mineral

Tumbled white/yellow stone, likely calcite or marble

Calcite (CaCO₃), possibly crystalline limestone or marble

AI-generated identification · may be incorrect

Creamy white to pale yellow, opaque, smooth and rounded from tumbling, with a vitreous-to-pearly luster. Calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.7; the image is insufficient for certainty.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary limestones, hydrothermal veins, and caves; marble is recrystallized limestone formed during metamorphism. Geological ages vary widely, from ancient Precambrian rocks to young cave deposits.

Uses & applications

Used for cement, lime, aggregate, and decorative stone; attractive tumbled pieces are sold as inexpensive collectibles or metaphysical stones.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar, though vinegar may react slowly. Marble generally reacts too, but its crystals may appear sugary under magnification.

Field identification & locations

Common worldwide, especially in limestone regions; likely identification requires a hardness test, acid test, and magnification. A steel knife should scratch it, while it should not scratch glass.