mineral

Likely iron-rich laterite or limonite/goethite nodule

Hydrated iron oxides, chiefly limonite (FeO(OH)·nH₂O) and/or goethite (FeO(OH))

AI-generated identification · may be incorrect

Dark brown, earthy to submetallic, irregular rounded nodules with a rough surface. Typical hardness is about 4–5.5 Mohs, streak yellow-brown to reddish-brown, and specific gravity roughly 3.3–4.3. The wet photo limits certainty; crystal structure cannot be confirmed visually.

Identified August 22, 2026More mineral →

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At a glance

Common name: Likely iron-rich laterite or limonite/goethite nodule
Scientific name: Hydrated iron oxides, chiefly limonite (FeO(OH)·nH₂O) and/or goethite (FeO(OH))
Category: mineral
Identified: August 22, 2026
Method: Standard

AI Estimated Value

About $0–$5 for ordinary loose nodules; perhaps $5–$20 if unusually shaped or part of a labeled collection. A precise price requires size, weight, provenance, streak, magnetism, and chemical testing.

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

Forms by intense tropical weathering and concentration of iron in lateritic soils, commonly over weathered basalt or other iron-bearing rocks. The reported Andhra Pradesh location is geologically plausible for lateritic iron nodules.

Uses & applications

Used historically as iron ore or natural pigment; small pieces have little industrial value and are mainly educational or collector specimens.

Geological facts

Magnetism varies: goethite/limonite is usually weakly magnetic, while associated magnetite can be strongly magnetic. A yellow-brown streak and reddish-brown powder are useful clues.

Field identification & locations

Likely common rather than a valuable gemstone. Test an inconspicuous edge for streak on unglazed porcelain and check magnetism; avoid relying on appearance alone because polished slag and iron-rich industrial waste can look similar.