mineral

Orange calcite

Calcite (CaCO₃), likely honey/orange calcite

AI-generated identification · may be incorrect

Usually Mohs hardness 3, vitreous to pearly luster, orange-yellow color, translucent to transparent, and excellent rhombohedral cleavage; crystals are trigonal. The specimen appears rough and cleaved, though exact identification by image alone is provisional.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-carbonate-rich groundwater precipitates in cavities, veins, limestone, and hydrothermal environments; orange color commonly comes from iron or other trace impurities. Calcite occurs from recent deposits through rocks of all geological ages.

Uses & applications

Used industrially for cement, lime, aggregate, soil treatment, and chemical applications; attractive transparent pieces are sold as display minerals, though calcite is too soft for most jewelry.

Geological facts

Calcite strongly effervesces with dilute hydrochloric acid and shows double refraction in clear pieces. Its rhombohedral cleavage distinguishes it from similarly colored quartz, which is much harder and lacks cleavage.

Field identification & locations

Common in limestone, marble, caves, hydrothermal veins, and volcanic cavities worldwide, including Mexico, Brazil, China, and the United States. Test cautiously with a steel knife (it scratches calcite) and acid; avoid acids if preservation matters.