mineral
Green fluorite (tentative identification)
Fluorite, CaF₂
AI-generated identification · may be incorrectSmall, translucent dark-green fragment with a vitreous-to-dull luster; fluorite has Mohs hardness 4, cubic crystals, and perfect octahedral cleavage. The photo lacks diagnostic crystal faces, so identification is uncertain.
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Physical properties
Small, translucent dark-green fragment with a vitreous-to-dull luster; fluorite has Mohs hardness 4, cubic crystals, and perfect octahedral cleavage. The photo lacks diagnostic crystal faces, so identification is uncertain.
Formation & geological history
Fluorite commonly forms from hydrothermal fluids in veins and cavities, often alongside quartz and calcite; deposits span many geological ages.
Uses & applications
Used as a flux in steelmaking and as a source of fluorine; attractive crystals are collected, while gem-quality fluorite is occasionally cut for jewelry.
Geological facts
Fluorite fluoresces under ultraviolet light in some specimens; its name gives rise to the term fluorescence.
Field identification & locations
Look for softness (a knife can scratch it) and distinctive cleavage; green glass or other green minerals can look similar. Common localities include China, Mexico, and Illinois, USA.
