sedimentary

Small pale stone pebble, likely limestone

Likely calcite-rich limestone (CaCO₃); exact identification is uncertain from the image alone

AI-generated identification · may be incorrect

Small, rounded, off-white to light gray pebble with a dull, fine-grained surface and a visible fracture or layered edge. If limestone, calcite has Mohs hardness 3 and rhombohedral cleavage; the pebble’s hardness and density cannot be determined visually.

Identified October 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from carbonate sediment that lithified into limestone, then was rounded by water or abrasion. Its geological age and source are not identifiable from the photograph.

Uses & applications

A common pebble with little commercial value; suitable for collecting or craft use. Limestone is widely used in cement, aggregate, and construction.

Geological facts

A drop of dilute acid fizzes on exposed calcite-rich limestone, a useful field clue. Hardness testing or a fresh surface would help distinguish it from pale quartzite or other stones.

Field identification & locations

Rounded shape suggests transport or weathering; pale color and apparent fine grain are consistent with limestone but not diagnostic. Similar pebbles occur in riverbeds, beaches, and glacial deposits.