mineral
Tumbled white/yellow stone, likely calcite or marble
Calcite (CaCO₃), possibly crystalline limestone or marble
AI-generated identification · may be incorrectCreamy 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.
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Physical properties
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.
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.
