mineral
Blue calcite (rough fragment)
Calcite, CaCO₃
AI-generated identification · may be incorrectPale blue, translucent to cloudy, with a vitreous-to-pearly luster and prominent rhombohedral cleavage; Mohs hardness 3. The small, roughly cleaved fragment is consistent with calcite, though a photo alone cannot confirm it.
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Physical properties
Pale blue, translucent to cloudy, with a vitreous-to-pearly luster and prominent rhombohedral cleavage; Mohs hardness 3. The small, roughly cleaved fragment is consistent with calcite, though a photo alone cannot confirm it.
Formation & geological history
Forms in sedimentary limestones and veins from mineral-rich fluids; calcite occurs in rocks of many ages, from recent deposits to ancient formations.
Uses & applications
Used for ornamental carvings and mineral collecting; calcite is also a major industrial source of lime and a component of cement and construction stone.
Geological facts
Calcite fizzes in dilute acid and is easily scratched by a copper coin—useful identification clues, though avoid testing a valuable specimen.
Field identification & locations
Common worldwide, including limestone regions and hydrothermal veins. Check for rhombohedral cleavage and low hardness; blue color alone is not diagnostic.
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