sedimentary

Rounded brown pebble, likely weathered sandstone or iron-stained quartzite

Probable quartz-rich sandstone (SiO₂-dominated); exact identification requires testing

AI-generated identification · may be incorrect

Tan-brown, dull to slightly earthy luster, fine-grained and rounded by abrasion; apparent hardness roughly 6–7 if quartz-rich, with no visible cleavage. The surface appears porous or granular, consistent with sandstone rather than a crystal specimen.

Identified August 11, 2026More sedimentary →

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At a glance

Common name: Rounded brown pebble, likely weathered sandstone or iron-stained quartzite
Scientific name: Probable quartz-rich sandstone (SiO₂-dominated); exact identification requires testing
Category: sedimentary
Identified: August 11, 2026
Method: Standard

AI Estimated Value

About $0–$5 as an ordinary pebble; potentially $5–$20 if unusually attractive, locality-specific, or demonstrably rare.

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

Likely formed from compacted and cemented quartz-rich sand, then weathered and rounded in a stream or sedimentary environment; its depositional age cannot be determined from the photograph.

Uses & applications

Suitable mainly as a decorative or educational specimen; ordinary material has no significant industrial or jewelry value, though sandstone is widely used as building and paving stone.

Geological facts

Brown coloration commonly results from iron-oxide coatings or cement. The image does not show diagnostic fossils, layering, crystal faces, or metallic meteorite features.

Field identification & locations

Check for visible sand grains, sedimentary layering, and a scratch resistance near quartz; sandstone may shed grains, while quartzite is dense and typically scratches glass. Common worldwide in sedimentary terrains and stream beds.