Allophane Mineral Data + 
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- 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
- 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
General Allophane Information |
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 Chemical Formula: |
Al2O3·(SiO2)1.3-2·((H2O))2.5-3 | ||
| 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 | |||
| Empirical Formula: |
(Al2O3)(SiO2)1.3·2.5(H2O) | ||
| IMA Status: |
Valid Species (Pre-IMA) 1816 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Name Origin: |
From the Greek allos - "other" and phanos - "to appear." | ||
| Synonym: |
Protoallophane | ||
| Schrotterite | |||
Allophane Image | |||
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Images:
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Allophane Crystallography |
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| Crystal System: |
Amorphous- No Crystals | ||
| X Ray Diffraction: |
By Intensity(I/Io): 11(1), 3.3(0.8), 2.2(0.6), | ||
Physical Properties of Allophane |
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| Cleavage: |
None | ||
| Color: |
White, Green, Blue, Yellow, Brown. | ||
| Density: |
1.9 | ||
| Diaphaniety: |
Translucent | ||
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | ||
| Habit: |
Botryoidal - "Grape-like" rounded forms (e.g.. malachite). | ||
| Habit: |
Encrustations - Forms crust-like aggregates on matrix. | ||
| Habit: |
Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite). | ||
| Hardness: |
3 - Calcite | ||
| Luminescence: |
None. | ||
| Luster: |
Waxy | ||
| Streak: |
white | ||
Optical Properties of Allophane |
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| Gladstone-Dale: |
CI meas= -0.087 (Poor) - where the CI = (1-KPDmeas/KC) KPDmeas= 0.2542,KC= 0.234 |
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| Optical Data: |
Isotropic, n=1.47-1.496. | ||
Calculated Properties of Allophane |
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| Electron Density: |
relectron=1.92 gm/cc |
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| Fermion Index |
Fermion Index = 0.00785 Boson Index = 0.99215 |
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| Photoelectric: |
PEAllophane = 1.37 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Allophane is Not Radioactive |
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Allophane Classification |
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| Dana Class: |
71.1.4.1 (71)Phyllosilicate Sheets of Six-Membered Rings | ||
| (71.1)with 1:1 layers | |||
| (71.1.4)Allophane group | |||
| 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 | |||
Other Allophane Information |
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| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Duda&Rejl90) OPTIC PROP.(Heinrich65) | ||
| 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 Search for Allophane using: Visit our Advertisers for Allophane : Translate Allophane Mineral Data : Ask about Allophane here : Print or Cut-and-Paste your Allophane Specimen Label here :
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