mineral

Iron-rich rock or weathered metallic mineral specimen

Uncertain; possibly limonite/goethite with iron oxides, or a metallic sulfide such as pyrite/chalcopyrite

AI-generated identification · may be incorrect

Brown to dark metallic, irregular and heavily weathered; likely opaque with earthy-to-submetallic luster. Hardness may range from about 4–6.5 Mohs depending on composition; crystal structure and cleavage are not identifiable from the image.

Identified August 14, 2026More mineral →

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At a glance

Common name: Iron-rich rock or weathered metallic mineral specimen
Scientific name: Uncertain; possibly limonite/goethite with iron oxides, or a metallic sulfide such as pyrite/chalcopyrite
Category: mineral
Identified: August 14, 2026
Method: Standard

AI Estimated Value

About $1–$15 for a common small specimen; $20–$75 if unusual, well-crystallized, or confirmed as a significant ore mineral.

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 formed by oxidation and weathering of an iron-bearing mineral or sulfide deposit near Earth’s surface; age cannot be determined visually. Common in hydrothermal veins, gossans, and sedimentary iron-rich zones.

Uses & applications

Iron oxides are used as pigments and iron ore; sulfides are mined for iron, copper, or sulfur. Attractive pieces may have modest educational or collector value.

Geological facts

The rusty brown color commonly indicates hydrated iron oxides such as limonite or goethite. A streak test, magnet test, hardness test, and fresh fracture would greatly improve identification.

Field identification & locations

Commonly found in weathered ore zones worldwide, including iron-rich soils and mine dumps. Test streak on unglazed porcelain, magnetism, and density; avoid assuming pyrite without visible cubic crystals or a diagnostic pale-brass color.