mineral
Rainbow fluorite crystal point
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectPolished, elongated crystal with purple, blue, and green color zoning. Mohs hardness 4; vitreous luster; cubic crystal system and perfect octahedral cleavage. The cut shape obscures natural crystal faces.
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Physical properties
Polished, elongated crystal with purple, blue, and green color zoning. Mohs hardness 4; vitreous luster; cubic crystal system and perfect octahedral cleavage. The cut shape obscures natural crystal faces.
Formation & geological history
Fluorite forms when mineral-rich hydrothermal fluids deposit calcium fluoride in veins and cavities, commonly alongside other ore minerals. The specimen’s exact locality and age cannot be determined from the image.
Uses & applications
Used as a decorative crystal and collector specimen; fluorite is also an industrial source of fluorine and a flux in steelmaking, while clear varieties are used in specialized optics.
Geological facts
Fluorite’s vivid bands arise from trace impurities and changes in fluid chemistry during growth; it commonly fluoresces under ultraviolet light.
Field identification & locations
Color zoning and relatively low hardness are typical clues, but glass imitations exist. Major deposits occur in China, Mexico, South Africa, and Illinois, USA; avoid scratching it because it is softer than a steel knife.
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