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Akaganeite

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Akaganéite
Akaganeite is an iron(III) oxide-hydroxide / chloride mineral with formula: Fe3+O(OH,Cl) e.g.; ß-FeO(OH). It is formed by the weathering of pyrrhotite (Fe1-xS). Nickel also has been reported in the structure. It has a monoclinic crystal structure, a metallic luster and a brownish yellow streak. It is named after the Akagane mine in IwateJapan, in which it was discovered. It has also been found in widely dispersed locations around the world and in rocks from the Moon that were brought back during the Apollo Project. The occurrences in meteorites and the lunar sample are thought to have been produced by interaction with Earth's atmosphere.

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Mineralogy Database Dictionary

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Akaganeite

General Information:
 Chemical Formula:
Fe+++(O,OH,Cl)
 IMA Status:
Approved IMA 1962
 Locality:
TL: Japan, Iwate Prefecture, Akagane mn
Physical Properties:
 Color:
brown or rusty brown.
 Density:
3
 Diaphaniety:
Opaque
 Luster:
Adamantine - Metallic
 Streak:
brownish yellow
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