sedimentary

Weathered limestone

Micritic limestone, primarily calcium carbonate (CaCO₃; calcite)

AI-generated identification · may be incorrect

Cream to tan, dull-to-waxy luster, fine-grained and massive, with irregular pits and possible fossil or solution cavities. Calcite hardness is Mohs 3; it commonly reacts vigorously with dilute hydrochloric acid or vinegar, though weathering may mute the reaction.

Identified September 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted and cemented carbonate mud or skeletal debris in a shallow marine environment, likely deposited during the Phanerozoic and later uplifted and weathered. The rounded shape and softened surface indicate transport or natural abrasion.

Uses & applications

Used as aggregate, cement and lime feedstock, building stone, and landscaping material; attractive pieces may be collected, but this specimen appears ordinary and unpolished.

Geological facts

Limestone is one of Earth’s most widespread sedimentary rocks and commonly preserves marine fossils. Cavities can result from dissolution of shells or other carbonate grains.

Field identification & locations

Look for a pale color, very fine texture, carbonate veins or fossils, and acid effervescence; distinguish it from marble by its sedimentary texture and lack of interlocking crystalline grains. Common in former shallow-sea basins worldwide.