sedimentary

Rounded brown pebble, likely sandstone or weathered iron-rich rock

Indeterminate; possibly ferruginous sandstone (quartz-rich sedimentary rock)

AI-generated identification · may be incorrect

Hardness approximately 5–7 Mohs if sandstone; dull to earthy luster, tan-brown color, rounded and water-worn surface. Visible texture is insufficient to confirm grain size or mineral composition.

Identified August 28, 2026More sedimentary →

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At a glance

Common name: Rounded brown pebble, likely sandstone or weathered iron-rich rock
Scientific name: Indeterminate; possibly ferruginous sandstone (quartz-rich sedimentary rock)
Category: sedimentary
Identified: August 28, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an ordinary pebble; approximately $5–$20 if unusually attractive, polished, or tied to a documented locality.

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

Hardness approximately 5–7 Mohs if sandstone; dull to earthy luster, tan-brown color, rounded and water-worn surface. Visible texture is insufficient to confirm grain size or mineral composition.

Formation & geological history

Likely formed from cemented sand grains, with iron-oxide staining producing the brown color, then rounded by stream or shoreline abrasion. Its geological age and source cannot be determined from the photograph.

Uses & applications

Primarily a natural specimen or decorative pebble; ordinary material has negligible industrial, construction, or jewelry use unless unusually attractive or confirmed as a rarer rock.

Geological facts

The rounded shape indicates transport and abrasion, while the rusty coloration commonly reflects hematite or goethite coatings. A fresh broken surface would be more diagnostic than the weathered exterior.

Field identification & locations

Commonly found in river gravels, beaches, and glacial deposits. Test for visible quartz grains, layering, acid reaction, and streak; a hand lens and hardness test can distinguish sandstone from chert, basalt, or ironstone.