mineral
Green fluorite (rough crystal fragment)
Fluorite, CaF₂
AI-generated identification · may be incorrectPale green, translucent with a vitreous luster; Mohs hardness 4, cubic crystal system, and perfect octahedral cleavage. The small, rounded triangular piece is consistent with a cleavage fragment, though the photo alone cannot confirm the identification.
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Physical properties
Pale green, translucent with a vitreous luster; Mohs hardness 4, cubic crystal system, and perfect octahedral cleavage. The small, rounded triangular piece is consistent with a cleavage fragment, though the photo alone cannot confirm the identification.
Formation & geological history
Forms when fluoride-rich hydrothermal fluids fill fractures and cavities, commonly in veins with quartz, calcite, or metallic ores. Fluorite occurs in rocks of many ages, so the specimen’s age cannot be determined from the image.
Uses & applications
Used as a flux in steelmaking and as a source of fluorine; clear, colorful pieces are cut for jewelry and collected as mineral specimens.
Geological facts
Fluorite fluoresces under ultraviolet light in some specimens; its name gave rise to the term fluorescence.
Field identification & locations
Look for glassy luster, cubic crystals or octahedral cleavage, and hardness low enough to be scratched by a steel knife. Common sources include China, Mexico, South Africa, and Illinois, USA.
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