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Schwertmannite: A unique mineral, contains a replaceable ligand, transforms to jarosites, hematites and/or basic iron sulfate

Author(s):
R.J. Barham

An infrared study is made of the chemical changes of synthetic schwertmannite, which normally is a coal oxidation by-product formed by thiobacillus ferrooxidan bacteria. Schwertmannite, a class of minerals, is a metastable compound that transforms to jarosite, hematite, and/or basic iron sulfate at relatively low temperatures, and is analogous in structure to basic iron sulfate, but with a –Fe–O– cage. A proposed formula for schwertmannite is Fe4O4(OH)2 · AN(2/e) * nH2O, where AN is the anion and e is its charge, where sulfate can be replaced with other anions, a possible catalyst. The facile conversion of schwertmannite to a black or yellow material might make a useful raw material for the pigment industry.

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Volume: 12
#: 10
Pages: 2751-2758
DOI: 10.1557/JMR.1997.0366