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- Nontronite abstract "Nontronite is the iron(III) rich member of the smectite group of clay minerals. Nontronites typically have a chemical composition consisting of more than ~30% Fe2O3 and less than ~12% Al2O3 (ignited basis). Nontronite generally does not exist in economic deposits like montmorillonite, although it is not an uncommon clay mineral. Like montmorillonite, nontronite can have variable amounts of adsorbed water associated with the interlayer surfaces and the exchange cations.A typical structural formula for nontronite is Ca.5(Si7Al.8Fe.2)(Fe3.5Al.4Mg.1)O20(OH)4. The dioctahedral sheet of nontronite is composed mainly of trivalent iron (Fe3+) cations, although some substitution by trivalent aluminium (Al3+) and divalent magnesium (Mg2+) does occur. The tetrahedral sheet is composed mainly of silicon (Si4+), but can have substantial (about 1 in 8) substitiution of either Fe3+ or Al3+, or combinations of these two cations. Thus, nontronite typically is characterised by having most (usually greater than 60%) of the layer charge located in the tetrahedral sheet. The layer charge is typically balanced by divalent calcium (Ca2+) or magnesium (Mg2+).Nontronite forms from the weathering of biotite and basalts, precipitation of iron and silicon rich hydrothermal fluids and in deep sea hydrothermal vents. Some evidence suggests that microorganisms may play an important role in their formation. Microorganisms are also involved in reduction of structural iron in nontronite when soils undergo anoxia, and the reduced form of the clay appears to be highly reactive towards certain pollutants, perhaps contributing to the destruction of these compounds in the environment.".
- Nontronite thumbnail Mineraly.sk_-_nontronit.jpg?width=300.
- Nontronite wikiPageID "5940660".
- Nontronite wikiPageLength "4103".
- Nontronite wikiPageOutDegree "23".
- Nontronite wikiPageRevisionID "546684971".
- Nontronite wikiPageWikiLink Aluminium.
- Nontronite wikiPageWikiLink Aluminum.
- Nontronite wikiPageWikiLink Basalt.
- Nontronite wikiPageWikiLink Biotite.
- Nontronite wikiPageWikiLink Calcium.
- Nontronite wikiPageWikiLink Category:Clay_minerals_group.
- Nontronite wikiPageWikiLink Category:Smectite_group.
- Nontronite wikiPageWikiLink Clay_minerals.
- Nontronite wikiPageWikiLink Divalent.
- Nontronite wikiPageWikiLink Hydrogen.
- Nontronite wikiPageWikiLink Hydrothermal.
- Nontronite wikiPageWikiLink Hydrothermal_circulation.
- Nontronite wikiPageWikiLink Iron.
- Nontronite wikiPageWikiLink Magnesium.
- Nontronite wikiPageWikiLink Monoclinic.
- Nontronite wikiPageWikiLink Monoclinic_crystal_system.
- Nontronite wikiPageWikiLink Montmorillonite.
- Nontronite wikiPageWikiLink Oxygen.
- Nontronite wikiPageWikiLink Phyllosilicate.
- Nontronite wikiPageWikiLink Silicate_minerals.
- Nontronite wikiPageWikiLink Silicon.
- Nontronite wikiPageWikiLink Slovakia.
- Nontronite wikiPageWikiLink Smectite.
- Nontronite wikiPageWikiLink Tetrahedral.
- Nontronite wikiPageWikiLink Tetrahedron.
- Nontronite wikiPageWikiLink Trivalent.
- Nontronite wikiPageWikiLink Valence_(chemistry).
- Nontronite wikiPageWikiLink Weathering.
- Nontronite wikiPageWikiLinkText "Nontronite".
- Nontronite wikiPageWikiLinkText "nontronite".
- Nontronite wikiPageWikiLinkText "nontronitic".
- Nontronite birefringence "δ = 0.030 - 0.035".
- Nontronite caption "Nontronite from Slovakia".
- Nontronite category "Phyllosilicates".
- Nontronite category "Smectite group".
- Nontronite cleavage "Perfect basal".
- Nontronite color "Yellow, olive-green, green, orange, brown".
- Nontronite formula "0.3".
- Nontronite gravity "2.3".
- Nontronite habit "Earthy masses".
- Nontronite hasPhotoCollection Nontronite.
- Nontronite luster "Earthy to dull".
- Nontronite mohs "1.5".
- Nontronite name "Nontronite".
- Nontronite opticalprop "Biaxial".
- Nontronite refractive "nα = 1.530 - 1.580 nβ = 1.555 - 1.612 nγ = 1.560 - 1.615".
- Nontronite streak "Colorless".
- Nontronite system Monoclinic.
- Nontronite system Monoclinic_crystal_system.
- Nontronite wikiPageUsesTemplate Template:Clay_minerals.
- Nontronite wikiPageUsesTemplate Template:Infobox_mineral.
- Nontronite wikiPageUsesTemplate Template:Phyllosilicates.
- Nontronite subject Category:Clay_minerals_group.
- Nontronite subject Category:Smectite_group.
- Nontronite hypernym Member.
- Nontronite type ChemicalSubstance.
- Nontronite type Group.
- Nontronite type Mineral.
- Nontronite type Person.
- Nontronite type Group.
- Nontronite type Phyllosilicate.
- Nontronite type ChemicalObject.
- Nontronite type Thing.
- Nontronite type Q7946.
- Nontronite comment "Nontronite is the iron(III) rich member of the smectite group of clay minerals. Nontronites typically have a chemical composition consisting of more than ~30% Fe2O3 and less than ~12% Al2O3 (ignited basis). Nontronite generally does not exist in economic deposits like montmorillonite, although it is not an uncommon clay mineral.".
- Nontronite label "Nontronite".
- Nontronite sameAs Nontronita.
- Nontronite sameAs Nontronit.
- Nontronite sameAs Nontronita.
- Nontronite sameAs نونترونیت.
- Nontronite sameAs Nontronite.
- Nontronite sameAs Nontroniet.
- Nontronite sameAs Nontronit.
- Nontronite sameAs m.0ffn45.
- Nontronite sameAs Nontronit.
- Nontronite sameAs Nontronit.
- Nontronite sameAs Q420274.
- Nontronite sameAs Q420274.
- Nontronite wasDerivedFrom Nontronite?oldid=546684971.
- Nontronite depiction Mineraly.sk_-_nontronit.jpg.
- Nontronite isPrimaryTopicOf Nontronite.
- Nontronite name "Nontronite".