mineral
Likely blue calcite
Calcite (CaCO₃)
AI-generated identification · may be incorrectPale blue-gray, translucent with a vitreous to pearly luster and prominent cleavage planes. Mohs hardness 3; trigonal crystal structure. Identification is tentative from the image alone.
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Physical properties
Pale blue-gray, translucent with a vitreous to pearly luster and prominent cleavage planes. Mohs hardness 3; trigonal crystal structure. Identification is tentative from the image alone.
Formation & geological history
Calcite commonly forms when mineral-rich water precipitates calcium carbonate in veins, cavities, and sedimentary environments. It occurs in rocks of many ages.
Uses & applications
Used as a decorative and collector mineral; calcite also has major industrial uses in cement, lime, and agricultural products.
Geological facts
Calcite effervesces in dilute acid and is strongly birefringent in transparent pieces.
Field identification & locations
Look for its relatively soft surface, rhombohedral cleavage, and reaction to dilute acid. Blue calcite is reported from several localities, including Mexico and Madagascar.
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