sedimentary

Rounded iron-rich pebble, likely lateritic sandstone or ferruginous conglomerate fragment

Hematite/goethite-bearing ferruginous sediment; exact identification requires testing

AI-generated identification · may be incorrect

Earthy reddish-brown color, dull to weakly silky luster, fine-grained and rounded by abrasion; estimated Mohs hardness 3–6, with no visible cleavage or crystals. Iron oxides may produce a red-brown streak and moderate-to-high density.

Identified August 26, 2026More sedimentary →

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At a glance

Common name: Rounded iron-rich pebble, likely lateritic sandstone or ferruginous conglomerate fragment
Scientific name: Hematite/goethite-bearing ferruginous sediment; exact identification requires testing
Category: sedimentary
Identified: August 26, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an ordinary pebble; up to about $10–$30 if unusually dense, magnetic, or locality-labeled.

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 when iron-bearing minerals weathered and cemented sediment, commonly in tropical laterite or ironstone environments, then became rounded in stream or beach transport. Its precise geological age cannot be determined from the photograph.

Uses & applications

Usually a common field specimen with little commercial value; iron-rich sedimentary material can be mined as iron ore when sufficiently concentrated, while attractive pieces may be used in teaching or collections.

Geological facts

The rusty coloration mainly reflects hematite, goethite, or limonite coatings and cement. Surface pits and smooth edges suggest natural weathering and transport rather than a crystalline mineral specimen.

Field identification & locations

Check for a reddish-yellow streak on unglazed ceramic, magnetic response, density, and hardness; a strong streak or magnetism supports iron-rich material. Common in lateritic soils, stream gravels, and ironstone regions worldwide.