sedimentary

Small rounded limestone pebble

Micritic limestone, chiefly calcite (CaCO₃); possibly an oolitic or fossiliferous limestone fragment

AI-generated identification · may be incorrect

Tan, rounded, and fine-grained with a dull to slightly earthy luster; calcite hardness is Mohs 3, with indistinct cleavage in the rock. It should effervesce strongly with dilute hydrochloric acid or vinegar if calcitic.

Identified September 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from compacted carbonate mud or tiny carbonate grains in a shallow marine environment, then rounded by water or abrasion. The image cannot establish a precise age or locality; limestone ranges from recent to Precambrian.

Uses & applications

Used as aggregate, cement and lime feedstock, building stone, and landscaping material; this small specimen has mainly educational or casual collecting value.

Geological facts

The rounded shape indicates transport or deliberate tumbling, while the granular texture may reflect ooids, shell debris, or recrystallized carbonate.

Field identification & locations

Test with acid, inspect with a hand lens for fossils or concentric ooids, and compare its scratch resistance with a steel knife. Common worldwide, especially in former shallow seas and limestone river gravels.