sedimentary

Rounded pale pebble, likely limestone or calcite-rich stone

Limestone (primarily calcite, CaCO₃), provisional identification

AI-generated identification · may be incorrect

Cream to yellow-beige, smooth and rounded with a dull to weakly waxy luster; likely Mohs hardness 3–4 and low-to-moderate specific gravity (~2.3–2.7). Crystal structure is mostly microscopic calcite grains, so cleavage is not obvious; it should fizz with dilute hydrochloric acid or vinegar if calcitic.

Identified August 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably formed from compacted marine carbonate sediment or limestone fragments and later rounded by water or abrasion; age cannot be determined from the image. Similar pebbles commonly form in river, beach, and karst environments.

Uses & applications

Common limestone is used for aggregate, cement, lime, soil treatment, and building stone; attractive polished pieces may be used decoratively. This small specimen has minimal commercial value.

Geological facts

The uniform rounded shape indicates transport or tumbling rather than a crystal habit. Yellow coloration may result from iron-oxide staining or weathering.

Field identification & locations

Common in limestone regions, river gravels, and beaches; test with acid, inspect for fossil fragments, and compare streak (white) and hardness against a steel nail. Estimated value: $1–$5 as an ordinary pebble, potentially $5–$20 if unusually attractive or fossiliferous.