mineral

Tumbled yellow calcite

Calcite, CaCO₃

AI-generated identification · may be incorrect

Pale yellow, rounded and opaque-to-translucent with a waxy to vitreous luster; Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage. The pictured stone’s color and surface are consistent with tumbled calcite, though image identification is not definitive.

Identified October 4, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary settings, hydrothermal veins, and caves; yellow coloration commonly comes from trace impurities. Calcite has formed throughout Earth’s history, rather than having one specific geological age.

Uses & applications

Used as a decorative and collecting stone; calcite is also important in cement, lime, and agricultural applications. This soft specimen is generally unsuitable for durable jewelry.

Geological facts

Calcite fizzes in dilute acid and is readily scratched by a copper coin or knife, useful checks for distinguishing it from harder look-alikes.

Field identification & locations

Look for low hardness, rhombohedral cleavage, and acid reaction; calcite occurs worldwide in limestone, marble, and veins. Tumbling rounds its edges and may obscure natural cleavage.