sedimentary

Likely weathered limestone fragment

Limestone, composed mainly of calcite (CaCO₃)

AI-generated identification · may be incorrect

Small, rough, pale gray-green fragment with an irregular shape and dull surface; limestone is typically Mohs 3, nonmetallic, and may fizz in dilute acid. The photo does not show enough detail to confirm its composition or crystal texture.

Identified September 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Limestone forms from accumulated carbonate shells, sediment, or chemical precipitation, then lithifies; deposits range from recent to billions of years old. This fragment’s source and age cannot be determined from the image.

Uses & applications

Commonly used as building stone, aggregate, cement and lime feedstock; this small piece has little practical or jewelry value.

Geological facts

Calcite-rich limestone reacts with dilute hydrochloric acid, producing visible fizzing; a scratch test alone is not diagnostic.

Field identification & locations

Its pale color and uneven, apparently granular surface are consistent with weathered limestone, but several rocks can look similar. Identification would require close inspection or simple tests; limestone is widespread in sedimentary regions worldwide.