mineral

Weathered iron-rich rock fragment

Likely limonite/goethite-bearing material; exact identification requires testing

AI-generated identification · may be incorrect

Yellow-brown, earthy to dull luster, irregular granular texture, and no visible crystal form; hardness commonly about 4–5.5 Mohs, with streak often yellow-brown to reddish-brown and relatively high specific gravity.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Probably formed by oxidation and weathering of iron-bearing minerals, producing hydrated iron oxides such as limonite and goethite; its precise age and parent rock are indeterminate from the image.

Uses & applications

Used as an iron ore or natural pigment when sufficiently pure; small specimens are mainly valued for collecting and educational display.

Geological facts

The term limonite describes a mixture of hydrated iron oxides rather than a single mineral. Goethite commonly produces the brown, ochre, and yellow coloration seen in weathered iron deposits.

Field identification & locations

Identify with a yellow-brown streak, rust-colored powder, moderate heft, and lack of acid reaction; common in soils, gossans, bog-iron deposits, and weathered ore zones worldwide.