sedimentary

Weathered limestone

Calcite-rich carbonate rock; primarily CaCO₃

AI-generated identification · may be incorrect

Typically Mohs hardness 3, white to cream/yellow-brown, earthy to dull luster, fine- to coarse-grained calcite, and weak rhombohedral cleavage. The rough surface and ochre coloration suggest iron-oxide staining and weathering.

Identified September 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms from accumulated marine carbonate shells, lime mud, or chemical precipitation, commonly during Paleozoic–Cenozoic sedimentary periods. Weathering, dissolution, and iron staining produced the irregular exterior.

Uses & applications

Used for aggregate, cement and lime manufacture, building stone, and soil neutralization; attractive pieces may be collected but are usually low-value.

Geological facts

Calcite-rich limestone effervesces vigorously with dilute hydrochloric acid or household vinegar, especially on a freshly scratched surface. It commonly preserves fossils, though none are clearly visible here.

Field identification & locations

Identify it by its pale color, relatively low hardness, and acid reaction; it can be scratched with a steel nail or knife. Common worldwide in former marine basins, including Europe, North America, and parts of Asia.