mineral

Iron-oxide-stained rock, likely limonite/goethite-rich material

Likely goethite (α-FeO(OH)) and/or limonite (a mixture of hydrated iron oxides), staining a silicate-rich rock

AI-generated identification · may be incorrect

Rusty orange-brown, earthy to dull luster, irregular fracture, and no obvious crystal faces. Hardness and exact composition cannot be determined from the photo; goethite is typically about 5–5.5 Mohs, while limonite varies.

Identified September 28, 2026More mineral →

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At a glance

Common name: Iron-oxide-stained rock, likely limonite/goethite-rich material
Scientific name: Likely goethite (α-FeO(OH)) and/or limonite (a mixture of hydrated iron oxides), staining a silicate-rich rock
Category: mineral
Identified: September 28, 2026
Method: Standard

AI Estimated Value

About $0–$5 as a common, unidentified rough specimen; value could differ if testing reveals an unusual mineral or ore.

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, leaving hydrated iron oxides that coat or replace the host rock. Such weathering deposits can form at many ages and in varied environments.

Uses & applications

Iron oxides are iron ores and natural pigments; attractive specimens may be collected, but this small rough piece has little commercial value.

Geological facts

The name “limonite” commonly describes a mixture rather than one distinct mineral. The vivid rusty color comes from oxidized iron.

Field identification & locations

Look for rusty streaks or coatings and an earthy appearance; a streak test may produce yellow-brown to reddish-brown powder. Iron-rich weathering products are plausible near Juneau, Alaska, but the photo cannot establish the precise mineral or host rock.