mineral

Weathered iron-rich rock, possibly limonite/goethite

Limonite (hydrated iron oxides; commonly goethite, FeO(OH), mixed with hematite)

AI-generated identification · may be incorrect

Brown to dark brown, earthy-to-submetallic luster, irregular massive texture, and no visible crystal faces or cleavage; hardness approximately 4–5.5 Mohs, with relatively high specific gravity (~3–4.3).

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms through weathering and oxidation of iron-bearing minerals, often as a soil or fracture filling; typically geologically young compared with its parent rock and common in oxidized ore zones.

Uses & applications

Used historically as an iron ore and earth pigment; small specimens are mainly educational or collectible rather than gem-quality.

Geological facts

Limonite is a field term rather than a single precisely defined mineral, and its color comes from hydrated iron oxides.

Field identification & locations

Common in iron-rich soils, gossans, bog deposits, and weathered sulfide ores worldwide. A yellow-brown streak, rusty staining, and attraction to a magnet if hematite/magnetite is present help identify it; the image is insufficient for certainty.