mineral

Blue calcite (probable)

Calcite, CaCO₃

AI-generated identification · may be incorrect

Pale blue-white, translucent to opaque, with a vitreous to pearly luster and prominent cleavage; Mohs hardness 3. The small rough specimen’s exact identity cannot be confirmed from the image alone.

Identified October 15, 2026More mineral →

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Physical properties

Pale blue-white, translucent to opaque, with a vitreous to pearly luster and prominent cleavage; Mohs hardness 3. The small rough specimen’s exact identity cannot be confirmed from the image alone.

Formation & geological history

Calcite forms in many settings, including limestone and hydrothermal veins, through precipitation or recrystallization. It occurs from the Precambrian to the present.

Uses & applications

Used in cement and lime production, as a decorative stone, and in mineral collections; blue calcite is sometimes cut or polished for ornaments.

Geological facts

Calcite effervesces in dilute hydrochloric acid and has strong rhombohedral cleavage; blue color commonly results from trace impurities or structural defects.

Field identification & locations

Look for softness, cleavage into rhombohedrons, and acid reaction; common localities include Mexico, Madagascar, and parts of the United States. Similar pale-blue minerals can look alike, so testing is needed for certainty.