mineral

Dark brown mineral fragments, possibly garnet or iron-rich rock

Indeterminate from image; possible almandine garnet (Fe₃Al₂Si₃O₁₂) or limonite-rich material

AI-generated identification · may be incorrect

Small, dark reddish-brown, opaque fragments with a dull to subtly vitreous luster and irregular fracture. Hardness is estimated around 6–7 for garnet, but the image does not permit reliable testing of hardness, cleavage, or specific gravity.

Identified August 20, 2026More mineral →

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At a glance

Common name: Dark brown mineral fragments, possibly garnet or iron-rich rock
Scientific name: Indeterminate from image; possible almandine garnet (Fe₃Al₂Si₃O₁₂) or limonite-rich material
Category: mineral
Identified: August 20, 2026
Method: Standard

AI Estimated Value

$1–$10 for unidentified fragments; approximately $5–$50 for small confirmed garnet specimens, depending on quality.

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

If garnet, it likely formed during regional or contact metamorphism of aluminous rocks; if limonite-rich, it formed through weathering and oxidation of iron-bearing minerals. Geological age and exact origin cannot be determined visually.

Uses & applications

Garnet is used as an abrasive and gemstone; iron-rich fragments have limited commercial use and are mainly of collecting interest.

Geological facts

Garnet commonly lacks cleavage and breaks along uneven surfaces, while limonite is softer and usually earthy. The fragments may also be ordinary dark rock, so laboratory testing is needed for confident identification.

Field identification & locations

Test with a steel knife, streak plate, magnet, and loupe; garnet should resist scratching and typically leaves little or no streak. Common garnet sources include India, Madagascar, Sri Lanka, the United States, and Africa.