mineral

Iron-oxide-stained rock (likely limonite/goethite-rich material)

Goethite (α-FeO(OH)) and/or limonite, an iron-oxide/hydroxide mixture coating a rock matrix

AI-generated identification · may be incorrect

Rough, earthy surface with rusty red, orange, and brown staining; likely opaque with dull to earthy luster. Goethite is Mohs 5–5.5; limonite mixtures vary, and the specimen’s crystal structure and hardness cannot be confirmed from the image.

Identified October 13, 2026More mineral →

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At a glance

Common name: Iron-oxide-stained rock (likely limonite/goethite-rich material)
Scientific name: Goethite (α-FeO(OH)) and/or limonite, an iron-oxide/hydroxide mixture coating a rock matrix
Category: mineral
Identified: October 13, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common small rough specimen; higher value would require an unusual locality or confirmed mineral features.

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

Forms as iron-bearing minerals weather and oxidize near Earth’s surface, commonly in soils, weathered rock, and iron-rich deposits; age is undetermined from appearance alone.

Uses & applications

Iron oxides are used as pigments and iron ores; this small rough specimen is mainly suitable for collecting or display.

Geological facts

Rust-red and yellow-brown colors commonly result from iron oxidation; the visible color alone cannot distinguish goethite from hematite or other iron-rich minerals.

Field identification & locations

The hand-sized specimen has an irregular, rusty exterior and appears to contain iron-rich material, but identification would require tests or close inspection. Iron oxides are widespread worldwide in weathered rocks and soils.