mineral

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Hardness: 4 (Mohs scale); Color: Pale to deep green with possible purple zoning; 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 with possible purple zoning
Luster: Vitreous (glassy)

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes, typically as a vein mineral in metallic deposits or in sedimentary environments like limestone. It can be found in a wide variety of geological ages ranging from the Paleozoic to the Cenozoic.

Uses & applications

Used as a flux in steel making, in the production of hydrofluoric acid, and high-quality telescope lenses. Commonly used as a semi-precious gemstone for decorative carvings and jewelry (though soft for rings).

Geological facts

Fluorite is the origin of the term 'fluorescence,' as many specimens glow under UV light. It is often called 'the most colorful mineral in the world' due to its wide range of hues caused by impurities.

Field identification & locations

Identify in the field by its cubic crystal habit, its 4-point cleavage, and its softness (can be scratched by a steel knife but not a copper coin). Found globally with notable deposits in Illinois (USA), China, and Mexico.