sedimentary

Weathered fossiliferous limestone pebble

Fossiliferous limestone, composed chiefly of calcite (CaCO₃)

AI-generated identification · may be incorrect

Brown-gray, fine-grained, dull to slightly sparkly, with possible fossil fragments or shell-like textures; calcite has Mohs hardness 3, but weathering and grain size can make a hand specimen seem harder. The image alone does not confirm fossils or exact composition.

Identified October 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from accumulated marine carbonate sediments that lithified and were later rounded by water; its geological age cannot be determined from the photo.

Uses & applications

Limestone is widely used for cement, lime, and building stone; this small pebble is mainly of educational or modest collecting interest.

Geological facts

Limestone commonly preserves shells and other marine fossils, though surface patterns can also result from weathering.

Field identification & locations

A dilute acid fizz test can indicate calcite-rich limestone; look for visible shell fragments and a scratchable surface. Limestone occurs in sedimentary basins worldwide.