sedimentary

Iron-rich brown rock, likely laterite or weathered ironstone

Goethite–hematite-bearing limonite/ironstone; composition commonly FeO(OH), Fe₂O₃, and hydrated iron oxides

AI-generated identification · may be incorrect

Dark reddish-brown, earthy to submetallic luster, irregular fracture, and locally porous texture; approximate Mohs hardness 4–6, with variable density and no consistent crystal habit. The rusty color suggests abundant oxidized iron minerals.

Identified August 22, 2026More sedimentary →

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At a glance

Common name: Iron-rich brown rock, likely laterite or weathered ironstone
Scientific name: Goethite–hematite-bearing limonite/ironstone; composition commonly FeO(OH), Fe₂O₃, and hydrated iron oxides
Category: sedimentary
Identified: August 22, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a common hand specimen; attractive botryoidal or crystalline material may reach $20–$100.

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 by intense chemical weathering and concentration of iron in soil or sediment, producing laterite or ferruginous ironstone; such materials range from Precambrian iron-rich deposits to geologically recent weathering profiles.

Uses & applications

Used as iron ore when sufficiently rich, pigment, aggregate, and landscaping stone; ordinary small specimens generally have little commercial or jewelry value.

Geological facts

Hematite and goethite commonly create red, orange, yellow, and brown coloration. A reddish-brown streak on unglazed porcelain and attraction to a strong magnet, if magnetite is present, are useful tests.

Field identification & locations

Common in tropical weathering zones and iron-rich sedimentary terrains, including Australia, India, Brazil, and Africa. Identification is tentative from the photograph; a streak test, magnet test, and specific-gravity measurement would refine it.