mineral

Weathered iron-rich rock fragment

Likely limonite/goethite with hematite and iron-bearing silicates; exact identification requires testing

AI-generated identification · may be incorrect

Rusty yellow-brown, reddish, gray, and black colors with an earthy to dull luster and irregular fracture; likely Mohs hardness about 4–6 and relatively high specific gravity. The image does not show diagnostic crystal structure or cleavage.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Probably formed by oxidation and weathering of an iron-bearing sulfide or mafic rock, producing goethite/limonite and hematite; age cannot be determined visually. It may also be an iron-rich rock fragment from a lateritic or hydrothermal environment.

Uses & applications

Common material is used as iron ore, natural pigment, and a collector specimen; this small rough fragment has little industrial or jewelry value.

Geological facts

Iron oxides commonly produce the red, orange, yellow, and brown coloration seen in weathered rocks. A streak test and magnetism test would help distinguish iron minerals.

Field identification & locations

Identify with a reddish-yellow to brown streak, moderate-to-high density, and possible weak magnetism; avoid assuming meteorite or ore origin without laboratory testing. Common in weathered soils, mine dumps, and iron-rich outcrops worldwide.