sedimentary

Iron-oxide-stained rock, possibly limonite-rich laterite

Limonite (hydrated iron oxides, commonly goethite); exact host rock cannot be determined from the image

AI-generated identification · may be incorrect

Ochre-yellow to rusty brown, earthy and irregular with dark inclusions; likely low luster and opaque. Limonite has variable hardness, roughly 1–5.5 Mohs, and no single crystal structure because it is a mixture.

Identified October 14, 2026More sedimentary →

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At a glance

Common name: Iron-oxide-stained rock, possibly limonite-rich laterite
Scientific name: Limonite (hydrated iron oxides, commonly goethite); exact host rock cannot be determined from the image
Category: sedimentary
Identified: October 14, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small, common rough specimen; higher-quality or unusually formed pieces may bring more.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Iron-bearing minerals weather and oxidize near Earth’s surface, concentrating hydrated iron oxides in soils or lateritic deposits. Such deposits form in many climates and ages; the specimen’s age and precise origin are not identifiable from appearance alone.

Uses & applications

Iron oxides are used as pigments and, in suitable concentrated deposits, as iron ore; earthy specimens are also collected or used for mineral display.

Geological facts

“Limonite” is a field term for mixtures of hydrated iron oxides rather than one mineral species. Its yellow-brown color commonly comes from goethite and related compounds.

Field identification & locations

Look for ochre staining, earthy texture, and a yellow-brown streak; a streak test and hardness test can help distinguish it from other rocks. Common in weathered iron-rich soils and ore deposits worldwide.