mineral

Weathered iron-rich rock, possibly limonite-bearing sandstone or altered volcanic rock

Limonite/goethite mixture; exact host rock is indeterminate from the image

AI-generated identification · may be incorrect

Brown-yellow, earthy to dull luster, irregular massive texture, and no visible crystal faces or cleavage. Likely Mohs hardness about 4–5.5, with moderate-to-high density; a yellow-brown streak and reddish-brown powder would support iron oxides.

Identified August 16, 2026More mineral →

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At a glance

Common name: Weathered iron-rich rock, possibly limonite-bearing sandstone or altered volcanic rock
Scientific name: Limonite/goethite mixture; exact host rock is indeterminate from the image
Category: mineral
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a common hand specimen; up to roughly $20–$50 if unusually aesthetic or locality-labeled.

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

Formed by oxidation and weathering of iron-bearing minerals near Earth’s surface, commonly producing limonite and goethite coatings or replacements. Such material can form from the Cenozoic to much older rocks and commonly accumulates in soils, weathering zones, and hydrothermal deposits.

Uses & applications

Used historically as an iron ore and natural yellow-brown pigment; attractive specimens may be collected, but this example appears common and non-gem quality.

Geological facts

Limonite is not a single true mineral but a variable mixture of hydrated iron oxides, often dominated by goethite. Its color can range from yellow ochre to dark brown or nearly black.

Field identification & locations

Common in weathered iron-rich rocks worldwide, including lateritic soils and oxidized ore zones. Test streak on unglazed porcelain, magnetism, and acid reaction; avoid damaging the specimen without permission.