sedimentary

Likely weathered limestone pebble

Micritic limestone, mainly calcite (CaCO₃)

AI-generated identification · may be incorrect

Small rounded tan-gray pebble with dark pits or inclusions and a dull, earthy luster. Limestone is Mohs hardness 3, has no obvious cleavage in fine-grained pieces, and typically fizzes with dilute hydrochloric acid or vinegar (more slowly).

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably formed from compacted carbonate mud or fossil debris in a shallow marine sedimentary environment, then rounded by stream or surface transport. The specimen’s exact age cannot be determined visually; limestone is common in the Mesozoic and Paleozoic rocks of the western Balkans.

Uses & applications

Ordinary limestone is used for crushed aggregate, cement, lime, building stone, and soil treatment; this small pebble has mainly educational or curiosity value.

Geological facts

The holes may reflect weathering, dissolution of fossil fragments, or small cavities filled with darker material. A hard steel nail should not scratch it easily, while a copper coin may scratch it.

Field identification & locations

The reported area near 44.4°N, 18.6°E in Bosnia and Herzegovina contains widespread carbonate rocks, making limestone regionally plausible. Test an inconspicuous spot with vinegar for effervescence; a fresh broken surface and magnification would improve identification.