Fluorite

Physical Properties

Hardness: 4 (Mohs scale); Color: Typically purple, green, or blue, can be multicolored; Luster: Vitreous; Crystal Structure: Isometric (cubic/octahedral); Cleavage: Perfect octahedral; Specific gravity: 3.175–3.184.

Formation & Geological History

Fluorite forms as a hydrothermal mineral in veins, typically appearing in igneous or sedimentary environments as hot fluorine-bearing fluids pass through limestone or other rocks.

Uses & Applications

Used as a flux in steel making, as a source for fluorine in chemical manufacturing, in high-performance telescope lenses, and as a popular ornamental stone for jewelry and metaphysical collections.

Geological Facts

Fluorite gave its name to the phenomenon of fluorescence because many specimens glow under UV light. It is often referred to as 'the most colorful mineral in the world.'

Field Identification & Locations

Identify by its characteristic 4 directions of perfect cleavage and its relatively low hardness (can be scratched by a pocket knife). Often found in hydrothermal vein deposits alongside minerals like galena and calcite.

Identified on: 4/14/2026

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