sedimentary

Iron-oxide-stained rock, likely limonite/goethite-bearing stone

Limonite (a mixture of hydrated iron oxides, commonly including goethite, FeO(OH)) coating or staining a host rock

AI-generated identification · may be incorrect

Rusty ochre-brown, earthy to dull luster, irregular massive texture; hardness varies with the host, while goethite is about 5–5.5 Mohs. The image does not show enough detail to identify the host rock or crystal structure.

Identified October 3, 2026More sedimentary →

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At a glance

Common name: Iron-oxide-stained rock, likely limonite/goethite-bearing stone
Scientific name: Limonite (a mixture of hydrated iron oxides, commonly including goethite, FeO(OH)) coating or staining a host rock
Category: sedimentary
Identified: October 3, 2026
Method: Standard

AI Estimated Value

About $1–$20 for a small, common specimen; higher value would require distinctive features or verified mineral identity.

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-rich water can oxidize and deposit hydrated iron oxides in fractures, cavities, or on rock surfaces; deposits form in many geological settings and ages.

Uses & applications

Iron-oxide material has historically served as iron ore and natural pigment; this specimen appears mainly of educational or collecting interest.

Geological facts

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

Field identification & locations

The orange-brown coating suggests iron oxidation, but a closer view and tests are needed to distinguish goethite/limonite from other iron-stained material and identify the host. Common in weathered rocks, soils, and iron-rich deposits worldwide.