mineral

Tumbled honey calcite

Calcite (CaCO₃)

AI-generated identification · may be incorrect

Typically amber-yellow, translucent to transparent, with vitreous to waxy luster and rhombohedral cleavage; Mohs hardness 3 and specific gravity about 2.71. The rounded form is mechanically polished, and internal fractures are visible.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Calcite precipitates from carbonate-rich groundwater, hydrothermal fluids, caves, and sedimentary environments; amber varieties commonly form in limestone or marble. The specimen’s exact geological age and locality cannot be determined from the image.

Uses & applications

Used as a decorative and lapidary stone, educational specimen, and occasionally in jewelry; calcite is also important industrially in cement, lime, aggregate, and soil treatment.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid and shows strong birefringence under polarized light. Yellow color may result from iron or other trace impurities.

Field identification & locations

Identify by its low hardness, rhombohedral cleavage, acid reaction, and ability to scratch with a steel knife while not scratching glass. Common sources include Mexico, Brazil, the United States, and China.