mineral

Iron-rich, oxidized rock (likely limonite/goethite-bearing)

Goethite (α-FeO(OH)) and/or limonite, a mixture of hydrated iron oxides

AI-generated identification · may be incorrect

Rough, earthy texture with rusty yellow-orange to brown coloring and dull to slightly shiny patches. Goethite hardness is about 5–5.5 Mohs; limonite is typically softer and non-crystalline or fine-grained. Exact composition cannot be confirmed from the photo.

Identified October 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms as iron-bearing minerals weather and oxidize near Earth’s surface, commonly in soils, iron deposits, and weathering zones; age varies with the host deposit.

Uses & applications

Iron oxides are used as iron ore and natural pigments; small rough specimens are mainly collected for display.

Geological facts

Yellow-brown streak and rusty coloration are common clues to goethite/limonite, though other iron-rich minerals can look similar.

Field identification & locations

A hand sample with earthy orange-brown color and iron-oxide coatings is suggestive; a streak test and hardness test help distinguish it. Found widely in weathered iron-rich rocks and soils.