mineral

Green Fluorite

Calcium Fluoride (CaF2)

Hardness: 4 (Mohs scale), Color: light green to mint green, Luster: vitreous (glassy), Crystal structure: Isometric (often cubic or octahedral), Cleavage: Perfect octahedral, Transparency: Transparent to translucent.

Identified July 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins as the temperature of the fluid decreases. It often occurs in association with metallic ores like lead and silver. It is commonly found in sedimentary limestone or as an accessory mineral in igneous rocks like granite.

Uses & applications

Used as a flux in steel making, in the manufacture of hydrofluoric acid, in high-performance telescopes/lenses, and as a popular ornamental and semi-precious gemstone for jewelry and lapidary work.

Geological facts

Fluorite is famous for being the source of the term 'fluorescence,' as many specimens glow under UV light. It is often called 'the most colorful mineral in the world' because it can occur in nearly every color of the spectrum.

Field identification & locations

Identified in the field by its distinct four-directional cleavage and soft hardness (it can be scratched by a steel knife but not a copper penny). Collectors look for well-formed cubic crystals and zoned color banding. Found globally with significant deposits in China, Mexico, and the USA (Illinois/Kentucky).