sedimentary

Weathered limestone pebble

Limestone, predominantly calcite (CaCO₃)

AI-generated identification · may be incorrect

Pale beige, dull to weakly earthy luster, fine-grained and irregularly porous; Mohs hardness 3, with poor visible cleavage. The rounded shape and surface pitting indicate natural abrasion and weathering.

Identified August 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from compacted marine carbonate sediment, commonly Cenozoic to Paleozoic in age, then eroded into a pebble by water or glacial transport. The image cannot determine its exact formation age or source.

Uses & applications

Used for aggregate, cement and lime production, construction stone, landscaping, and decorative specimens; this small ordinary pebble has negligible commercial value.

Geological facts

Calcite-rich limestone effervesces visibly with dilute hydrochloric acid or strong vinegar, though vinegar may react slowly. It is softer than steel and can be scratched by a knife.

Field identification & locations

Common worldwide, especially in marine sedimentary basins, river gravels, beaches, and glacial deposits. Confirm with a dilute-acid fizz test and a scratch test; avoid confusing it with concrete or pale sandstone.