mineral

Likely tumbled yellow calcite or limestone fragment

Calcite (CaCO₃), possibly micritic limestone

AI-generated identification · may be incorrect

Pale yellow, opaque, matte to weakly waxy luster, with fine layered or granular texture; calcite has Mohs hardness 3, perfect rhombohedral cleavage, and specific gravity about 2.71. The rounded edges indicate tumbling or abrasion.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Calcite precipitates from groundwater, marine sediments, hydrothermal veins, and limestone-forming environments; limestone may range from Paleozoic to modern in age. The specimen’s exact origin cannot be determined from the photograph.

Uses & applications

Calcite is used in cement, lime, aggregate, glass, fillers, and agriculture; attractive pieces are collected or used decoratively. It is generally inexpensive unless unusually transparent, fluorescent, or finely crystallized.

Geological facts

A vinegar or dilute hydrochloric-acid test produces effervescence on fresh surfaces if calcite is present. Yellow coloration may result from iron or organic impurities.

Field identification & locations

Common sources include limestone regions worldwide, especially Mexico, the United States, Brazil, and Europe. Confirm identification with an acid test and hardness test; gypsum or yellow jasper are possible visual alternatives.