mineral

Tumbled orange calcite

Calcite (CaCO₃), likely orange/pink calcite

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, pale orange to salmon color, translucent areas, and prominent rhombohedral cleavage; the polished surface obscures crystal form. Effervesces readily in dilute hydrochloric acid or vinegar (slowly).

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in limestone, marble, hydrothermal veins, and cavities from calcium-carbonate-rich fluids; the specimen is likely a modern tumbled piece rather than an age-diagnostic rock. Calcite deposits range from ancient to Recent in age.

Uses & applications

Used for cement, lime, aggregate, soil treatment, and optical instruments; attractive orange calcite is sold as a decorative or metaphysical carving stone. It is generally too soft for durable jewelry.

Geological facts

Orange coloration commonly comes from iron or other trace impurities. Calcite is one of the most abundant minerals and has three perfect cleavage directions, producing rhombohedral fragments.

Field identification & locations

Identify by its softness, light color, rhombohedral cleavage, and acid reaction; it can be scratched by a copper coin or steel knife. Common sources include Mexico, Brazil, China, and the United States.