mineral

Likely weathered iron-rich rock (possible limonite/goethite-bearing stone)

Limonite–goethite mixture, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)

AI-generated identification · may be incorrect

Brown to dark brown, earthy and dull to weakly metallic, with an irregular granular surface; typical hardness is about 4–5.5 Mohs and specific gravity about 3.3–4.3. The image is insufficient to determine crystal structure or cleavage reliably.

Identified August 14, 2026More mineral →

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At a glance

Common name: Likely weathered iron-rich rock (possible limonite/goethite-bearing stone)
Scientific name: Limonite–goethite mixture, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)
Category: mineral
Identified: August 14, 2026
Method: Standard

AI Estimated Value

Usually $1–$10 for a common hand specimen; roughly $15–$75 for unusually botryoidal, colorful, or 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, often as a soil concretion, gossan, or coating around a parent rock. Formation may occur at or near Earth’s surface over relatively recent geological timescales.

Uses & applications

Used historically as an iron ore and natural yellow-brown pigment; ordinary pieces have little industrial or jewelry value, though attractive botryoidal specimens may be collected.

Geological facts

Limonite is not a single well-defined mineral but a variable mixture of hydrated iron oxides; goethite is one of its principal components.

Field identification & locations

Common in weathered soils, iron-rich outcrops, and abandoned mine areas. A yellow-brown streak on unglazed porcelain, high density, and attraction to a strong magnet can support identification, though magnetism varies; a fresh broken surface would improve confidence.