mineral

Tumbled yellow calcite

Calcite (CaCO₃), likely honey/yellow calcite

AI-generated identification · may be incorrect

Pale yellow, translucent to semi-translucent, with a vitreous-to-pearly luster and cloudy internal zoning; Mohs hardness 3, rhombohedral crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-carbonate-rich groundwater precipitates in cavities, veins, caves, or sedimentary settings; yellow coloration commonly comes from iron or other trace impurities. The specimen has been naturally or artificially rounded and polished.

Uses & applications

Used industrially in cement, lime, construction aggregate, soil treatment, and chemical manufacture; attractive polished pieces are sold as inexpensive decorative or metaphysical specimens rather than jewelry stones.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar, although polished surfaces may react slowly. Its cleavage and low hardness distinguish it from harder yellow quartz or jasper.

Field identification & locations

Common localities include Mexico, the United States, Peru, Iceland, and China. Identify it by its softness, rhombohedral cleavage, cloudy yellow appearance, and acid reaction; avoid scratching valuable surfaces during testing.