Allophane
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 elec
primaryTopic
Allophane
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 elec
has abstract
Allophan (auch Elhuyarit, Ilba ...... Farbe bei weißer Strichfarbe.
@de
Allophane is an amorphous to p ...... in old mineralogical testing.
@en
Het mineraal allofaan is een g ...... behoort tot de fylosilicaten.
@nl
L'allofane è un minerale. Deri ...... a) dava risultati ingannatori.
@it
La allofanita es un hidrosilic ...... o pequeño morfología de bolas.
@es
Un allophane, est une espèce m ...... é de synonymes et de variétés.
@fr
アロフェン(Allophane)は、アモルファスまたは結晶化 ...... と「現れる」を意味するphanosという言葉から命名された。
@ja
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Wikipage page ID
Wikipage revision ID
737,827,261
Caption
Allophane from Maid of Sunshin ...... t, Cochise County, Arizona, US
category
Kaolinite-serpentine group
color
White, pale blue to sky-blue, green, brown
diaphaneity
Transparent, translucent
formula
Al2O3·1.3-2·H2O
fracture
system
tenacity
comment
Allophan (auch Elhuyarit, Ilba ...... nterschiedlichen Gehalten vor.
@de
Allophane is an amorphous to p ...... dral layers. Transmission elec
@en
Het mineraal allofaan is een g ...... behoort tot de fylosilicaten.
@nl
L'allofane è un minerale. Deri ...... a) dava risultati ingannatori.
@it
La allofanita es un hidrosilic ...... o pequeño morfología de bolas.
@es
Un allophane, est une espèce m ...... é de synonymes et de variétés.
@fr
アロフェン(Allophane)は、アモルファスまたは結晶化 ...... と「現れる」を意味するphanosという言葉から命名された。
@ja
label
Allofaan
@nl
Allofane
@it
Allofanita
@es
Allophan
@de
Allophane
@en
Allophane
@fr
アロフェン
@ja
wasDerivedFrom
depiction
isPrimaryTopicOf
name
Allophane
@en