sedimentary

Weathered limestone pebble

Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or oolitic

AI-generated identification · may be incorrect

Cream-white, dull to earthy luster, fine-grained and rounded; calcite hardness Mohs 3, generally massive with no visible crystal structure. Likely reacts vigorously with dilute hydrochloric acid or household vinegar, especially on a freshly scratched surface.

Identified August 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms from accumulated marine carbonate mud, shells, or chemically precipitated calcite, commonly during Paleozoic–Cenozoic seas; the rounded shape indicates transport and abrasion in a river, beach, or gravel deposit.

Uses & applications

Used for cement, lime, aggregate, building stone, and soil neutralization; attractive pieces may be collected, though this specimen appears common and unpolished.

Geological facts

The dark circular patches may be fossil fragments, iron/manganese staining, or weathered inclusions; image resolution prevents reliable fossil identification.

Field identification & locations

Look for soft white powder when scratched with a steel nail and fizzing in acid; distinguish it from quartz, which is much harder and does not fizz. Common worldwide, especially in former marine basins and limestone regions.