mineral
Blue calcite (likely)
Calcite, CaCO₃
AI-generated identification · may be incorrectPale blue to white, translucent, with a vitreous-to-pearly luster and prominent cleavage; Mohs hardness 3. The blocky shape and cleavage surfaces are consistent with calcite, though the photo alone cannot confirm the identification.
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Physical properties
Pale blue to white, translucent, with a vitreous-to-pearly luster and prominent cleavage; Mohs hardness 3. The blocky shape and cleavage surfaces are consistent with calcite, though the photo alone cannot confirm the identification.
Formation & geological history
Calcite forms in many settings, including limestone and marble, veins, and cavities in sedimentary or hydrothermal environments; specimens may be geologically very old.
Uses & applications
Used as a decorative and collectible mineral; calcite is also an important industrial source of lime and a component of cement and construction stone.
Geological facts
Calcite effervesces in dilute acid and is strongly birefringent, doubling images viewed through clear crystals.
Field identification & locations
Look for softness, rhombohedral cleavage, and fizzing with dilute acid; common worldwide. The image shows several rough, pale-blue pieces, but other minerals may resemble them.
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