Rock Identifier
Weathered limestone fragment (Calcite-rich limestone (CaCO₃), possibly chalky or fossiliferous limestone) — sedimentary
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 More sedimentary
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Physical properties

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.

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.