mineral

Weathered iron-rich rock, possibly limonite/goethite-bearing material

Limonite (hydrated iron oxides; commonly mixtures of goethite, hematite, and lepidocrocite)

AI-generated identification · may be incorrect

Brown-golden, earthy to dull luster with irregular granular texture and no obvious cleavage; typically Mohs hardness about 4–5.5 and specific gravity roughly 3.3–4.3. The metallic-looking patches may indicate goethite or hematite, though the photograph cannot confirm the mineral identity.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms through oxidation and weathering of iron-bearing rocks and sulfide minerals, commonly as a soil or ironstone concretion; generally geologically young relative to its parent rock. It may also occur in hydrothermal or bog-iron deposits.

Uses & applications

Used historically as an iron ore and natural yellow-brown pigment; attractive pieces are collected but are rarely used in jewelry. Industrial value depends on iron content and deposit scale.

Geological facts

A yellow-brown streak on unglazed porcelain supports limonite/goethite, while a red-brown streak suggests hematite. Magnetism, streak, hardness, and density tests would improve identification.

Field identification & locations

Common in oxidized ore zones, laterite, soils, and gossans worldwide; likely local weathering material. Estimated value: $1–$10 for an ordinary hand specimen, up to $20–$50 if unusually aesthetic or locality-specific.