mineral

Tumbled cream-colored stone, likely calcite or marble

Calcite (CaCO₃), possibly recrystallized as marble

AI-generated identification · may be incorrect

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.

Identified August 25, 2026More mineral →

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Physical properties

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.