mineral

Green Fluorite

Calcium Fluoride (CaF2)

Hardness: 4 on Mohs scale; Color: Intense emerald green to mint green; Luster: Vitreous (glassy); Crystal structure: Isometric (cubic); Cleavage: Perfect octahedral in four directions; Specific gravity: 3.175 to 3.56.

Hardness: 4 on Mohs scale
Color: Intense emerald green to mint green
Luster: Vitreous (glassy)

Identified March 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily through hydrothermal activity, where hot, mineral-rich fluids circulate through crustal rocks. It often occurs as a gangue mineral in metallic veins alongside lead and silver ores. It can be found in rocks from the Paleozoic era to more recent geological times.

Uses & applications

Used industrially as a flux in steelmaking (fluorospar), in the manufacture of opalescent glass, and to produce hydrofluoric acid. In mineral collecting, it is highly prized for its color and crystal forms. It is also used for decorative carvings and occasionally jewelry (though it is soft).

Geological facts

Fluorite is the mineral from which the term 'fluorescence' was derived, as many specimens glow under ultraviolet light. It is often called 'the most colorful mineral in the world' due to the huge range of hues it can exhibit.

Field identification & locations

Identify in the field by its distinct cubic cleavage, vitreous luster, and low hardness (it can be scratched by a steel knife but not a copper penny). Common locations include China, Mexico, South Africa, and the Illinois-Kentucky Fluorspar District in the USA.