sedimentary

Weathered limestone fragment, possibly fossiliferous

Calcite-rich limestone (CaCO₃), possibly bioclastic limestone

AI-generated identification · may be incorrect

Pale cream-white, dull to weakly earthy luster, irregular porous surface and rounded weathering. Likely Mohs hardness 3; calcite has perfect rhombohedral cleavage and specific gravity about 2.7, but the specimen appears heavily weathered and may show fossil or cavity textures.

Identified September 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Limestone forms from accumulated marine or freshwater carbonate sediment, commonly becoming lithified during the Paleozoic–Cenozoic. The holes and rounded shape could reflect dissolved shell material, weathering, or transport abrasion; its precise age cannot be determined from the image.

Uses & applications

Used for aggregate, cement, lime, building stone, and soil neutralization; attractive fossiliferous pieces may be collected, though this fragment has little commercial value.

Geological facts

Calcite-rich limestone effervesces vigorously with dilute hydrochloric acid or vinegar, especially on a freshly scratched surface. The regional setting near 9.7°N, 40.5°E can contain carbonate rocks and transported gravel, so this identification is geologically plausible.

Field identification & locations

Field-test with vinegar/acid: strong fizz supports calcite limestone. A hand lens may reveal shell fragments; distinguish it from pale volcanic rock by its softness and acid reaction.