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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 wikiPageRevisionID "546686296".
- 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 hasPhotoCollection Allophane.
- Allophane luster "Waxy".
- Allophane mohs "3".
- Allophane name "Allophane".
- Allophane streak "White".
- Allophane strunz "9".
- Allophane system "Amorphous".
- Allophane tenacity "Brittle".
- Allophane subject Category:Aluminium_minerals.
- Allophane subject Category:Phyllosilicates.
- Allophane type Abstraction100002137.
- Allophane type AluminiumMinerals.
- Allophane type Material114580897.
- Allophane type Matter100020827.
- Allophane type Mineral114662574.
- Allophane type Part113809207.
- Allophane type PhysicalEntity100001930.
- Allophane type Relation100031921.
- Allophane type Substance100019613.
- Allophane type ChemicalSubstance.
- Allophane type Mineral.
- Allophane type ChemicalObject.
- Allophane type Thing.
- 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 "Allofaan".
- Allophane label "Allofane".
- Allophane label "Allofanita".
- Allophane label "Allophan".
- Allophane label "Allophane".
- Allophane label "Allophane".
- Allophane sameAs Allofán.
- Allophane sameAs Allophan.
- Allophane sameAs Αλλοφανής.
- Allophane sameAs Allofanita.
- Allophane sameAs Allophane.
- Allophane sameAs Allofane.
- Allophane sameAs Allofaan.
- Allophane sameAs m.07wnln.
- Allophane sameAs Q429712.
- Allophane sameAs Q429712.
- Allophane sameAs Allophane.
- Allophane wasDerivedFrom Allophane?oldid=546686296.
- Allophane depiction Allophane-277529.jpg.
- Allophane isPrimaryTopicOf Allophane.
- Allophane name "Allophane".
