mineral
Calcite crystal
Calcite, CaCO₃
AI-generated identification · may be incorrectPale cream, translucent, vitreous-to-pearly luster with visible cleavage surfaces; Mohs hardness 3 and trigonal crystal structure. The image is consistent with calcite, though a photo cannot confirm the identification.
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Physical properties
Pale cream, translucent, vitreous-to-pearly luster with visible cleavage surfaces; Mohs hardness 3 and trigonal crystal structure. The image is consistent with calcite, though a photo cannot confirm the identification.
Formation & geological history
Forms in limestone and marble, hydrothermal veins, and caves through precipitation or recrystallization of calcium carbonate; deposits range from ancient to geologically recent.
Uses & applications
Used in cement and lime production, construction stone, soil treatment, and as a collectible mineral; transparent varieties may be cut for display but are too soft for most jewelry.
Geological facts
Calcite effervesces in dilute acid and shows strong double refraction in clear crystals. It is a major component of limestone and marble.
Field identification & locations
Look for softness, rhombohedral cleavage, and vigorous fizz with dilute acid; common worldwide in carbonate rocks and veins. Handle gently because it scratches easily.
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