mineral

Fluorite (Purple Fluorite Egg)

Fluorite (Calcium Fluoride, CaF2)

AI-generated identification · may be incorrect

Mohs hardness 4; purple to violet with translucent to transparent zones and internal cleavage planes; vitreous luster; isometric crystal system (often cubic/octahedral in natural state); perfect octahedral cleavage in four directions; specific gravity 3.18.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed via hydrothermal activity in veins, cavities, and sedimentary carbonates, often alongside minerals like quartz, calcite, and barite across various geological eras.

Uses & applications

Commonly carved and polished into decorative shapes such as eggs and spheres for collectors and metaphysical use; in industry, fluorite (fluorspar) is critical as a flux in steelmaking and for hydrofluoric acid production.

Geological facts

Fluorite gave its name to the optical phenomenon of 'fluorescence' because many specimens glow intensely under ultraviolet light. Its perfect 4-directional cleavage makes carving spheres and eggs tricky, often resulting in prominent internal reflective fractures.

Field identification & locations

Recognized by its distinct purple hues, perfect octahedral cleavage fractures, and low hardness (easily scratched by a pocket knife or glass, distinguishing it from amethyst). Major sources include China, Mexico, England, and the United States.