sedimentary

Large pale limestone boulder

Limestone, chiefly calcite (CaCO₃); exact variety cannot be determined from the photo

AI-generated identification · may be incorrect

Massive, pale gray-white, dull to slightly earthy surface with irregular weathering; no obvious crystals or layering. Calcite hardness is about 3 Mohs, but the boulder’s texture and composition need testing to confirm.

Identified October 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from accumulated carbonate sediment or biological remains, later compacted and cemented; age and depositional setting cannot be inferred from the image.

Uses & applications

Limestone is widely used for cement and lime, aggregate, building stone, and soil treatment; this weathered boulder is mainly of landscape or local geological interest.

Geological facts

Limestone commonly reacts with dilute acid, often fizzing as calcite releases carbon dioxide. A small inconspicuous scratch or acid test can help distinguish it from pale quartz-rich rock.

Field identification & locations

The broad, chalky-looking surface and massive form are consistent with limestone, but field confirmation requires a fresh surface and tests. Limestone is widespread worldwide, especially in former shallow marine regions.