mineral
Yellow calcite (tumbled)
Calcite, CaCO₃
AI-generated identification · may be incorrectGolden-yellow to ochre, opaque, with a vitreous to waxy luster and visible cleavage surfaces; Mohs hardness 3, trigonal crystal system, specific gravity about 2.7. The exact identification is uncertain from the photo alone.
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Physical properties
Golden-yellow to ochre, opaque, with a vitreous to waxy luster and visible cleavage surfaces; Mohs hardness 3, trigonal crystal system, specific gravity about 2.7. The exact identification is uncertain from the photo alone.
Formation & geological history
Calcite forms in sedimentary settings, hydrothermal veins, and cavities; yellow color commonly comes from trace impurities. Calcite occurs in rocks of many ages.
Uses & applications
Used in cement, lime, soil treatment, and as a decorative or collector stone; this small tumbled piece is mainly ornamental.
Geological facts
Calcite effervesces readily in dilute hydrochloric acid and can be scratched with a copper coin or knife. Yellow calcite is sometimes marketed as “honey calcite.”
Field identification & locations
Look for softness, prominent cleavage, and strong acid reaction; these help distinguish it from harder yellow quartz. Calcite is widespread worldwide, including in limestone and marble regions.
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