mineral

Iron-rich stone, likely limonite/goethite-bearing rock

Limonite (hydrated iron oxides; chiefly goethite, FeO(OH), with possible hematite)

AI-generated identification · may be incorrect

Brown to reddish-brown, earthy-to-submetallic luster, irregular granular texture, and no visible cleavage; hardness typically 4–5.5 Mohs, with a yellow-brown streak and relatively high specific gravity (~3–4).

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms through weathering and oxidation of iron-bearing minerals, commonly as a soil or rock coating, lateritic mass, or gossan; it may range from young surface material to ancient weathering deposits.

Uses & applications

Used historically as an iron ore and natural ochre pigment; ordinary specimens have limited commercial value, while attractive botryoidal goethite pieces may be collectible.

Geological facts

The image cannot establish an exact species: the specimen could also be iron-stained chert, weathered sulfide ore, or limonite-rich rock.

Field identification & locations

Common near weathered iron deposits worldwide; identify with its rusty color, heavy feel, yellow-brown streak, and attraction to a strong magnet only if magnetite is present. A streak test and hardness test are more reliable than appearance alone.