sedimentary

Tumbled limestone pebble

Micritic limestone, chiefly calcium carbonate (CaCO₃; calcite)

AI-generated identification · may be incorrect

Soft, pale gray to cream, matte and fine-grained with small pores and weathering pits; Mohs hardness 3, nonmetallic luster, generally massive rather than visibly crystalline, and no obvious cleavage. It should effervesce strongly with dilute hydrochloric acid or vinegar if calcitic.

Identified August 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted lime mud or microscopic marine shells, later lithified in a shallow-marine carbonate environment; its exact geological age cannot be determined from the photograph. Rounded edges indicate stream, beach, or deliberate tumbling abrasion.

Uses & applications

Used for aggregate, cement and lime production, dimension stone, soil treatment, and landscaping; this small specimen has modest decorative or educational value.

Geological facts

Limestone commonly preserves fossils and dissolves readily in weak acids, producing karst caves and sinkholes. The porous texture may also indicate weathered carbonate rock or a coral-rich limestone.

Field identification & locations

Common worldwide, especially in former shallow seas and carbonate platforms; major sources include the Mediterranean, Caribbean, Gulf Coast, and European limestone belts. Test acid reaction and inspect a fresh surface for calcite grains or fossils.