mineral

Weathered iron-rich stone, possibly limonite-bearing rock

Limonite/goethite-rich material; composition commonly approximated as hydrated iron oxides, FeO(OH)·nH₂O

AI-generated identification · may be incorrect

Brown-gold to rusty coloration, earthy to dull metallic luster, irregular massive texture, and no obvious crystal faces or cleavage. Typical hardness is about 4–5.5 Mohs; specific gravity commonly 3.0–4.3, but the photograph alone cannot confirm the exact mineral or density.

Identified September 6, 2026More mineral →

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At a glance

Common name: Weathered iron-rich stone, possibly limonite-bearing rock
Scientific name: Limonite/goethite-rich material; composition commonly approximated as hydrated iron oxides, FeO(OH)·nH₂O
Category: mineral
Identified: September 6, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for an ordinary hand specimen; approximately $10–$50 or more for attractive, locality-labeled specimens.

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 through oxidation and weathering of iron-bearing minerals, commonly producing gossan, ironstone, or weathered ore; ages range from recent weathering products to ancient deposits. It may also be a weathered fragment of another iron-rich rock.

Uses & applications

Used historically as an iron ore and natural yellow-brown pigment; attractive specimens may be collected, though this appearance is generally low-value unless associated with notable minerals or a recognized locality.

Geological facts

Limonite is not a single crystal mineral but a variable mixture of hydrated iron oxides, chiefly goethite. A yellow streak, strong response to a magnet if magnetite is present, and appreciable heft help distinguish iron-rich material.

Field identification & locations

Common in oxidized ore zones worldwide, including Australia, Brazil, India, and the United States. A streak test on unglazed porcelain, hardness testing, magnetism, and specific-gravity measurement are useful; exact identification requires testing or analysis.