mineral

Iron-rich botryoidal limonite/goethite specimen

Limonite (amorphous hydrated iron oxides, chiefly goethite, α-FeO(OH))

AI-generated identification · may be incorrect

Rust-orange to brown, earthy to submetallic luster, with rounded botryoidal surfaces and gray quartz-like or harder iron-oxide patches. Hardness is roughly 4–5.5 Mohs, variable; no distinct cleavage, and specific gravity commonly about 3.3–4.3.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms by oxidation and weathering of iron-bearing minerals, commonly as cavity coatings, replacement masses, or gossan above sulfide deposits. It is generally geologically young relative to its host rock and may form continuously at near-surface conditions.

Uses & applications

Used historically as an iron ore and natural yellow-brown pigment; attractive botryoidal pieces are collected as mineral specimens, though they have little gemstone value.

Geological facts

“Limonite” is a field and commercial term rather than a single precisely defined mineral. The rounded texture reflects precipitation of iron oxyhydroxides in openings or along weathering surfaces.

Field identification & locations

Identify it by its rusty orange-brown color, earthy streak, heavy feel, and botryoidal texture; a reddish-brown to yellow streak and lack of fizz help distinguish it from many carbonates. Common in weathered iron deposits, mine gossans, and oxidized zones worldwide.