Editing Iron (section)

===Mantle minerals===
[[Ferropericlase]] {{chem2|(Mg,Fe)O}}, a solid solution of [[periclase]] (MgO) and [[wüstite]] (FeO), makes up about 20% of the volume of the [[lower mantle]] of the Earth, which makes it the second most abundant mineral phase in that region after [[silicate perovskite]] {{chem2|(Mg,Fe)SiO3}}; it also is the major host for iron in the lower mantle.<ref>Stark, Anne M. (20 September 2007) [https://web.archive.org/web/20100527235247/https://publicaffairs.llnl.gov/news/news_releases/2007/NR-07-09-03.html Researchers locate mantle's spin transition zone, leading to clues about earth's structure]. [[Lawrence Livermore National Laboratory]]</ref> At the bottom of the [[Transition zone (Earth)|transition zone]] of the mantle, the reaction γ-{{chem2|(Mg,Fe)2[SiO4] ↔ (Mg,Fe)[SiO3] + (Mg,Fe)O}} transforms [[ringwoodite|γ-olivine]] into a mixture of silicate perovskite and ferropericlase and vice versa. In the literature, this mineral phase of the lower mantle is also often called magnesiowüstite.<ref name="Ferro">[https://www.mindat.org/min-35903.html Ferropericlase]. Mindat.org</ref> [[Silicate perovskite]] may form up to 93% of the lower mantle,<ref name="Murakami">{{cite journal |last=Murakami |first=M. |author2=Ohishi Y. |author3=Hirao N. |author4=Hirose K. |year=2012 |title=A perovskitic lower mantle inferred from high-pressure, high-temperature sound velocity data |journal=Nature |volume=485 |issue=7396 |pages=90–94|bibcode=2012Natur.485...90M |doi=10.1038/nature11004 |pmid=22552097 |s2cid=4387193}}</ref> and the magnesium iron form, {{chem2|(Mg,Fe)SiO3}}, is considered to be the most abundant [[mineral]] in the Earth, making up 38% of its volume.<ref name="Sharp">{{cite journal|last1=Sharp|first1=T.|title=Bridgmanite – named at last |journal=Science |date=27 November 2014 |volume=346 |issue=6213 |pages=1057–58 |doi=10.1126/science.1261887 |pmid=25430755 |bibcode=2014Sci...346.1057S |s2cid=206563252}}</ref>