View source for Chemistry:Siderogel

'''Siderogel''' is an amorphous [[Earth:Mineral|mineral]] (a [[Earth:Mineraloid|mineraloid]]) consisting of [[Chemistry:Iron(III) oxide-hydroxide|iron(III) oxide-hydroxide]] {{chem|FeO(OH)}}, the same [[Chemistry:Chemical compound|chemical compound]] as [[Chemistry:Limonite|limonite]] and [[Chemistry:Goethite|goethite]];<ref name=bareche/> or possibly an hydrate of the same {{chem|FeO(OH)}}•''n''{{chem|H|2|O}}.<ref name=koehler>Sven Köhler (2004): ''Auswahl und Einsatz von eisenhaltigen Füllmaterialien für permeable reaktive Barrieren (PRB) zur In-situ-Grundwassersanierung am Beispiel eines Chromatschadenfalles'', page 39. Volume 222 of ''Veröffentlichungen des Instituts für Geotechnik'', ETH Zürich; 227 pages. {{ISBN|9783728129536}}</ref>
Siderogel is described as blackish, brownish, or reddish-brown, often glassy and translucent.<ref name=mindat/> It may be a [[Earth:Gossan|gossan]], the result of [[Earth:Weathering|weathering]] and oxidation of sulfide ores.<ref name=mao/>

The [[Organization:International Mineralogical Association|International Mineralogical Association]] does not officially recognize siderogel as a mineral species.<ref name=imalist>IMA (2018): "[http://nrmima.nrm.se//IMA_Master_List_%282018-11%29.pdf The New IMA List of Minerals]", version of November 2018.  Accessed on 2019-02-14.</ref>

==Occurrence==
Siderogel has been reported in a few locations in Europe and Asia, including a site near Gavà and Bruguers, Catalunya;<ref name=bareche>Eugeni Bareche (2006): ''Els minerals de Catalunya, segle XX'' (in [[Social:Catalan language|Catalan language]]). Grup Mineralògic Català. {{ISBN|84-609-9071-0}}.</ref> in the mine of Codos, Aragon;<ref>Emilio Romero (2017): ''[https://books.google.com/books?id=vDh2DgAAQBAJ&pg=PA260 Patrimonio Geológico y Minero: Una apuesta por el desarrollo local sostenible]'', page 260 (in [[Social:Spanish language|Spanish]]). Universidad de Huelva, 100 pages. {{ISBN|9788416872541}}</ref> in the Becke-Oese quarry (now flooded) between Menden and Hemer, {{wipe|Germany}};<ref name=mindat>[https://www.mindat.org/min-3649.html Siderogel]. ''MinDat'' minerals database. Accessed on 2019-02-14.</ref> and in the Gaosong deposit, Gejiu {{wipe|China}}.<ref name=mao>Jingwen Mao, Xiangkun Zhu, Yue Wang (2015), "Iron isotope fractionation during supergene weathering process and its application to constrain ore genesis in Gaosong deposit, Gejiu district, SW China". ''Gondwana Research'', volume 27, issue 3, pages 1283-1291. {{doi|10.1016/j.gr.2013.12.006}}</ref>

==See also==
* Alumogel
* Stilpnosiderite

==References==
{{reflist}}

[[Category:Oxide minerals]]


{{Sourceattribution|Siderogel}}