mineral

Tumbled yellow-orange calcite

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Typically honey-yellow to orange, translucent to opaque, with a vitreous-to-waxy luster; Mohs hardness 3, rhombohedral crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71. The smoothly rounded surface indicates tumbling and may obscure natural cleavage.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary limestones, hydrothermal veins, caves, and metamorphic marbles through precipitation or recrystallization. Its age depends on the deposit, ranging from modern cave growth to ancient Paleozoic and older rocks.

Uses & applications

Used for cement, lime, construction aggregate, soil treatment, and chemical processing; attractive transparent or vividly colored pieces are sold as decorative or collecting specimens rather than jewelry due to low hardness.

Geological facts

Yellow coloration commonly results from iron or other trace impurities. Calcite effervesces strongly with dilute hydrochloric acid, distinguishing it from many similar yellow stones.

Field identification & locations

Common worldwide, including Mexico, the United States, Iceland, China, and Peru. Confirm with a hardness test against a copper coin or steel, acid fizz, and rhombohedral cleavage; avoid scratching polished surfaces.