Imogolite Mineral Data

General Imogolite Information

Chemical Formula:

Al2SiO3(OH)4

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

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

Imogolite Image

Images:

Imogolite

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

Imogolite Crystallography

Crystal System:

MonoclinicSpace Group: ?

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 16(1), 7.9(0.7), 3.3(0.65),

Physical Properties of Imogolite

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

Optical Properties of Imogolite

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.

Calculated Properties of Imogolite

Electron Density:

Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Imogolite =2.70 gm/cc.

Fermion Index:

Fermion Index = 0.0068961138
Boson Index = 0.9931038862

Photoelectric:

PE_Imogolite= 1.38 barns/electron
U=PE_Imogolite x rElectron Density= 3.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Imogolite is Not Radioactive

Imogolite Classification

Dana Class:

71.01.04.03 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.01)with 1:1 layers

(71.01.04)Allophane group

71.01.04.01 Allophane Al2O3•(SiO2)1.3-2•((H2O))2.5-3 None

71.01.04.02 Hisingerite Fe2Si2O5(OH)4•2(H2O) Unk Mono

71.01.04.03 Imogolite Al2SiO3(OH)4 ? Mono

71.01.04.04 Neotocite (Mn,Fe)SiO3•(H2O)(?) None

71.01.04.05 Zinalsite! Zn2AlSi2O5(OH)4•2(H2O)(?) Mono

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

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 :

Imogolite

Al2SiO3(OH)4
Dana No: 71.01.04.03 Strunz No: 09.ED.20
Locality:

Notes: