sedimentary

Rounded river pebble, likely weathered sandstone or iron-rich sedimentary rock

Indeterminate siliciclastic sediment; possibly ferruginous quartz sandstone

AI-generated identification · may be incorrect

Brown to ochre, dull to weakly earthy luster, fine-grained and smoothly water-worn, with small pits and probable iron-oxide staining. Estimated hardness 5–7 Mohs depending on cement; no visible crystals or cleavage.

Identified September 22, 2026More sedimentary →

Explore Rounded river pebble, likely weathered sandstone or iron-rich sedimentary rock in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Rounded river pebble, likely weathered sandstone or iron-rich sedimentary rock
Scientific name: Indeterminate siliciclastic sediment; possibly ferruginous quartz sandstone
Category: sedimentary
Identified: September 22, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an ordinary pebble; about $5–$20 if unusually attractive, locality-specific, or sold as a curated 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

Formation & geological history

Likely formed from compacted quartz-rich sand cemented by silica or iron oxides, then rounded by stream or beach abrasion. Its depositional age cannot be determined from the photograph.

Uses & applications

Primarily a natural collectible or decorative pebble; comparable material may be used as aggregate, landscaping stone, or ornamental stone, but this individual has little commercial utility.

Geological facts

The rounded shape and battered surface indicate prolonged transport in moving water or surf. The orange-brown color commonly reflects hematite or limonite coatings and cement.

Field identification & locations

Test hardness against glass, inspect a fresh scratch, and apply dilute hydrochloric acid: sandstone usually does not fizz unless carbonate cement is present. Common in riverbeds, beaches, and gravel deposits worldwide.