sedimentary

Weathered iron-rich stone, possibly limonite-bearing sandstone or laterite

Goethite–hematite/limonite mixture; exact identification requires testing

AI-generated identification · may be incorrect

Hardness approximately 4–6 Mohs; mottled yellow-brown, red-brown, and black; earthy to dull luster; fine-grained, massive, and irregular with no visible cleavage. The dark patches may be iron oxides or manganese oxides.

Identified September 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed by intense weathering and oxidation of iron-bearing rock, producing a ferruginous concretion, laterite, or iron-cemented sandstone. Such material commonly forms in oxygen-rich soils and weathering zones over millions of years.

Uses & applications

Usually has little commercial value as an isolated specimen, though iron-rich material can be an ore or used locally as pigment, aggregate, or construction fill. Attractive pieces may interest casual collectors.

Geological facts

Yellow-brown coloration commonly reflects limonite/goethite, while red and black areas may indicate hematite and manganese oxides. The image alone cannot distinguish this from a weathered volcanic or metamorphic fragment.

Field identification & locations

Look for a rusty streak, unusually high density, and possible attraction to a strong magnet if magnetite is present; a ceramic-streak test and hardness test are useful. Common in tropical lateritic terrains, ironstone outcrops, and weathered rock deposits.