sedimentary

Weathered limestone

Calcite-rich carbonate rock, primarily CaCO₃ (likely micritic or fossiliferous limestone)

AI-generated identification · may be incorrect

Typically Mohs hardness 3, pale gray to cream, earthy to dull/vitreous luster, massive fine-grained texture, and weak cleavage inherited from calcite. The specimen shows strongly weathered, irregular surfaces; visible fossils are not clear enough for a more specific identification.

Identified September 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms by accumulation and lithification of carbonate mud, shells, or skeletal debris, commonly in shallow marine environments. Its age cannot be determined from the photograph and may range from Paleozoic to Cenozoic depending on locality.

Uses & applications

Used for aggregate, cement and lime production, building stone, and landscape rock; attractive fossiliferous varieties are collected. It is generally not suitable as a gemstone.

Geological facts

Calcite limestone effervesces strongly with dilute hydrochloric acid or vinegar, especially on a freshly scratched surface. Weathering can produce cavities, solution grooves, and karst landscapes.

Field identification & locations

Common worldwide, especially in former seabeds and karst regions. Confirm it in the field by its light color, relatively low hardness, and acid reaction; distinguish dolostone by its weaker reaction unless powdered.