mineral

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Hardness: 4 (Mohs scale); Color: Pale to deep green; Luster: Vitreous (glassy); Crystal Structure: Isometric (often cubic or octahedral); Cleavage: Perfect octahedral in four directions; Specific Gravity: 3.18

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

Identified April 2, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal activity, occurring as a vein mineral in metallic deposits. It can also form in sedimentary rocks like limestone via hydrothermal replacement. It is found in diverse geological environments ranging from the Paleozoic to the Cenozoic era.

Uses & applications

Used as a flux in steel making, in the production of hydrofluoric acid for aluminum smelting, as a source of fluorine for water fluoridation, in high-performance telescope and camera lenses, and as a popular semi-precious gemstone for jewelry and collecting.

Geological facts

Fluorite was the first mineral to exhibit 'fluorescence,' a phenomenon named after the mineral itself. It is often called 'the most colorful mineral in the world.' It glows under ultraviolet light and can sometimes display thermoluminescence (glowing when heated).

Field identification & locations

Identify in the field by its distinct 4-directional cleavage (creating octahedral shapes), Its relatively low hardness (easily scratched by a knife but not a penny), and its glassy luster. It is common in mining districts in China, Mexico, England, and the United States (notably Illinois).