sedimentary

Weathered rock fragment (likely limestone)

Calcite-rich limestone, composition and identity uncertain from the image

AI-generated identification · may be incorrect

Pale tan-gray, rough and porous with a dull, earthy luster; likely mainly calcite (Mohs 3), but grain size, cleavage, and density cannot be reliably determined visually.

Identified October 6, 2026More sedimentary →

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Physical properties

Pale tan-gray, rough and porous with a dull, earthy luster; likely mainly calcite (Mohs 3), but grain size, cleavage, and density cannot be reliably determined visually.

Formation & geological history

If limestone, it formed from accumulated carbonate sediment or shell material and was later lithified; its age and exact formation environment cannot be determined from the image.

Uses & applications

Ordinary fragments have little commercial value; limestone is widely used as construction aggregate, cement and lime feedstock, and building stone.

Geological facts

The irregular shape and weathered surface are not diagnostic; several sedimentary and weathered rocks can look similar.

Field identification & locations

A definitive field identification needs tests: limestone typically fizzes when a drop of dilute acid is applied to a fresh surface and scratches with a steel nail. Common worldwide, especially in regions underlain by carbonate bedrock.