sedimentary

Weathered limestone

Calcite-rich carbonate rock; primarily CaCO₃

AI-generated identification · may be incorrect

Typically pale gray, tan, or brown with a dull to earthy luster; calcite hardness is 3, with irregular fracture and little visible crystal structure. Effervesces noticeably with dilute hydrochloric acid or strong vinegar, especially on a freshly scratched surface.

Identified August 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms mainly from accumulated marine shells, carbonate mud, or chemical precipitation, commonly during Paleozoic–Cenozoic sedimentary deposition. The rough surface reflects weathering, dissolution, and possible fossil or bedding remnants.

Uses & applications

Used for crushed stone, road aggregate, cement and lime production, building stone, and agricultural soil amendment. Ordinary weathered pieces have little jewelry value.

Geological facts

Limestone is one of the most widespread sedimentary rocks and can develop caves, sinkholes, and karst landscapes through carbonic-acid dissolution.

Field identification & locations

Common in marine sedimentary basins worldwide, including the United States, Europe, and the Middle East. Confirm identification by its relatively soft surface and acid fizz; dolostone may fizz weakly unless powdered.