sedimentary

Weathered limestone fragment

Calcite-rich limestone (CaCO₃), possibly chalky or fossiliferous limestone

AI-generated identification · may be incorrect

Cream to pale gray, dull to finely crystalline, with irregular weathering; Mohs hardness 3, poor or indistinct cleavage, and specific gravity about 2.7. It should effervesce strongly with dilute hydrochloric acid or vinegar, though the latter is weaker.

Identified August 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted marine carbonate mud, shells, or skeletal debris, commonly during Paleozoic–Cenozoic shallow-marine deposition; the exact age cannot be determined from the image.

Uses & applications

Used as crushed aggregate, dimension stone, cement and lime feedstock, soil conditioner, and occasionally as a low-value decorative or fossil-bearing specimen.

Geological facts

Limestone is dominated by calcite and can recrystallize into marble. Its pale, porous appearance and rounded weathering are consistent with a naturally weathered outdoor fragment.

Field identification & locations

Common in sedimentary terrains and glacial or construction fill; identify by its light color, relatively soft surface, and acid fizz. The image does not show diagnostic fossils or textures for a more specific identification.