mineral

Green Fluorite

Calcium Fluoride (CaF2)

Hardness: 4 on Mohs scale. Color: Transparent to translucent pale-to-emerald green. Luster: Vitreous (glassy). Crystal structure: Cubic or octahedral. Cleavage: Perfect octahedral in four directions. Specific gravity: 3.175–3.56.

Hardness: 4 on Mohs scale
Color: Transparent to translucent pale-to-emerald green
Luster: Vitreous (glassy)

Identified March 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal activity where hot fluoride-bearing fluids circulate through cracks in host rocks like limestone. It is commonly found in veins or as a gangue mineral in metallic ore deposits.

Uses & applications

Used as a flux in steel making, in the manufacture of hydrofluoric acid, and high-quality optical lenses. Frequently used in jewelry as cabochons or beads, and highly sought after by mineral collectors for its vibrant colors.

Geological facts

Fluorite is the origin of the word 'fluorescence' because many specimens glow under UV light. It is often called 'the most colorful mineral in the world' due to the wide variety of possible hues caused by impurities.

Field identification & locations

Identify in the field by its 4-way perfect cleavage and low hardness (can be scratched by a steel knife but not a penny). Commonly found in China, Mexico, South Africa, and the 'Fluorspar District' of Illinois/Kentucky. Collectors should look for sharp cubic crystal faces.