sedimentary

Likely fossiliferous limestone fragment

Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Pale beige, dull and fine-grained with an irregular, pitted surface; calcite has Mohs hardness 3 and rhombohedral cleavage. The specimen’s texture and composition cannot be confirmed visually alone.

Identified October 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Limestone forms when carbonate mud or shell material accumulates and lithifies, commonly in warm, shallow seas; its age cannot be determined from the image.

Uses & applications

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

Geological facts

Calcite-rich limestone fizzes with dilute hydrochloric acid, a useful identification test; a visible fossil or diagnostic structure is not clear here.

Field identification & locations

Look for a pale, relatively soft rock that scratches easily and reacts to dilute acid. Limestone occurs widely in sedimentary basins; estimated value for a small ordinary fragment is about $1–$10.