mineral
Weathered iron-rich rock fragment
Likely limonite/goethite with hematite and iron-bearing silicates; exact identification requires testing
AI-generated identification · may be incorrectRusty 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.
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Physical properties
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.
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.
