sedimentary

Weathered limestone pebble

Limestone, primarily calcite (CaCO₃)

AI-generated identification · may be incorrect

Typically Mohs hardness 3, white to beige, dull to weakly earthy luster, and fine-grained or microcrystalline texture; cleavage is not usually visible. The rounded form and gray veining suggest natural weathering and possible fossil or stylolitic markings.

Identified August 11, 2026More sedimentary →

Explore Weathered limestone pebble 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

Formed from compacted carbonate mud, shells, or biological debris in shallow marine settings, commonly during the Paleozoic–Mesozoic eras. Its smooth shape indicates transport and abrasion in a river, beach, or glacial environment.

Uses & applications

Used extensively for cement, lime, aggregate, building stone, and landscaping; attractive pieces may be collected or polished. This specimen appears primarily ornamental rather than gem-quality.

Geological facts

Calcite-rich limestone effervesces vigorously with dilute hydrochloric acid or household vinegar, especially on a freshly scratched surface. Surface marks may be mineral veins, weathering patterns, or indistinct fossil traces.

Field identification & locations

Identify it by its pale color, relatively low hardness, and acid reaction; it should scratch with a steel knife and generally not scratch glass. Common worldwide, especially in former shallow-sea regions and carbonate river gravels.