sedimentary

Weathered iron-rich rock, likely laterite or ironstone

Ferruginous laterite/ironstone, composed mainly of goethite (FeO(OH)), hematite (Fe₂O₃), and clay minerals

AI-generated identification · may be incorrect

Brown to reddish-brown, earthy to dull submetallic luster, fine-grained and massive with irregular fracture; typically Mohs hardness 4–6 and specific gravity about 2.5–4.3. The image does not show diagnostic crystals, so exact identification is uncertain.

Identified August 11, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich rock, likely laterite or ironstone
Scientific name: Ferruginous laterite/ironstone, composed mainly of goethite (FeO(OH)), hematite (Fe₂O₃), and clay minerals
Category: sedimentary
Identified: August 11, 2026
Method: Standard

AI Estimated Value

Usually $5–$25 for a small common specimen; unusual botryoidal or strongly mineralized pieces may sell for $30–$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

Forms by intense tropical or subtropical chemical weathering, which leaches silica and concentrates iron oxides; commonly develops as residual soil horizons or cemented ironstone. It may range from relatively young weathering crust to ancient lateritic deposits.

Uses & applications

Used as iron ore when sufficiently iron-rich, aggregate, road material, pigment, and occasionally decorative stone; generally not a jewelry material.

Geological facts

Its rusty color comes from oxidized iron minerals, and some specimens are weakly magnetic if magnetite is present. A red-brown streak and lack of visible cleavage are typical.

Field identification & locations

Common in tropical regions, including India, Africa, Australia, Brazil, and parts of the southeastern United States. Test with a streak plate, magnet, and dilute hydrochloric acid; a definitive ID requires density, streak, and possibly laboratory analysis.