sedimentary

Rounded brown river pebble

Likely weathered sandstone or iron-stained quartz-rich rock; exact identification requires testing

AI-generated identification · may be incorrect

Fine-grained, dull earthy brown surface with rounded edges from abrasion; likely Mohs hardness 5–7, no visible cleavage, and low-to-moderate specific gravity. The darkening may result from iron-oxide staining or weathering.

Identified August 27, 2026More sedimentary →

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At a glance

Common name: Rounded brown river pebble
Scientific name: Likely weathered sandstone or iron-stained quartz-rich rock; exact identification requires testing
Category: sedimentary
Identified: August 27, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an ordinary pebble; approximately $5–$20 if unusually attractive, locally significant, 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

Probably formed as a sedimentary rock from compacted sand, then transported and rounded by stream or shoreline abrasion; its precise geological age and source cannot be determined from the image.

Uses & applications

Usually collected as a natural specimen or used decoratively in landscaping; no significant jewelry or industrial value unless testing reveals an unusual material.

Geological facts

The smooth, subrounded shape indicates prolonged mechanical wear, while the uniform texture suggests sandstone, quartzite, or a fine-grained volcanic rock rather than a crystal-rich mineral.

Field identification & locations

Check for gritty grains and weak acid reaction to distinguish sandstone from carbonate rock; a glass-scratch test, streak, and fresh broken surface are useful. Common in river gravels and beaches worldwide.