Siderogel is an amorphous

mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2011): Mi ...

mineraloid A mineraloid is a naturally occurring substance that resembles a mineral, but does not demonstrate the crystallinity of a mineral. Mineraloid substances possess chemical compositions that vary beyond the generally accepted ranges for specific mi ...

) 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 , although this is not entirely accurate as the ratio of oxide to hydroxide can vary qu ...

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 ETH Zurich (; ) is a public university in Zurich, Switzerland. Founded in 1854 with the stated mission to educate engineers and scientists, the university focuses primarily on science, technology, engineering, and mathematics. ETH Zurich ra ...

; 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 ...

, 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, sunlight, and biological organisms. It occurs '' in situ'' (on-site, with little or no move ...

and

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

sulfide ore Sulfide (also sulphide in British English) 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 large families of ...

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. ...

does not officially recognize siderogel as a

mineral species In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2011): Mi ...

.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 ci ...

and

Bruguers Bruguers is a village within the municipality of Gavà in the ''comarca'' of Baix Llobregat, province of Barcelona, Catalonia, Spain. It lies halfway between the towns of Begues and Gavà. A notable item in Bruguers is the , also known as the '' ...

Catalunya Catalonia is an autonomous community of Spain, designated as a ''nationalities and regions of Spain, nationality'' by its Statute of Autonomy of Catalonia of 2006, Statute of Autonomy. Most of its territory (except the Val d'Aran) is situate ...

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

Catalan language Catalan () is a Western Romance languages, Western Romance language and is the official language of Andorra, and the official language of three autonomous communities of Spain, autonomous communities in eastern Spain: Catalonia, the Balearic I ...

). Grup Mineralògic Català. . in the mine of

Codos, Aragon Codos is a municipality located in the province of Zaragoza, Aragon, Spain. According to the 2009 census ( INE), the municipality has a population of 260 inhabitants. This town is located between the Sierra de Vicort and the Sierra de Algairé ...

;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 countries in the Americas **Spanish cuisine **Spanish history **Spanish culture ...

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

Menden Menden (, official name: ''Menden (Sauerland)''; Westphalian language, 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 (rive ...

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 , is in the ''Balver Wald'' in t ...

Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...

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

Gejiu Gejiu () (, ; Hani: ''Goqjef''; formerly known as Kochiu) is a county-level city in Honghe Hani and Yi Autonomous Prefecture, Yunnan Province, China, with 202,000 urban inhabitants (ranked 14th largest city in Yunnan). It is the site of China's la ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

.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