sedimentary

Iron-rich breccia or gossan rock

Goethite–hematite–limonite aggregate, possibly with chalcopyrite/malachite staining

AI-generated identification · may be incorrect

Hardness roughly 4–6.5 Mohs; dark brown to black with rusty orange, yellow, and metallic-looking patches, earthy to submetallic luster, and irregular massive texture without visible crystal cleavage. The bright colors commonly reflect iron oxides and weathered sulfides.

Identified September 6, 2026More sedimentary →

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At a glance

Common name: Iron-rich breccia or gossan rock
Scientific name: Goethite–hematite–limonite aggregate, possibly with chalcopyrite/malachite staining
Category: sedimentary
Identified: September 6, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common hand specimen; $30–$100+ if unusually colorful, heavy, or confirmed to contain attractive copper or gold mineralization.

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

Likely a weathering-zone or hydrothermal ore specimen formed by oxidation of iron- and sulfide-rich minerals near Earth’s surface; exact age and source cannot be determined from the photograph. It may represent a gossan, ironstone, or mineralized breccia rather than a single rock species.

Uses & applications

Used mainly as a collector specimen, lapidary material, or occasionally as an iron/copper ore indicator; it is generally unsuitable for structural construction. Attractive polished pieces may be used decoratively.

Geological facts

Gossans are rusty oxidation caps above sulfide ore deposits and can preserve vivid red, orange, yellow, and black mineral zoning. Yellow metallic areas may be iron sulfides, while green-blue staining—if present—could indicate copper minerals.

Field identification & locations

Look for a heavy specimen, rusty streak, variable magnetism, and possible fizz-free reaction to dilute acid; a streak test and hardness test help distinguish hematite, goethite, and sulfides. Common in oxidized mining districts worldwide.