Editing Iron oxide (section)

==Oxide-hydroxides==
{{main|iron(III) oxide-hydroxide}}
* [[goethite]] (α-FeOOH)
* [[akaganéite]] (β-FeOOH)
* [[lepidocrocite]] (γ-FeOOH)
* [[feroxyhyte]] (δ-FeOOH)
* [[ferrihydrite]] (Fe<sub>5</sub>HO<sub>8</sub> · 4 H<sub>2</sub>O approx., or 5 Fe<sub>2</sub>O<sub>3</sub> · 9 H<sub>2</sub>O, better recast as FeOOH · 0.4 H<sub>2</sub>O)
* high-pressure pyrite-structured FeOOH.<ref>{{Cite journal|last1=Nishi|first1=Masayuki|last2=Kuwayama|first2=Yasuhiro|last3=Tsuchiya|first3=Jun|last4=Tsuchiya|first4=Taku|date=2017|title=The pyrite-type high-pressure form of FeOOH|url=https://www.nature.com/articles/nature22823|journal=Nature|language=en|volume=547|issue=7662|pages=205–208|doi=10.1038/nature22823|pmid=28678774|bibcode=2017Natur.547..205N |s2cid=205257075|issn=1476-4687|url-access=subscription}}</ref> Once [[Dehydration reaction|dehydration]] is triggered, this phase may form FeO<sub>2</sub>H<sub>''x''</sub> (0 < ''x'' < 1).<ref>{{cite journal|last1=Hu|first1=Qingyang|last2=Kim|first2=Duckyoung|last3=Liu|first3=Jin|last4=Meng|first4=Yue|last5=Liuxiang|first5=Yang|last6=Zhang|first6=Dongzhou|last7=Mao|first7=Wendy L.|author-link7=Wendy Mao|last8=Mao|first8=Ho-kwang|year=2017|title=Dehydrogenation of goethite in Earth's deep lower mantle|journal=Proceedings of the National Academy of Sciences|volume=114|issue=7|pages=1498–1501|doi=10.1073/pnas.1620644114|pmc=5320987|pmid=28143928|bibcode=2017PNAS..114.1498H |doi-access=free}}</ref>
* [[green rust]] (Fe{{sup sub|III|''x''}}Fe{{sup sub|II|''y''}}OH<sub>3''x'' + ''y'' − ''z''</sub> (A<sup>−</sup>)<sub>''z''</sub> where A<sup>−</sup> is Cl<sup>−</sup> or 0.5 {{chem2|SO4(2-)}})