mineral

Blue-green calcite

Calcite (CaCO₃), likely a pale aqua variety

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, white to blue-green color, rhombohedral cleavage, and trigonal crystal structure; commonly effervesces strongly in dilute hydrochloric acid. The rough, translucent appearance and cleavage are consistent with calcite, though color may reflect inclusions or surface tr…

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms in limestone, hydrothermal veins, caves, and evaporite environments through precipitation from carbonate-rich fluids. Calcite occurs from Precambrian to Recent deposits; the specimen’s exact age cannot be determined visually.

Uses & applications

Used in cement, lime, aggregate, soil treatment, optical calcite, and as a collector mineral; attractive translucent blue-green pieces may be cut or polished for decorative objects.

Geological facts

Calcite is one of the most common minerals and has highly variable colors caused by impurities. Its rhombohedral cleavage can produce deceptively cube-like fragments, and clear calcite can show strong double refraction.

Field identification & locations

Common worldwide, including Mexico, Brazil, the United States, Iceland, and China. Confirm with a copper-coin scratch test, acid fizz, and cleavage; distinguish from fluorite, which is harder (Mohs 4) and has cubic cleavage.