mineral
Blue calcite (likely)
Calcite, CaCO₃
AI-generated identification · may be incorrectPale blue to white, translucent and vitreous to pearly, with prominent rhombohedral cleavage; Mohs hardness 3 and trigonal crystal structure. The photo suggests rough calcite, though identification from appearance alone is not certain.
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Physical properties
Pale blue to white, translucent and vitreous to pearly, with prominent rhombohedral cleavage; Mohs hardness 3 and trigonal crystal structure. The photo suggests rough calcite, though identification from appearance alone is not certain.
Formation & geological history
Forms when calcium-carbonate-rich fluids precipitate in veins and cavities, and in sedimentary deposits; calcite occurs in rocks of many ages.
Uses & applications
Used as a source of lime and cement, as a building stone, and in decorative objects and mineral collections; blue specimens are mainly ornamental.
Geological facts
Calcite effervesces in dilute acid and is readily scratched by a steel knife. Its blue color commonly reflects trace impurities or inclusions.
Field identification & locations
Look for soft, easily cleaved pieces and rhombohedral fragments; common worldwide in limestone regions and hydrothermal veins. A hardness or acid test can help distinguish it from similar pale-blue minerals.
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