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. 2017 Apr 13;10(4):406. doi: 10.3390/ma10040406

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Ideal crystallographic structures of lepidocrocite (γ-FeOOH), goethite (α‑FeOOH) and akaganeite (β-FeOOH). The structures are described using FeO₆ octahedral units. Small circles: hydrogen, medium circles: chlorine [132,133].