mineral
Tumbled cream-colored stone, likely calcite or marble
Calcite (CaCO₃), possibly recrystallized as marble
AI-generated identification · may be incorrectCream to pale yellow, opaque, smooth tumbled surface, with a dull to weakly vitreous luster. Calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.71; the image alone cannot confirm composition.
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Physical properties
Cream to pale yellow, opaque, smooth tumbled surface, with a dull to weakly vitreous luster. Calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.71; the image alone cannot confirm composition.
Formation & geological history
Calcite forms in sedimentary limestones, hydrothermal veins, and caves; marble forms when limestone recrystallizes during metamorphism. Ages vary widely from Precambrian to recent.
Uses & applications
Used for cement, lime, aggregate, and decorative stone; attractive tumbled pieces are sold for casual collecting and ornamental use.
Geological facts
Calcite effervesces visibly with dilute hydrochloric acid, unlike most quartz. Its rhombohedral cleavage and relatively low hardness distinguish it from common quartz pebbles.
Field identification & locations
Test cautiously by scratching with a steel blade or copper coin and applying dilute acid to an inconspicuous spot; strong fizz indicates calcite. Common worldwide, especially in limestone regions.
