sedimentary

Small pale limestone or calcareous pebble

Likely calcite-rich limestone (primarily CaCO₃); exact identification requires testing

AI-generated identification · may be incorrect

Cream to light gray, rounded, dull and fine-grained with irregular pale markings. Calcite has Mohs hardness 3 and rhombohedral cleavage; the pebble’s hardness and specific gravity cannot be determined from the photo.

Identified October 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from compacted carbonate sediment or shell material, then rounded by water or abrasion. Its age and precise formation environment cannot be identified visually.

Uses & applications

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

Geological facts

A drop of dilute acid typically fizzes on calcite-rich limestone. The visible mottling alone is not enough to confirm the rock type.

Field identification & locations

A rounded, pale pebble with a granular or fossil-like texture is consistent with limestone. Common near streams, beaches, and in regions underlain by carbonate rocks; confirm with an acid test and hardness test.