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Imogolite Mineral Data

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General Imogolite Information

Help on Chemical  Formula: Chemical Formula: Al2SiO3(OH)4
Help on Composition: Composition: Molecular Weight = 198.08 gm
   Aluminum  27.24 %  Al   51.48 % Al2O3
   Silicon   14.18 %  Si   30.33 % SiO2
   Hydrogen   2.04 %  H    18.19 % H2O
   Oxygen    56.54 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al2SiO3(OH)4
Help on Environment: Environment: Principally in soils derived from volcanic ash.
Help on IMA Status: IMA Status: Approved IMA 1962
Help on Locality: Locality: Imogo soil, Hitoyoshi, Kumamoto Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Imogolite + Pronunciation Say IMOGOLITE
Help on Synonym: Synonym: Grunlingite

Imogolite Image

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Comments: Tan powdery massive imogolite.
Location: Fukaiwa, Nanuma-shi, Tochigi, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Imogolite Crystallography

Help on Crystal System: Crystal System: Monoclinic Space Group: ?
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 16(1), 7.9(0.7), 3.3(0.65),

Physical Properties of Imogolite

Help on Color: Color: Yellowish white, Light brownish yellow, Blue, Green, Brown.
Help on Density: Density: 2.7
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Streak: Streak: white

Optical Properties of Imogolite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.216 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1815,KC= 0.2315
Ncalc = 1.63
Help on Optical Data: Optical Data: Isotropic, n=1.47-1.51.

Calculated Properties of Imogolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Imogolite =2.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0068961138
Boson Index = 0.9931038862
Help on Photoelectric: Photoelectric: PEImogolite = 1.38 barns/electron
U=PEImogolite x rElectron Density= 3.77 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Imogolite is Not Radioactive

Imogolite Classification

Help on  Dana Class: Dana Class: (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.01)with 1:1 layers
  (71.01.04)Allophane group Allophane Al2O3•(SiO2)1.3-2•((H2O))2.5-3 None Hisingerite Fe2Si2O5(OH)4•2(H2O) Unk Mono Imogolite Al2SiO3(OH)4 ? Mono Neotocite (Mn,Fe)SiO3•(H2O)(?) None Zinalsite! Zn2AlSi2O5(OH)4•2(H2O)(?) Mono
Help on  Strunz Class: Strunz Class: 09.ED.20 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.ED -Phyllosilicates with kaolinite layers
09.ED.20 Allophane Al2O3•(SiO2)1.3-2•((H2O))2.5-3 None
09.ED.20 Chrysocolla (Cu,Al)2H2Si2O5(OH)4•n(H2O) Unk Ortho
09.ED.20 Neotocite (Mn,Fe)SiO3•(H2O)(?) None
09.ED.20 Imogolite Al2SiO3(OH)4 ? Mono

Other Imogolite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 09.ED.20





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