sedimentary

Fossiliferous limestone pebble

Calcite-rich limestone, CaCO₃, with possible fossil or shell fragments

AI-generated identification · may be incorrect

Mostly cream, tan, and gray, with a dull to slightly crystalline surface and irregular cavities/veins. Calcite is Mohs 3 and reacts with dilute acid; the pebble’s rounded shape reflects water wear. Exact mineral proportions and fossil identity cannot be determined from the image alone.

Identified September 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed as carbonate sediment in a marine environment, later lithified and rounded by transport in water. Its age cannot be established visually.

Uses & applications

Limestone is used for cement, aggregate, and building stone; this small specimen is mainly suitable for collecting or display.

Geological facts

The pale areas may be calcite-rich material, while the holes could be weathered fossil structures or ordinary cavities; appearance alone does not confirm a fossil.

Field identification & locations

Look for shell-like patterns, repeated biological structure, and fizzing with dilute hydrochloric acid (use safely); common limestone pebbles occur on beaches and riverbeds. A firm identification would require closer examination.