mineral
Banded fluorite point
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectTypically purple, green, blue, or color-banded, with vitreous luster and cubic crystal structure; hardness Mohs 4, perfect octahedral cleavage, and specific gravity about 3.18. The pictured specimen appears polished or shaped into a slender point.
- Color
- banded, with vitreous luster and cubic crystal structure
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Physical properties
Typically purple, green, blue, or color-banded, with vitreous luster and cubic crystal structure; hardness Mohs 4, perfect octahedral cleavage, and specific gravity about 3.18. The pictured specimen appears polished or shaped into a slender point.
Formation & geological history
Forms mainly in hydrothermal veins and replacement deposits, commonly with quartz, calcite, barite, and metallic sulfides. Fluorite deposits range from Paleozoic to modern geological ages, depending on locality.
Uses & applications
Used industrially as a source of fluorine and flux in steelmaking and aluminum processing; attractive transparent material is used for carvings, cabochons, and mineral collections.
Geological facts
Color zoning reflects changing trace-element chemistry during crystal growth; purple coloration commonly involves radiation-related color centers. Fluorite fluoresces strongly under many ultraviolet wavelengths.
Field identification & locations
Identify it by its strong color zoning, glassy appearance, softness, and octahedral cleavage; a glass scratch test should be avoided because polished surfaces can be damaged. Common sources include China, Mexico, England, Namibia, and the United States.
