mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
Hardness: 4 (Mohs scale), Color: Pale to deep green with translucent transparency, Luster: Vitreous (glass-like), Crystal Structure: Isometric/Cubic, Cleavage: Perfect octahedral in four directions, Specific Gravity: 3.18
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Physical properties
Hardness: 4 (Mohs scale), Color: Pale to deep green with translucent transparency, Luster: Vitreous (glass-like), Crystal Structure: Isometric/Cubic, Cleavage: Perfect octahedral in four directions, Specific Gravity: 3.18
Formation & geological history
Formed through hydrothermal activity in sedimentary or metamorphic rocks, often associated with metallic ore veins. Created when fluorine-rich hydrothermal fluids react with calcium-bearing minerals.
Uses & applications
Used as a flux in steel making, in the manufacture of hydrofluoric acid, high-clarity lenses for telescopes and cameras, and widely collected as ornamental specimens or lapidary material for jewelry.
Geological facts
Fluorite is highly fluorescent under UV light (a property named after the mineral). These specimens show a classic 'sea-foam' green hue often found in mines in the UK, China, and the USA.
Field identification & locations
Identify by its glass-like luster and cubic crystal habit. In the field, look for its softness (can be scratched by a knife but not a penny) and its distinct octahedral cleavage. Common in mineral-rich veins.
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