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A hydrous iron oxide, α-FeO(OH), which forms a series with lepidocrocite, ˠ-FeO(OH); sp. gr. 4.0; hardness 5; reddish-brown; massive or earthy; occurs as an alteration product of iron-bearing minerals in association with limonite or hematite. It is named after J. W. von Goethe (1749–1832).

Subjects: Earth Sciences and Geography — Chemistry.

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