sedimentary

Polished fossil-bearing limestone pebble

Bioclastic limestone, chiefly calcite (CaCO₃), possibly containing a small shell or coral fragment

AI-generated identification · may be incorrect

Hardness about 3 Mohs; olive-tan, fine-grained, dull to subtly satin luster, with cream fossil/inclusion patches and natural fractures. Calcite-rich material effervesces strongly with dilute hydrochloric acid or vinegar, though polished surfaces may react slowly.

Identified September 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted and cemented marine carbonate mud and skeletal debris, generally deposited in shallow seas; its precise geological age cannot be determined from the photograph. Polishing and shaping are human processing, but the specimen itself is natural limestone.

Uses & applications

Used as a decorative pebble, teaching specimen, or small fossil collectible; limestone is also important for cement, aggregate, lime, and dimension stone. This individual has modest commercial value.

Geological facts

The pale rounded features may be shell fragments, ooids, or weathered mineral-filled cavities rather than true fossils. The dark hole could be a vug, boring, or inclusion exposed by polishing.

Field identification & locations

Common in sedimentary terrains and gravel beds derived from marine limestones, especially areas formerly covered by shallow seas. Look for abundant calcite, soft scratchability, carbonate fizz, and visible biogenic textures.