mineral

Weathered iron-rich rock fragment

Likely limonite/goethite-bearing ferruginous rock; exact identification requires testing

AI-generated identification · may be incorrect

Brown-orange, earthy to dull luster with a dark gray, apparently fine-grained interior; likely Mohs hardness about 4–6, no visible crystals or cleavage, and moderate-to-high density from iron oxides.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed by weathering and oxidation of an iron-bearing parent rock or ore, producing limonite/goethite coatings and replacement. Its geological age cannot be determined from the photograph.

Uses & applications

Common iron-oxide material has limited commercial value as iron ore, pigment, or a teaching/collecting specimen; this fragment is not suitable for jewelry or construction identification.

Geological facts

The orange-brown coloration is characteristic of hydrated iron oxides, while the dark interior may represent unoxidized host rock. Surface rust staining can also occur on industrial debris, so geological origin is not certain from the image alone.

Field identification & locations

Look for a rusty streak, high density, and attraction to a magnet if magnetite is present; a streak test, hardness test, and acid test would help distinguish it from slag or asphalt debris. Iron-rich rocks occur worldwide, especially in laterites, weathering zones, and banded iron formations.