sedimentary

Small, weathered limestone pebble (tentative)

Limestone, composed chiefly of calcite (CaCO₃); exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

Pale cream-gray, rounded, dull and fine-grained, with irregular surface cracks or markings. Typical limestone has Mohs hardness 3, calcite crystals, and specific gravity about 2.3–2.7; this image does not reveal diagnostic cleavage or grain details.

Identified October 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from accumulated carbonate mud or shell fragments, then lithified and rounded by transport and weathering. Its age and original depositional environment cannot be determined from appearance alone.

Uses & applications

Limestone is widely used in cement and lime production, aggregate, and building stone; this small pebble has little practical or jewelry value.

Geological facts

A drop of dilute acid typically fizzes on calcite-rich limestone, though coatings or low calcite content can obscure the reaction.

Field identification & locations

The rounded shape suggests abrasion in a stream, on a beach, or in sediment; look for shell fragments or calcite-rich texture and test for fizz only with appropriate safety precautions. A precise identification would require close inspection or simple tests.