sedimentary

Weathered limestone

Calcite-rich carbonate rock (mostly CaCO₃)

AI-generated identification · may be incorrect

Cream-white, dull to earthy luster, porous and strongly weathered; calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.7. The rounded shape and cavities may reflect dissolution or abrasion.

Identified August 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from accumulated marine shells, carbonate mud, or cemented calcite grains, commonly during the Paleozoic–Cenozoic; surface weathering can produce its irregular texture. Exact age and origin require petrographic or chemical testing.

Uses & applications

Used for aggregate, cement, lime, building stone, and soil neutralization; attractive pieces may be collected, though this specimen appears common and unpolished.

Geological facts

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

Field identification & locations

Common in marine sedimentary basins worldwide, including the United States, Europe, and Southeast Asia. Identify by its light color, softness, and acid reaction; distinguish from marble by its sedimentary texture and lack of crystalline sparkle.