sedimentary

Rounded limestone pebble

Limestone, chiefly calcite (CaCO₃)

AI-generated identification · may be incorrect

Creamy tan, fine-grained and dull to slightly waxy, with rounded water-worn surfaces; calcite hardness is about 3 Mohs, and limestone has no consistent cleavage as a rock. The image alone cannot confirm its composition; a fizz with dilute acid would support limestone identification.

Identified October 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from carbonate sediment that lithified, then was rounded by transport in water. Its depositional age cannot be determined from the photograph.

Uses & applications

Common limestone is used for aggregate, cement, and building stone; this small pebble is mainly suitable for collecting or decoration.

Geological facts

Limestone may contain fossils, but none are clearly visible here.

Field identification & locations

Its smooth, rounded shape suggests stream or beach transport; check for acid fizz and a relatively soft scratch response to distinguish it from lookalike pebbles. Limestone is widespread worldwide.