sedimentary

Iron-stained rock, likely limonite-rich weathered stone

Limonite (iron oxyhydroxides, chiefly goethite) coating or staining a rock of uncertain composition

AI-generated identification · may be incorrect

Ochre-brown, earthy to dull luster, irregular fracture; hardness varies with the host rock, while limonite is typically about 4–5.5 Mohs. The image is too limited to determine crystal structure or host-rock composition reliably.

Identified October 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Iron-bearing minerals oxidized during weathering, depositing brown iron oxyhydroxides on the rock; this can occur in many geological settings and ages.

Uses & applications

Iron oxides are used as pigments and ores; this specimen appears more suitable for general collecting than industrial use.

Geological facts

Limonite is a field term for mixtures of hydrated iron oxides rather than one distinct mineral species.

Field identification & locations

The rusty ochre patch suggests iron-oxide staining, but the host cannot be identified confidently from the photo. Look for earthy texture and reddish-brown streak; commonly found in weathered outcrops and soils worldwide.