sedimentary

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃)

AI-generated identification · may be incorrect

Soft, pale cream to yellow-gray, earthy and dull; calcite hardness Mohs 3, usually massive with indistinct crystals and no visible cleavage in this fragment. It should fizz briskly with dilute hydrochloric acid or vinegar, though weathering may reduce the reaction.

Identified August 12, 2026More sedimentary →

Explore Weathered limestone fragment 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

Likely formed from accumulated marine carbonate shells or chemical carbonate mud, later compacted and cemented; age cannot be determined from the image. Weathering has produced the rough, porous surface.

Uses & applications

Used for aggregate, cement, lime, building stone, and soil amendment; this small irregular piece has negligible commercial or jewelry value.

Geological facts

Limestone is one of Earth’s most widespread sedimentary rocks and commonly preserves fossils, although none are clearly visible here.

Field identification & locations

Common in marine sedimentary terrains worldwide; identify by its pale color, relatively low hardness, powdery texture, and acid effervescence. Estimated value: $0–$5 as an ordinary specimen, potentially $5–$20 if fossiliferous or locality-labeled.