sedimentary

Weathered limestone pebble

Calcite-rich limestone, chiefly calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Pale cream to tan, dull and rough, with a granular or pitted surface; likely Mohs hardness 3, though impurities can affect it. Limestone is commonly microcrystalline calcite with no prominent cleavage visible in this pebble.

Identified October 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from accumulated carbonate mud, shells, or other marine sediments that lithified; its age and precise environment cannot be determined from the image. The rounded shape suggests abrasion during transport by water or other geological processes.

Uses & applications

Limestone is used for cement and lime, aggregate, and building stone; this small pebble has mainly decorative or teaching value.

Geological facts

Calcite-rich limestone effervesces in dilute acid, especially on a freshly scratched surface.

Field identification & locations

A light-colored, relatively soft stone that may fizz with dilute acid is a useful field clue. Similar pebbles occur in river, beach, and limestone-terrain deposits; the image alone cannot confirm the identification.