
mineral
Blue calcite, possibly with lazurite/sodalite
Calcite (CaCO₃); blue coloration may reflect inclusions or admixture of sodalite/lazurite
AI-generated identification · may be incorrectPale to deep blue, translucent to opaque pieces with vitreous-to-pearly luster; calcite has Mohs hardness 3, rhombohedral crystal structure, and perfect rhombohedral cleavage. The image is insufficient to confirm composition or distinguish it from blue fluorite or sodalite.
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Physical properties
Pale to deep blue, translucent to opaque pieces with vitreous-to-pearly luster; calcite has Mohs hardness 3, rhombohedral crystal structure, and perfect rhombohedral cleavage. The image is insufficient to confirm composition or distinguish it from blue fluorite or sodalite.
Formation & geological history
Likely hydrothermal or metamorphic mineralization in carbonate-rich rocks; such specimens commonly form in cavities and veins, generally from Phanerozoic geological settings.
Uses & applications
Collected as an ornamental mineral and used decoratively; calcite is also important industrially in cement, lime, aggregate, and fillers. Value depends strongly on confirmed identity, color, translucency, and crystallization.
Geological facts
Calcite effervesces vigorously with dilute hydrochloric acid, unlike sodalite and fluorite. Blue calcite is relatively soft and scratches easily.
Field identification & locations
Common sources include Mexico, Madagascar, Brazil, and the United States. Test cautiously with hardness and acid; avoid damaging a display specimen.
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