Allophane Mineral Data + Say ALLOPHANE


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General Allophane Information
Help on Chemical Formula: Chemical Formula: Al2O3·(SiO2)1.3-2·((H2O))2.5-3
Help on Composition: Composition: Molecular Weight = 225.11 gm
   Aluminum  23.97 %  Al   45.29 % Al2O3
   Silicon   16.22 %  Si   34.70 % SiO2
   Hydrogen   2.24 %  H    20.01 % H2O
   Oxygen    57.57 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (Al2O3)(SiO2)1.3·2.5(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1816
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek allos - "other" and phanos - "to appear."
Help on Synonym: Synonym: Protoallophane
  Schrotterite
 

Allophane Image

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Allophane

Comments: Blue, cuprian, botryoidal allophane on matrix.
Location: Reiche Zeche Mine, Himmelfahrt Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Allophane Crystallography
Help on Crystal System: Crystal System: Amorphous- No Crystals
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11(1), 3.3(0.8), 2.2(0.6),
 

Physical Properties of Allophane

Help on Cleavage: Cleavage: None
Help on Color: Color: White, Green, Blue, Yellow, Brown.
Help on Density: Density: 1.9
Help on Diaphaniety: Diaphaniety: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Waxy
Help on Streak: Streak: white
 

Optical Properties of Allophane

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.087 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2542,KC= 0.234
Help on Optical Data: Optical Data: Isotropic, n=1.47-1.496.
 

Calculated Properties of Allophane

Help on Electron Density: Electron Density:

relectron=1.92 gm/cc
note: rAllophane =1.90 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00785
Boson Index = 0.99215
Help on Photoelectric: Photoelectric:

PEAllophane = 1.37 barns/electron
U=PEAllophane x relectron= 2.64 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Allophane is Not Radioactive
 

Allophane Classification
Help on Dana Class: Dana Class: 71.1.4.1 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.1)with 1:1 layers
  (71.1.4)Allophane group
 
71.1.4.1 Allophane Al2O3·(SiO2)1.3-2·((H2O))2.5-3 None
 
71.1.4.2 Hisingerite Fe2Si2O5(OH)4·2(H2O) Unk Mono
 
71.1.4.3 Imogolite Al2SiO3(OH)4 ? Mono
 
71.1.4.4 Neotocite (Mn,Fe)SiO3·(H2O)(?) None
 
71.1.4.5 Zinalsite! Zn2AlSi2O5(OH)4·2(H2O)(?) Mono
Help on Strunz Class: Strunz Class: VIII/H.26-10 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups
  VIII/H.26 - Allophane - Sturtite series
 
VIII/H.26-10 Allophane Al2O3·(SiO2)1.3-2·((H2O))2.5-3 None
 
VIII/H.26-30 Imogolite Al2SiO3(OH)4 ? Mono
 
VIII/H.26-40 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m
 
VIII/H.26-50 Hisingerite Fe2Si2O5(OH)4·2(H2O) Unk Mono
 
VIII/H.26-60 Neotocite (Mn,Fe)SiO3·(H2O)(?) None
 
VIII/H.26-70 Sturtite* (Fe3)(Mn2,Ca,Mg)Si4O10(OH)3·10(H2O) None
 

Other Allophane Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Duda&Rejl90) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Allophane :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 - Minerals of Wisconsin 14 -QUT Mineral Atlas 15 - YupRocks 16 -École des Mines de Paris

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Allophane

Al2O3·(SiO2)1.3-2·((H2O))2.5-3
Dana No: 71.1.4.1 Strunz No: VIII/H.26-10
Locality:

 

Notes:

 
 
   
 
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