mineral

Blue-green calcite

Calcite (CaCO₃), likely copper-bearing or otherwise inclusions-colored

AI-generated identification · may be incorrect

Pale aqua-green, translucent to opaque, vitreous-to-pearly luster, irregular cleavage surfaces, and commonly rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.71. The rough, pale appearance is consistent with calcite, though image-only identification is not definitive.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-carbonate-rich groundwater precipitates in cavities, veins, or sedimentary rocks; blue-green color may result from copper minerals or other trace impurities. Calcite occurs from recent deposits to rocks of virtually any geological age.

Uses & applications

Used for cement, lime, aggregate, and chemical applications; attractive transparent or strongly colored pieces are sold as decorative or collection specimens rather than jewelry because of low hardness.

Geological facts

Calcite effervesces visibly with dilute hydrochloric acid and shows strong birefringence: a clear fragment can make text appear doubled. Color alone cannot reliably distinguish it from fluorite, aragonite, or copper-bearing minerals.

Field identification & locations

Common worldwide, including Mexico, the United States, Peru, and China. Confirm with a hardness test and acid reaction; avoid scratching valuable specimens and use vinegar only as a weak screening test.