mineral

Weathered iron-rich rock, likely limonite/goethite-bearing laterite

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

AI-generated identification · may be incorrect

Brown to ochre, earthy to dull luster, irregular massive texture, and no visible cleavage; hardness is approximately 4–5.5 Mohs, with typically moderate-to-high specific gravity from abundant iron oxides.

Identified August 12, 2026More mineral →

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At a glance

Common name: Weathered iron-rich rock, likely limonite/goethite-bearing laterite
Scientific name: Limonite–goethite aggregate, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)
Category: mineral
Identified: August 12, 2026
Method: Standard

AI Estimated Value

Typically $2–$15 for common hand specimens; attractive botryoidal or well-crystallized goethite specimens may sell for $25–$200+.

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 intense chemical weathering and oxidation of iron-bearing minerals, producing laterite, gossan, or weathered ironstone. It is generally geologically young relative to its parent rock, though the source rock may be much older.

Uses & applications

Used as an iron ore or natural earth pigment when sufficiently pure; ordinary specimens have little industrial or jewelry use.

Geological facts

The yellow-brown streak and rusty appearance are characteristic of hydrated iron oxides. Limonite is a field and commercial term rather than a single precisely defined mineral species.

Field identification & locations

Common in tropical and subtropical soils, oxidized ore zones, and weathered outcrops worldwide. A yellow-brown streak, earthy texture, high apparent density, and possible attraction to a strong magnet help distinguish it from ordinary soil or sandstone.