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Imogolite Mineral Data
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General Imogolite Information
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 Chemical Formula: |
Al2SiO3(OH)4 |
| Composition: |
Molecular Weight = 198.08 gm |
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Aluminum 27.24 % Al 51.48 % Al2O3 |
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Silicon 14.18 % Si 30.33 % SiO2 |
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Hydrogen 2.04 % H 18.19 % H2O |
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Oxygen 56.54 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Al2SiO3(OH)4 |
| Environment: |
Principally in soils derived from volcanic ash. |
| IMA Status: |
Approved IMA 1962 |
| Locality: |
Imogo soil, Hitoyoshi, Kumamoto Prefecture, Japan. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Imogolite + Pronunciation  |
| Synonym: |
Grunlingite |
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Imogolite Image |
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Images:
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Imogolite Crystallography
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| Crystal System: |
Monoclinic Space Group: ? |
| X Ray Diffraction: |
By Intensity(I/Io): 16(1), 7.9(0.7), 3.3(0.65), |
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Physical Properties of Imogolite
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| Color: |
Yellowish white, Light brownish yellow, Blue, Green, Brown. |
| Density: |
2.7 |
| Diaphaneity: |
Transparent |
| Habit: |
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). |
| Hardness: |
2-3 - Gypsum-Calcite |
| Streak: |
white |
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Optical Properties of Imogolite
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| Gladstone-Dale: |
CI meas= 0.216 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1815,KC= 0.2315
Ncalc = 1.63 |
| Optical Data: |
Isotropic, n=1.47-1.51. |
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Calculated Properties of Imogolite
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| Electron Density: |
Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Imogolite =2.70 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0068961138
Boson Index = 0.9931038862 |
| Photoelectric: |
PEImogolite = 1.38 barns/electron
U=PEImogolite x rElectron Density= 3.77 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Imogolite is Not Radioactive |
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Imogolite Classification
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| Dana Class: |
71.01.04.03 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.01)with 1:1 layers |
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(71.01.04)Allophane group |
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71.01.04.01 Allophane Al2O3•(SiO2)1.3-2•((H2O))2.5-3 None |
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71.01.04.02 Hisingerite Fe2Si2O5(OH)4•2(H2O) Unk Mono |
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71.01.04.03 Imogolite Al2SiO3(OH)4 ? Mono |
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71.01.04.04 Neotocite (Mn,Fe)SiO3•(H2O)(?) None |
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71.01.04.05 Zinalsite! Zn2AlSi2O5(OH)4•2(H2O)(?) Mono |
| Strunz Class: |
09.ED.20 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.ED -Phyllosilicates with kaolinite layers |
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09.ED.20 Allophane Al2O3•(SiO2)1.3-2•((H2O))2.5-3 None |
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09.ED.20 Chrysocolla (Cu,Al)2H2Si2O5(OH)4•n(H2O) Unk Ortho |
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09.ED.20 Neotocite (Mn,Fe)SiO3•(H2O)(?) None |
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09.ED.20 Imogolite Al2SiO3(OH)4 ? Mono |
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Other Imogolite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
| See Also: |
Links to other databases for Imogolite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Print or Cut-and-Paste your Imogolite Specimen Label here :
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Imogolite
Al2SiO3(OH)4
Dana No: 71.01.04.03 Strunz No: 09.ED.20
Locality:
Notes:
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