mineral
Blue calcite (probable)
Calcite, CaCO₃
AI-generated identification · may be incorrectPale to vivid blue, cloudy and irregular with a vitreous-to-pearly luster; Mohs hardness 3, excellent rhombohedral cleavage, trigonal crystal system, and specific gravity about 2.71. The specimen may contain gray or brown matrix/inclusions.
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Physical properties
Pale to vivid blue, cloudy and irregular with a vitreous-to-pearly luster; Mohs hardness 3, excellent rhombohedral cleavage, trigonal crystal system, and specific gravity about 2.71. The specimen may contain gray or brown matrix/inclusions.
Formation & geological history
Blue calcite forms in hydrothermal veins, cavities, and carbonate-rich sedimentary environments when trace elements or inclusions produce its color. The image alone cannot establish its geological age; deposits occur in many Phanerozoic carbonate sequences.
Uses & applications
Primarily a collector specimen, ornamental stone, and lapidary material; calcite is also industrially important in cement, lime, aggregate, and chemical production. Blue material is generally too soft for durable jewelry.
Geological facts
Calcite effervesces strongly with dilute hydrochloric acid and shows perfect rhombohedral cleavage. Its blue color can overlap with aragonite, fluorite, or dyed carbonate material, so testing is recommended.
Field identification & locations
Common sources include Mexico, Madagascar, Peru, and parts of the United States. Confirm identification with a hardness test, acid reaction, cleavage, and—if necessary—specific-gravity or laboratory analysis.
