mineral

Polished yellow-orange calcite (likely honey calcite)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, translucent yellow-orange color, and rhombohedral cleavage; this tumbled piece has a smooth polish. The cloudy appearance may reflect inclusions or fine-grained texture.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, limestone, marble, and cave deposits through precipitation from calcium-rich fluids. Calcite occurs from Precambrian to Recent ages, but the specimen’s locality and age cannot be determined from the image.

Uses & applications

Used in cement, lime, aggregate, carbonate fillers, and as a collector or decorative stone; translucent honey calcite is occasionally used in carvings and inexpensive jewelry.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid and shows strong birefringence: clear pieces can visibly double printed lines. Its yellow color commonly results from iron or other trace impurities.

Field identification & locations

Look for rhombohedral cleavage, low hardness, and acid reaction; it should scratch easily with a steel blade or even a copper coin. Common sources include Mexico, the United States, Brazil, and parts of Europe.