sedimentary

Polished fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

AI-generated identification · may be incorrect

Typically Mohs hardness 3, pale pink to reddish-brown, dull to waxy or polished luster, and fine-grained carbonate matrix containing rounded fossil cavities or shell fragments. It is non-cleavable, relatively soft, and reacts vigorously with dilute hydrochloric acid.

Identified September 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from accumulated marine shells and skeletal debris that lithified into limestone, commonly during the Paleozoic or Mesozoic eras; exact age cannot be determined from the image. Polishing has smoothed and enhanced the fossil-bearing surface.

Uses & applications

Used as a decorative stone, paper/cement raw material, aggregate, and ornamental or collectible material; rarely used as a gemstone. Small polished pieces generally have modest value.

Geological facts

The circular markings likely represent fossil cross-sections, molds, or bioclasts rather than mineral crystals. Calcite-rich limestone can often be distinguished from chert or jasper by its acid reaction and lower hardness.

Field identification & locations

Common in marine sedimentary basins worldwide, including Europe, North America, North Africa, and Asia. Test an inconspicuous spot with dilute acid; scratching with a steel knife and observing fossil structure can help confirm it.