sedimentary

Polished limestone pebble

Calcite-rich limestone (CaCO₃)

AI-generated identification · may be incorrect

Cream to pale tan, fine-grained, matte-to-waxy surface with brown veining and fractures; calcite hardness is Mohs 3, with nonmetallic luster and rhombohedral cleavage. The rounded shape indicates natural abrasion or tumbling/polishing.

Identified August 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted and cemented carbonate mud or marine shell material, commonly during the Paleozoic–Mesozoic eras; later rounded in a stream, beach, or glacial environment. Exact age and locality cannot be determined from the image.

Uses & applications

Used as aggregate, dimension stone, cement and lime feedstock, and decorative pebble material; this specimen is mainly suitable for display or craft use.

Geological facts

Calcite-rich limestone effervesces strongly with dilute hydrochloric acid or vinegar, though polished surfaces may react slowly. Brown lines are likely iron-oxide staining along healed or open fractures.

Field identification & locations

Identify it by its light color, soft scratchability, carbonate reaction, and absence of visible interlocking crystals; common worldwide, especially in former marine basins. Avoid prolonged acid exposure if it is kept as a polished specimen.