mineral

Green Fluorite

Calcium Fluoride (CaF2)

Hardness: 4 (Mohs scale), Color: Pale to deep green, Luster: Vitreous (glassy), Crystal structure: Isometric (cubic), Cleavage: Perfect octahedral, Specific gravity: 3.18

Identified June 25, 2026More mineral →

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Physical properties

Hardness: 4 (Mohs scale), Color: Pale to deep green, Luster: Vitreous (glassy), Crystal structure: Isometric (cubic), Cleavage: Perfect octahedral, Specific gravity: 3.18

Formation & geological history

Forms primarily as a hydrothermal mineral in veins, often associated with metallic ores like lead and zinc. It can also occur in sedimentary rocks as a byproduct of hydrothermal activity.

Uses & applications

Used in metallurgy as a flux to lower smelting temperatures, in the production of hydrofluoric acid, as high-fidelity telescope lenses, and as a popular semi-precious gemstone for jewelry and collecting.

Geological facts

Fluorite is the source of the term 'fluorescence' because many specimens glow under ultraviolet light. It is often called 'the most colorful mineral in the world'.

Field identification & locations

Identified in the field by its distinct green color, vitreous luster, and 4-way perfect cleavage. It can be scratched by a steel knife but not by a copper penny. Found globally in places like China, Mexico, South Africa, and Illinois, USA.