Akaganeite, also written as the deprecated Akaganéite, is a chloride-containing iron(III) oxide-hydroxide mineral, formed by the weathering of pyrrhotite (Fe1−xS), an iron-deficient sulfide.
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Akaganeite, also written as the deprecated Akaganéite, is a chloride-containing iron(III) oxide-hydroxide mineral, formed by the weathering of pyrrhotite (Fe1−xS), an iron-deficient sulfide.
Akaganeite is often described as the β phase of anhydrous ferric oxyhydroxide , but some chloride (or fluoride) anions are commonly included in the structure, so a more accurate formula is . This formula derives from the more general expression , where x = 1/6 ≃ 0.167. As the anion is doubly negatively charged, to maintain the electroneutrality in the crystal lattice, the electrical charge deficit (2x) in must be compensated by two monovalent anions, one and one . Nickel may substitute for iron, yielding the more general formula
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