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Feroxyhyte is an oxide/hydroxide of iron, δ-Fe3+O(OH). Feroxyhyte crystallizes in the hexagonal system. It forms as brown rounded to concretionary masses. Feroxyhyte is opaque, magnetic, has a yellow streak, and has a relative density of 4.2.[1]

It occurs in manganese-iron nodules on the Atlantic and Pacific Ocean floors. It is also found in the Baltic, White, and Kara Seas.[2] Forms under high pressure conditions and reverts to goethite on exposure to surface conditions.[1] It also occurs as cement and coatings on clasts in poorly drained soils and sediments, formed by the rapid oxidation of iron(II) oxide compounds.[2]

It was first described in 1976 for an occurrence in soils at its type locality: Kolomyya, Ivano-Frankivsk Oblast, Ukraine.[3][2]


1. ^ a b http://webmineral.com/data/Feroxyhyte.shtml Webmineral
2. ^ a b c http://rruff.geo.arizona.edu/doclib/hom/feroxyhyte.pdf Handbook of Mineralogy
3. ^ http://www.mindat.org/min-1484.html Mindat

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