sedimentary

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous

AI-generated identification · may be incorrect

Pale gray-beige, dull to earthy luster, fine-grained and irregularly textured; calcite hardness Mohs 3, typically massive with no visible crystal structure. Usually fizzes strongly with dilute hydrochloric acid or vinegar, especially on a fresh surface.

Identified August 25, 2026More sedimentary →

Explore Weathered limestone in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms from accumulated marine carbonate mud, shells, or reef debris, commonly during Paleozoic–Cenozoic sedimentary periods; weathering has produced the rough surface and cavities.

Uses & applications

Used as crushed aggregate, cement and lime feedstock, building stone, and ornamental material; ordinary pieces have little jewelry use.

Geological facts

Limestone is predominantly calcite and may preserve microscopic or macroscopic fossils, though no diagnostic fossil is clearly visible here.

Field identification & locations

Common worldwide in former shallow seas, including Europe, North America, and Southeast Asia. Confirm with an acid test, relatively low hardness, and lack of reaction to a magnet; a close photo cannot establish the exact variety.