Siderogel is an amorphous

mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. ( ...

mineraloid A mineraloid is a naturally occurring mineral-like substance that does not demonstrate crystallinity. Mineraloids possess chemical compositions that vary beyond the generally accepted ranges for specific minerals. For example, obsidian is an amor ...

) consisting of

iron(III) oxide-hydroxide Iron(III) oxide-hydroxide or ferric oxyhydroxideA. L. Mackay (1960): "β-Ferric Oxyhydroxide". ''Mineralogical Magazine'' (''Journal of the Mineralogical Society''), volume 32, issue 250, pages 545-557. is the chemical compound of iron, oxygen, ...

, the same

chemical compound A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element ...

limonite Limonite () is an iron ore consisting of a mixture of hydrated iron(III) oxide-hydroxides in varying composition. The generic formula is frequently written as FeO(OH)·H2O, although this is not entirely accurate as the ratio of oxide to hydroxid ...

and

goethite Goethite (, ) is a mineral of the diaspore group, consisting of iron(III) oxide-hydroxide, specifically the "α" polymorph. It is found in soil and other low-temperature environments such as sediment. Goethite has been well known since ancient t ...

; or possibly an hydrate of the same •''n''.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 (colloquially) , former_name = eidgenössische polytechnische Schule , image = ETHZ.JPG , image_size = , established = , type = Public , budget = CHF 1.896 billion (2021) , rector = Günther Dissertori , president = Joël Mesot , ac ...

; 227 pages. Siderogel is described as blackish, brownish, or reddish-brown, often glassy and translucent. It may be a

gossan Gossan (eiserner hut or eisenhut) is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein. In the ''classic'' gossan or iron cap all that remains is iron oxides and quartz, often i ...

, the result of

weathering Weathering is the deterioration of rocks, soils and minerals as well as wood and artificial materials through contact with water, atmospheric gases, and biological organisms. Weathering occurs ''in situ'' (on site, with little or no movement), ...

and

oxidation Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a d ...

sulfide ore Sulfide (British English also sulphide) is an inorganic anion of sulfur with the chemical formula S2− or a compound containing one or more S2− ions. Solutions of sulfide salts are corrosive. ''Sulfide'' also refers to chemical compounds lar ...

s. The

International Mineralogical Association Founded in 1958, the International Mineralogical Association (IMA) is an international group of 40 national societies. The goal is to promote the science of mineralogy and to standardize the nomenclature of the 5000 plus known mineral species. Th ...

does not officially recognize siderogel as a mineral species.IMA (2018):
The New IMA List of Minerals
, version of November 2018. Accessed on 2019-02-14.

Occurrence

Siderogel has been reported in a few locations in Europe and Asia, including a site near

Gavà Gavà () is a municipality in the Baix Llobregat comarca, in the province of Barcelona in Catalonia, Spain. It borders the coast of the Mediterranean Sea between Viladecans and Castelldefels. Gavà has a beach and two population centers: the cit ...

and Bruguers,

Catalunya Catalonia (; ca, Catalunya ; Aranese Occitan: ''Catalonha'' ; es, Cataluña ) is an autonomous community of Spain, designated as a ''nationality'' by its Statute of Autonomy. Most of the territory (except the Val d'Aran) lies on the northe ...

;Eugeni Bareche (2006): ''Els minerals de Catalunya, segle XX'' (in

Catalan language Catalan (; autonym: , ), known in the Valencian Community and Carche as ''Valencian'' (autonym: ), is a Western Romance language. It is the official language of Andorra, and an official language of three autonomous communities in eastern Spa ...

). Grup Mineralògic Català. . in the mine of Codos, Aragon;Emilio Romero (2017):
Patrimonio Geológico y Minero: Una apuesta por el desarrollo local sostenible
', page 260 (in

Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many Latin American countries **Spanish cuisine Other places * Spanish, Ontario, Cana ...

). Universidad de Huelva, 100 pages. in the Becke-Oese quarry (now flooded) between

Menden Menden (, official name: ''Menden (Sauerland)''; Westphalian: ''Mennen'') is a city in the district Märkischer Kreis, in North Rhine-Westphalia, Germany. It is located at the north end of the Sauerland near the Ruhr river. History Menden's f ...

and

Hemer Hemer is a town in the Märkischer Kreis district, in North Rhine-Westphalia, Germany. Geography Hemer is located at the north end of the Sauerland near the Ruhr (river), Ruhr river. The highest elevation, at 546 metres (1,791 ft), is in th ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

;Siderogel
''MinDat'' minerals database. Accessed on 2019-02-14. and in the Gaosong deposit,

Gejiu (, ; Hani: ''Goqjef''; formerly known as Kochiu) is a county-level city and the former capital of Honghe prefecture, Yunnan Province, China, and has 202,000 urban inhabitants (ranked 14th largest city in Yunnan). It is the site of the country's ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

.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.

References

Oxide minerals {{oxide-mineral-stub

Occurrence

See also

References