mineral

Likely small iron-rich concretion or weathered mineral fragment

Indeterminate; possibly limonite/goethite-bearing material with quartz or feldspar

AI-generated identification · may be incorrect

The larger specimen is brown, granular, and irregular, with a dull earthy luster; the smaller yellow-brown piece may be iron oxide or weathered feldspar. Hardness, cleavage, crystal structure, and specific gravity cannot be determined reliably from the photograph.

Identified August 26, 2026More mineral →

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At a glance

Common name: Likely small iron-rich concretion or weathered mineral fragment
Scientific name: Indeterminate; possibly limonite/goethite-bearing material with quartz or feldspar
Category: mineral
Identified: August 26, 2026
Method: Standard

AI Estimated Value

Typically $0-$5 for common unidentified pieces; under $20 if testing reveals an attractive or locality-specific 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 weathering and oxidation of iron-bearing rock, or as a small sedimentary concretion; age and exact geological setting are unknown.

Uses & applications

No significant industrial or jewelry use is likely at this size; it may have modest interest as a field-collected specimen.

Geological facts

Brown-yellow colors commonly indicate hydrated iron oxides such as limonite or goethite, but the image does not show diagnostic crystal form or texture.

Field identification & locations

Test streak on unglazed porcelain: limonite/goethite usually gives a yellow-brown streak. A magnet test, hardness test, and close examination of fresh surfaces would help distinguish iron oxide from rusty rock, sandstone, or a mineral fragment.