mineral
Ironstone with possible iron-oxide staining
Iron-rich limonite/goethite; exact identification requires testing
AI-generated identification · may be incorrectOchre-yellow to dark brown, earthy to resinous luster, irregular fracture, and no obvious cleavage. Goethite has Mohs hardness about 5–5.5; limonite is a variable mixture of hydrated iron oxides.
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Physical properties
Ochre-yellow to dark brown, earthy to resinous luster, irregular fracture, and no obvious cleavage. Goethite has Mohs hardness about 5–5.5; limonite is a variable mixture of hydrated iron oxides.
Formation & geological history
Forms through oxidation and weathering of iron-bearing minerals, often as coatings, veins, or nodules in soils and rocks. These processes occur across many geological ages.
Uses & applications
Iron oxides are important iron ores and pigments; small rough pieces are chiefly collected as mineral specimens.
Geological facts
The yellow-brown surface is consistent with iron-oxide minerals, but color alone cannot distinguish goethite, limonite, or other iron-rich material.
Field identification & locations
Look for a yellow-brown streak and high density; a streak test and hardness check can help distinguish iron oxides. They occur worldwide in weathered deposits and iron-rich formations.
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