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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 wikiPageRevisionID "546684971".
- 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_crystal_system.
- Nontronite wordnet_type synset-mineral-noun-1.
- Nontronite subject Category:Clay_minerals_group.
- Nontronite subject Category:Smectite_group.
- Nontronite type Abstraction100002137.
- Nontronite type Material114580897.
- Nontronite type Matter100020827.
- Nontronite type Mineral114662574.
- Nontronite type Part113809207.
- Nontronite type PhysicalEntity100001930.
- Nontronite type Relation100031921.
- Nontronite type Substance100019613.
- Nontronite type ChemicalSubstance.
- Nontronite type Mineral.
- Nontronite type ChemicalObject.
- Nontronite type Thing.
- 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 "Nontroniet".
- Nontronite label "Nontronit".
- Nontronite label "Nontronit".
- Nontronite label "Nontronita".
- Nontronite label "Nontronite".
- Nontronite label "Nontronite".
- Nontronite sameAs Nontronit.
- Nontronite sameAs Nontronita.
- Nontronite sameAs Nontronite.
- Nontronite sameAs Nontroniet.
- Nontronite sameAs Nontronit.
- Nontronite sameAs m.0ffn45.
- Nontronite sameAs Q420274.
- Nontronite sameAs Q420274.
- Nontronite sameAs Nontronite.
- Nontronite wasDerivedFrom Nontronite?oldid=546684971.
- Nontronite depiction Mineraly.sk_-_nontronit.jpg.
- Nontronite isPrimaryTopicOf Nontronite.
- Nontronite name "Nontronite".
