sedimentary

Weathered light-colored rock pebble, possibly limestone

Likely micritic limestone (calcium carbonate, CaCO₃); exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

Pale gray-beige, rounded, dull and fine-grained with dark surface staining; hardness about 3 Mohs if limestone. No distinct crystal faces are visible.

Identified October 2, 2026More sedimentary →

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At a glance

Common name: Weathered light-colored rock pebble, possibly limestone
Scientific name: Likely micritic limestone (calcium carbonate, CaCO₃); exact identification is uncertain from the photograph
Category: sedimentary
Identified: October 2, 2026
Method: Standard

AI Estimated Value

About $0–$2 as an ordinary pebble; a specimen with distinctive fossils or provenance may be worth more.

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

Pale gray-beige, rounded, dull and fine-grained with dark surface staining; hardness about 3 Mohs if limestone. No distinct crystal faces are visible.

Formation & geological history

If limestone, it formed from compacted carbonate mud or marine organisms in a sedimentary environment, potentially millions to hundreds of millions of years ago; weathering and transport rounded it.

Uses & applications

Common limestone is used for aggregate, cement, and building stone. This small, unremarkable pebble has little commercial or collector value.

Geological facts

Limestone fizzes with dilute acid when it contains calcite, a useful field clue; the image alone cannot confirm the rock type.

Field identification & locations

Look for a carbonate-rich fine texture and test a fresh surface with dilute acid; hardness and a streak test can help distinguish it from other pale rocks. Limestone is widespread, especially in former marine sedimentary regions.