mineral

Orange calcite (rough fragment)

Calcite, CaCO₃

AI-generated identification · may be incorrect

Likely translucent orange calcite with a vitreous to pearly luster and prominent cleavage; Mohs hardness 3, trigonal crystal system, specific gravity about 2.7. The image alone cannot confirm the mineral; calcite fizzes in dilute acid and is easily scratched with a steel knife.

Identified October 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-carbonate-rich fluids precipitate in veins, cavities, or sedimentary settings; orange color commonly comes from iron impurities. Calcite occurs in rocks of many ages.

Uses & applications

Used in cement and lime production, soil treatment, and as a decorative or collectible mineral; attractive pieces may be polished for ornaments.

Geological facts

Calcite cleaves into rhombohedral pieces rather than breaking with the conchoidal fracture typical of quartz.

Field identification & locations

Check for easy scratching and a vigorous fizz with dilute hydrochloric acid; orange calcite is common in Mexico, the United States, and elsewhere. The specimen appears to be a small, rough cleavage fragment.