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- Allophane abstract "Allophane is an amorphous to poorly crystalline hydrous aluminium silicate clay mineraloid. Its chemical formula is Al2O3·(SiO2)1.3-2·(2.5-3)H2O. Since it has short-range atomic order, it is a mineraloid, rather than a mineral, and can be identified by its distinctive infrared spectrum and its X-ray diffraction pattern. It was first described in 1816 in Gräfenthal, Thuringia, Germany. Allophane is a weathering or hydrothermal alteration product of volcanic glass and feldspars and sometimes has a composition similar to kaolinite but generally has a molar ratio of Al:Si = 2. It typically forms under mildly acidic to neutral pH (5-7). Its structure has been debated, but it is similar to clay minerals and is composed of curved alumina octahedral and silica tetrahedral layers. Transmission electron micrographs show that it is generally made up of aggregates of hollow spherules ~3-5 nm in diameter. Allophane can alter to form halloysite under resilicating aqueous conditions and can alter to form gibbsite under desilicating conditions. A copper containing variety cupro-allophane has been reported.It forms waxy botryoidal to crusty masses with color varying from white through green, blue, yellow, to brown. It has a Mohs hardness of 3 and a specific gravity of 1.0.It was named from the Greek allos - \"other\" and phanos - \"to appear\", as it gave a deceptive reaction in the blowpipe flame in old mineralogical testing.".
- Allophane thumbnail Allophane-277529.jpg?width=300.
- Allophane wikiPageExternalLink allophane.pdf.
- Allophane wikiPageExternalLink Allophane.shtml.
- Allophane wikiPageExternalLink min-139.html.
- Allophane wikiPageID "2668337".
- Allophane wikiPageLength "3386".
- Allophane wikiPageOutDegree "26".
- Allophane wikiPageRevisionID "688385071".
- Allophane wikiPageWikiLink Aluminium.
- Allophane wikiPageWikiLink Amorphous_solid.
- Allophane wikiPageWikiLink Blowpipe_(tool).
- Allophane wikiPageWikiLink Category:Aluminium_minerals.
- Allophane wikiPageWikiLink Category:Phyllosilicates.
- Allophane wikiPageWikiLink Clay.
- Allophane wikiPageWikiLink Clay_minerals.
- Allophane wikiPageWikiLink Copper.
- Allophane wikiPageWikiLink Feldspar.
- Allophane wikiPageWikiLink Germany.
- Allophane wikiPageWikiLink Gibbsite.
- Allophane wikiPageWikiLink Greek_language.
- Allophane wikiPageWikiLink Halloysite.
- Allophane wikiPageWikiLink Infrared.
- Allophane wikiPageWikiLink Kaolinite.
- Allophane wikiPageWikiLink Metasomatism.
- Allophane wikiPageWikiLink Mineraloid.
- Allophane wikiPageWikiLink Mohs_scale_of_mineral_hardness.
- Allophane wikiPageWikiLink Serpentine_subgroup.
- Allophane wikiPageWikiLink Silicate.
- Allophane wikiPageWikiLink Silicate_minerals.
- Allophane wikiPageWikiLink Specific_gravity.
- Allophane wikiPageWikiLink Thuringia.
- Allophane wikiPageWikiLink Volcanic_glass.
- Allophane wikiPageWikiLink Weathering.
- Allophane wikiPageWikiLink X-ray_crystallography.
- Allophane wikiPageWikiLinkText "Allophane".
- Allophane wikiPageWikiLinkText "allophane".
- Allophane wikiPageWikiLinkText "allophanic clays".
- Allophane caption "Allophane from Maid of Sunshine Mine, Courtland-Gleeson District, Cochise County, Arizona, USA".
- Allophane category Silicate_minerals.
- Allophane category "Kaolinite-serpentine group".
- Allophane cleavage "None".
- Allophane color "White, pale blue to sky-blue, green, brown".
- Allophane diaphaneity "Transparent, translucent".
- Allophane formula "Al2O3·1.3-2·H2O".
- Allophane fracture "Conchoidal".
- Allophane luster "Waxy".
- Allophane mohs "3".
- Allophane name "Allophane".
- Allophane streak "White".
- Allophane strunz "9".
- Allophane system "Amorphous".
- Allophane tenacity "Brittle".
- Allophane wikiPageUsesTemplate Template:Clay_minerals.
- Allophane wikiPageUsesTemplate Template:Infobox_mineral.
- Allophane wikiPageUsesTemplate Template:Silicate-mineral-stub.
- Allophane subject Category:Aluminium_minerals.
- Allophane subject Category:Phyllosilicates.
- Allophane type ChemicalSubstance.
- Allophane type Mineral.
- Allophane type Phyllosilicate.
- Allophane type ChemicalObject.
- Allophane type Thing.
- Allophane type Q7946.
- Allophane comment "Allophane is an amorphous to poorly crystalline hydrous aluminium silicate clay mineraloid. Its chemical formula is Al2O3·(SiO2)1.3-2·(2.5-3)H2O. Since it has short-range atomic order, it is a mineraloid, rather than a mineral, and can be identified by its distinctive infrared spectrum and its X-ray diffraction pattern. It was first described in 1816 in Gräfenthal, Thuringia, Germany.".
- Allophane label "Allophane".
- Allophane sameAs Q429712.
- Allophane sameAs Al·lofana.
- Allophane sameAs Allofán.
- Allophane sameAs Allophan.
- Allophane sameAs Αλλοφανής.
- Allophane sameAs Allofanita.
- Allophane sameAs آلوفان.
- Allophane sameAs Allophane.
- Allophane sameAs Allofane.
- Allophane sameAs アロフェン.
- Allophane sameAs Alofans.
- Allophane sameAs Allofaan.
- Allophane sameAs Allofan.
- Allophane sameAs m.07wnln.
- Allophane sameAs Алофан.
- Allophane sameAs Q429712.
- Allophane wasDerivedFrom Allophane?oldid=688385071.
- Allophane depiction Allophane-277529.jpg.
- Allophane isPrimaryTopicOf Allophane.
- Allophane name "Allophane".