sedimentary

Weathered, fossiliferous limestone pebble (possible fossil-bearing concretion)

Calcite-dominant limestone; commonly composed of calcite (CaCO₃), potentially with fossil fragments and clay or other impurities

AI-generated identification · may be incorrect

Rounded, gray-beige pebble with a rough, weathered surface and a dark central depression or inclusion; likely Mohs hardness 3, dull to earthy luster, and no obvious crystal faces. A photograph alone cannot confirm the dark feature or exact composition.

Identified October 16, 2026More sedimentary →

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At a glance

Common name: Weathered, fossiliferous limestone pebble (possible fossil-bearing concretion)
Scientific name: Calcite-dominant limestone; commonly composed of calcite (CaCO₃), potentially with fossil fragments and clay or other impurities
Category: sedimentary
Identified: October 16, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an ordinary pebble; more only if a fossil or distinctive feature is verified.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Limestone forms from accumulated carbonate mud, shells, or other biological material, later compacted and cemented; its age and depositional setting cannot be determined from the image.

Uses & applications

Limestone is widely used for cement, aggregate, and building stone; this small pebble is mainly suitable for collecting or display.

Geological facts

Calcite-rich limestone typically fizzes when exposed to dilute acid, though weathering or impurities can reduce the reaction.

Field identification & locations

Look for shell or fossil textures and test a fresh spot with dilute acid; limestone is common in ancient marine sedimentary regions worldwide. The dark center may be a cavity or inclusion, not a confirmed fossil.