mineral

Tumbled orange calcite (probable)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

A polished, translucent peach-orange pebble with a glassy-to-waxy luster; calcite has Mohs hardness 3, perfect rhombohedral cleavage, and specific gravity about 2.71. The pale color may come from iron or other impurities; exact identification requires a hardness or acid test.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as a carbonate vein or sedimentary deposit, then cut and tumbled by humans; calcite occurs from Precambrian to recent geological settings. Its rounded shape is manufactured rather than naturally weathered.

Uses & applications

Used as a decorative and collecting stone, ornamental carving material, and occasionally in jewelry; industrial calcite is important for cement, lime, glass, and chemical production. This small tumbled piece has modest commercial value.

Geological facts

Calcite effervesces visibly with dilute hydrochloric acid or household vinegar if freshly scratched, though polished surfaces may react weakly. It can be confused with orange aragonite, quartz, or dyed chalcedony.

Field identification & locations

Common sources include Mexico, the United States, Iceland, and China; test an inconspicuous spot for softness and acid reaction. A steel knife should scratch it, while it should not scratch glass.