Siderogel

Siderogel is an amorphous mineral (a mineraloid) consisting of iron(III) oxide-hydroxide FeO(OH), the same chemical compound as limonite and goethite;[1] or possibly an hydrate of the same FeO(OH)•nH
2O.[2]

Siderogel is described as blackish, brownish, or reddish-brown, often glassy and translucent.[3] It may be a gossan, the result of weathering and oxidation of sulfide ores.[4]

The International Mineralogical Association does not officially recognize siderogel as a mineral species.[5]

Occurrence

Siderogel has been reported in a few locations in Europe and Asia, including a site near Gavà and Bruguers, Catalunya;[1] in the mine of Codos, Aragon;[6] in the Becke-Oese quarry (now flooded) between Menden and Hemer, Germany;[3] and in the Gaosong deposit, Gejiu China.[4]

See also
  • Alumogel
  • Stilpnosiderite

References
  1. Eugeni Bareche (2006): Els minerals de Catalunya, segle XX (in Catalan language). Grup Mineralògic Català. ISBN 84-609-9071-0.
  2. 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
  3. Siderogel. MinDat minerals database. Accessed on 2019-02-14.
  4. 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
  5. IMA (2018): "The New IMA List of Minerals", version of November 2018. Accessed on 2019-02-14.
  6. Emilio Romero (2017): Patrimonio Geológico y Minero: Una apuesta por el desarrollo local sostenible, page 260 (in Spanish). Universidad de Huelva, 100 pages. ISBN 9788416872541
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