mineral

Banded fluorite tower

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Typically purple, lilac, white, and sometimes yellow-green bands; vitreous luster and cubic crystal structure with perfect octahedral cleavage. Mohs hardness 4; specific gravity about 3.18, though polishing and lighting can alter its appearance.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and cavities associated with limestone, dolostone, and igneous rocks when fluorine-rich fluids precipitate calcium fluoride. The specimen’s exact geological age and locality cannot be determined from the image.

Uses & applications

Used industrially as a flux in steelmaking and aluminum production, and as a source of hydrofluoric acid; attractive banded material is cut into towers, spheres, carvings, and decorative objects. Fine transparent crystals are collectible, while fluorite is occasionally used as a gemstone.

Geological facts

The pronounced horizontal color zoning is characteristic of fluorite growth in changing chemical conditions. It may fluoresce blue, purple, or green under ultraviolet light, depending on trace impurities.

Field identification & locations

Identify by its vivid zoning, glassy polish, relatively low hardness, and octahedral cleavage; it can be scratched by a steel knife. Common sources include China, Mexico, England, the United States, and Morocco.