popular semi-precious gemstone and collector mineral.

Geological facts

The term 'fluorescence' is derived from fluorite, as many specimens glow under ultraviolet light. It is often called the most colorful mineral in the world due to the wide variety of hues it can exhibit.

Field identification & locations

Identified in the field by its distinct 4-directional cleavage and habit of forming cubic crystals. Green fluorite is commonly found in locations like the Rogerley Mine in England and various sites in China and Mexico.