mineral

Polished blue calcite

Calcite (CaCO₃), likely blue banded or massive calcite

AI-generated identification · may be incorrect

Usually pale blue to icy blue, translucent, with vitreous to pearly luster and a smooth polished surface; Mohs hardness 3, rhombohedral crystal system, perfect rhombohedral cleavage, and specific gravity about 2.71. It may show white zoning or banding from impurities and fluid inclusions.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins, cavities, and carbonate-rich sedimentary environments when calcium-carbonate fluids precipitate; blue coloration commonly reflects trace impurities or inclusions. Specimen age depends on its host deposit, commonly Paleozoic to Cenozoic.

Uses & applications

Used as an ornamental and lapidary stone, for carvings, polished specimens, and crystal collecting; calcite is also important industrially in cement, lime, aggregate, and chemical production.

Geological facts

Calcite effervesces visibly with dilute hydrochloric acid and strongly exhibits double refraction in clear pieces. Blue calcite is generally a decorative variety rather than a distinct mineral species.

Field identification & locations

Identify by its softness, rhombohedral cleavage, acid reaction, and blue translucency; common sources include Mexico, Madagascar, Brazil, and the United States. Avoid harsh handling because polished calcite scratches easily.