sedimentary

Weathered limestone

Calcite-rich limestone, chiefly calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Tan to gray, dull, rough and fine-grained; commonly dominated by calcite (Mohs 3), with possible clay or other impurities. The photo does not show diagnostic crystals or fossils clearly enough for a more specific identification.

Identified September 26, 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 when carbonate mud, shells, or other calcium-carbonate material accumulates and lithifies in marine or lake settings. Its age cannot be determined from the image.

Uses & applications

Used for cement and lime, aggregate, building stone, and agricultural soil treatment; this rough, weathered material has little jewelry value.

Geological facts

Calcite-rich limestone fizzes when a drop of dilute acid is applied, though weathering or coatings can make the reaction subtle.

Field identification & locations

The pale, blocky, sedimentary-looking fragments are consistent with limestone, but visual identification is uncertain; confirm with an acid test or expert examination. Limestone occurs widely in sedimentary basins worldwide.