sedimentary

Polished fossiliferous limestone (likely coral-bearing)

Calcite-rich limestone, primarily CaCO₃; fossil identity is uncertain from the image

AI-generated identification · may be incorrect

Smooth, rounded gray-tan stone with pale fossil-like patches and yellow-brown staining; calcite hardness 3 Mohs, typically dull to slightly waxy, with no visible crystal structure in the fine-grained matrix.

Identified October 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from carbonate mud and skeletal material deposited in a marine setting, later compacted and lithified; the specimen’s age cannot be determined from appearance alone.

Uses & applications

Often collected or used as a decorative polished stone; limestone is also widely used for cement, aggregate, and building stone.

Geological facts

The pale inclusions may be fossil fragments or mineral-filled cavities; a photo alone cannot establish their identity.

Field identification & locations

Look for fizzing with dilute acid (calcite) and visible shell or coral textures; limestone occurs in sedimentary basins worldwide. Estimated value: about $2–$15 as a small polished specimen.