Imogolite Mineral Data

Imogolite Mineral Data +

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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.

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

Diaphaniety:

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

Optical Data:

Isotropic, n=1.47-1.51.

Calculated Properties of Imogolite

Electron Density:

r_electron=2.73 gm/cc
note: r_Imogolite=2.70 gm/cc.

Fermion Index

Fermion Index = 0.00689
Boson Index = 0.99311

Photoelectric:

PE_Imogolite= 1.38 barns/electron
U=PE_Imogolite x r_electron= 3.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Imogolite is Not Radioactive

Imogolite Classification

Dana Class:

71.1.4.3 (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

Strunz Class:

VIII/H.26-30 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 Imogolite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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Imogolite

Al2SiO3(OH)4
Dana No: 71.1.4.3 Strunz No: VIII/H.26-30
Locality:

Notes: