mineral
Iron-rich laterite or limonite/goethite concretion
Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O)
AI-generated identification · may be incorrectEarthy, granular, yellow-brown to orange-brown, with dull to submetallic luster; hardness about 4–5.5 Mohs, no obvious cleavage, and typically massive or botryoidal rather than crystalline. The specimen appears porous and iron-stained, though a photograph cannot confirm composition.
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Physical properties
Earthy, granular, yellow-brown to orange-brown, with dull to submetallic luster; hardness about 4–5.5 Mohs, no obvious cleavage, and typically massive or botryoidal rather than crystalline. The specimen appears porous and iron-stained, though a photograph cannot confirm composition.
Formation & geological history
Forms through intense chemical weathering and oxidation of iron-bearing minerals, commonly in tropical lateritic soils, weathered rock zones, and iron-oxide veins; ages range from recent soil formation to ancient weathering profiles.
Uses & applications
Used as iron ore where sufficiently concentrated, and historically as ochre pigment; ordinary small specimens have little industrial or jewelry use.
Geological facts
Goethite commonly produces yellow-brown streaks, while hematite-rich material is redder and magnetite-rich material may be magnetic. Limonite is a field term for mixed hydrated iron oxides rather than one precisely defined mineral.
Field identification & locations
Look for a yellow, ochre, or brown streak on unglazed porcelain, earthy texture, and possible weak magnetism if magnetite is present; common worldwide, especially in tropical and oxidized ore environments.
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