sedimentary

Weathered limestone, possibly fossiliferous

Calcite-rich limestone (primarily CaCO₃); exact identification requires examination

AI-generated identification · may be incorrect

Pale yellow-tan, dull and earthy, with an irregular, weathered surface and possible fossil or shell impressions. Limestone is typically Mohs 3, has calcite’s trigonal crystal structure, and may fizz in dilute acid; hardness and structure are not confirmable from the image.

Identified October 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Usually forms from accumulated marine carbonate shells, skeletal debris, or chemical precipitation, then lithifies; age and specific environment cannot be determined from appearance alone.

Uses & applications

Used as aggregate, building stone, cement and lime feedstock; fossiliferous pieces may be kept as curiosities.

Geological facts

Calcite-rich limestone reacts with dilute hydrochloric acid, producing visible fizzing; avoid testing valuable specimens without permission.

Field identification & locations

Look for a relatively soft, pale stone that fizzes with dilute acid and may preserve shell fragments. Limestone occurs worldwide, especially in former marine sedimentary basins.