sedimentary

Light-colored limestone fragment

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

AI-generated identification · may be incorrect

Cream to pale tan, dull to slightly earthy luster, fine-grained and irregularly fractured; calcite hardness is Mohs 3, with weak-to-moderate density. It should effervesce visibly when touched with dilute hydrochloric acid or strong vinegar, especially on a freshly broken surface.

Identified August 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by accumulation and lithification of carbonate mud, shells, or skeletal debris in marine or freshwater settings; its exact geological age cannot be determined from the photograph. Weathering has produced the rough, porous exterior.

Uses & applications

Used extensively for aggregate, cement and lime production, building stone, and soil conditioning; attractive pieces may be collected, but this fragment has little commercial value.

Geological facts

Limestone commonly contains microscopic fossils or carbonate grains that may be invisible externally. Calcite’s acid reaction is the quickest practical confirmation.

Field identification & locations

Common worldwide, especially in former shallow-sea regions; identify it by its pale color, relatively soft surface, and acid fizz, while distinguishing it from quartz-rich sandstone, which will not fizz. Estimated value: typically $0–$5 as an ordinary fragment, or $5–$30 if fossiliferous or unusually attractive.