sedimentary

Weathered sandstone or limestone pebble

Likely quartz-rich sandstone (clastic sedimentary rock) or porous limestone; exact identification requires testing

AI-generated identification · may be incorrect

Tan-gray, dull to earthy luster, fine-grained and rounded, with visibly porous/weathered texture; likely Mohs hardness ~3–7 depending on composition, with no obvious cleavage or crystals.

Identified September 13, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or limestone pebble
Scientific name: Likely quartz-rich sandstone (clastic sedimentary rock) or porous limestone; exact identification requires testing
Category: sedimentary
Identified: September 13, 2026
Method: Standard

AI Estimated Value

Typically $0–$10 as an ordinary collected pebble; up to about $10–$30 if unusually shaped, locality-labeled, or sold as a teaching specimen.

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

Tan-gray, dull to earthy luster, fine-grained and rounded, with visibly porous/weathered texture; likely Mohs hardness ~3–7 depending on composition, with no obvious cleavage or crystals.

Formation & geological history

Formed from cemented sediment or carbonate mud, then rounded by stream, beach, or glacial transport; age cannot be determined from the photograph and may range from recent weathering of ancient bedrock to younger sedimentary deposits.

Uses & applications

Primarily a natural pebble or educational specimen; sandstone may be used as building stone, while limestone is used for aggregate, cement, and lime. This example has little jewelry or commercial value.

Geological facts

A steel nail can scratch limestone but usually not quartz-rich sandstone; dilute vinegar may fizz on calcite-rich limestone. The rough surface and rounded shape indicate substantial weathering and transport.

Field identification & locations

Common in riverbeds, beaches, gravel deposits, and sedimentary terrains worldwide. Check a fresh spot for grain visibility, perform a vinegar test, and avoid relying on color alone for identification.