mineral

Fluorite

Calcium Fluoride (CaF2)

Hardness: 4 on Mohs scale. Color: Green, purple, and clear banding. Luster: Vitreous (glassy). Crystal structure: Isometric (cubic). Cleavage: Perfect octahedral. Specific gravity: 3.18.

Hardness: 4 on Mohs scale
Color: Green, purple, and clear banding
Luster: Vitreous (glassy)

Identified July 3, 2026More mineral →

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Physical properties

Hardness: 4 on Mohs scale. Color: Green, purple, and clear banding. Luster: Vitreous (glassy). Crystal structure: Isometric (cubic). Cleavage: Perfect octahedral. Specific gravity: 3.18.

Formation & geological history

Formed through hydrothermal activity, often in veins or as a gangue mineral in metallic ore deposits. It occurs in a wide variety of geological environments ranging from sedimentary rocks to igneous intrusions.

Uses & applications

Used primarily in the manufacture of hydrofluoric acid, as a flux in steel making ('fluorspar'), in the production of high-performance telescopes/lenses, and widely for jewelry, carvings, and metaphysical collecting.

Geological facts

Fluorite is the origin of the term 'fluorescence,' as many specimens glow under ultraviolet light. It is often called 'The Most Colorful Mineral in the World' due to its wide range of hues.

Field identification & locations

Identify by its hardness (can be scratched by a knife but not a copper penny) and its distinct cubic crystal shapes or octahedral cleavage. Commonly found in China, Mexico, South Africa, and the USA (Illinois/Kentucky).