mineral
Calcite crystal
Calcite (CaCO₃)
AI-generated identification · may be incorrectTranslucent cream to honey-colored crystal with vitreous-to-pearly luster and prominent cleavage; Mohs hardness 3, trigonal crystal system, specific gravity about 2.7. The rough, irregular shape makes exact identification uncertain from the image alone.
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Physical properties
Translucent cream to honey-colored crystal with vitreous-to-pearly luster and prominent cleavage; Mohs hardness 3, trigonal crystal system, specific gravity about 2.7. The rough, irregular shape makes exact identification uncertain from the image alone.
Formation & geological history
Forms when calcium carbonate precipitates from groundwater or hydrothermal fluids, and in sedimentary and metamorphic settings; calcite occurs in rocks of many ages.
Uses & applications
Used in cement and lime production, agriculture, and as a mineral specimen; clear, attractive crystals are collected or occasionally used ornamentally.
Geological facts
Calcite effervesces readily in dilute hydrochloric acid and has perfect rhombohedral cleavage; its double refraction is especially visible in clear pieces.
Field identification & locations
Look for low hardness, rhombohedral cleavage, and acid reaction; common worldwide in limestone, caves, veins, and hydrothermal deposits. This specimen’s color and habit are consistent with calcite, though image-only identification is provisional.
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