Imogolite (original) (raw)

A valid IMA mineral species

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About ImogoliteHide

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Colour:

White, blue, green, brown, black

Lustre:

Vitreous, Resinous, Waxy

Name:

For the Japanese name, Imogo, of the brownish yellow volcanic ash soil of Japan in which it occurs.

Described in 1962, rejected by the IMA, but the name Imogolite was approved by the AIPEA Nomenclature Committee at its 1970 Tokyo meeting (Clays and Clay Minerals 19, 131 (1971). Reapproved by the CNMMN in 1986.

Widespread component of volcanic-ash-derived soils, but occurs also in other environments. The nano-sized particles have a tube-like morphology. There is longer-range order along the tube but with a cross-section of a few nanometers. The mineral essentially consists of a single modified gibbsite sheet rolled into a tube.

Related to allophane, another nanomineral.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2021:9

b0e69d60-253d-4b8b-81a5-5bf034502f1d

IMA Classification of ImogoliteHide

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Approval history:

Rejected in 1962, approved in 1986.

Type description reference:

Classification of ImogoliteHide

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9.ED.20

9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets

71.1.5.3

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol Source Reference
Imo IMA–CNMNC Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Imo Warr (2020) Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

Physical Properties of ImogoliteHide

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Transparency:

Transparent, Translucent

Colour:

White, blue, green, brown, black

Density:

2.70 g/cm3 (Measured) 2.70 g/cm3 (Calculated)

Optical Data of ImogoliteHide

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RI values:

n = 1.47 - 1.51

Birefringence:

Isotropic minerals have no birefringence

Chemistry of ImogoliteHide

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Mindat Formula:

Al2SiO3(OH)4

Crystallography of ImogoliteHide

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Cell Parameters:

c = 8.4 Å

Morphology:

Conchoidal to earthy; as microscopic threadlike particles, and bundles of fine tubes, each about 20Å in diameter

Comment:

5.1 perpendicular to c axis

Geological EnvironmentHide

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Type Occurrence of ImogoliteHide

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Geological Setting of Type Material:

Decomposition product of volcanic ash in soils in humid environments.

Reference:

Yoshinaga, N., Aomine, S. (1962) Imogolite in some Ando soils. Soil Science and Plant Nutrition: 8: 114-121.

Other Language Names for ImogoliteHide

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Related Minerals - Strunz-mindat GroupingHide

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9.ED. Clinochrysotile Mon. 2/m
9.ED.05 Dickite Al2(Si2O5)(OH)4 Mon. m : B b
9.ED.05 Kaolinite Al2(Si2O5)(OH)4 Tric. 1 : _P_1
9.ED.05 Nacrite Al2(Si2O5)(OH)4 Mon. m : B b
9.ED.05 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4 Mon. m : B m
9.ED.10 Halloysite Al2(Si2O5)(OH)4 Mon. m : B b
9.ED.10 Hisingerite Fe3+2(Si2O5)(OH)4 · 2H2O Mon.
9.ED.10 Hydrohalloysite Al2Si2O5(OH)4 · 2H2O Mon. m
9.ED.15 Amesite Mg2Al(AlSiO5)(OH)4 Tric. 1 : _P_1
9.ED.15 Antigorite Mg3(Si2O5)(OH)4 Mon. m : B m
9.ED.15 Berthierine (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4 Mon. m : B m
9.ED.15 Brindleyite (Ni,Al)3(Si,Al)2O5(OH)4 Mon.
9.ED.15 Caryopilite Mn2+3Si2O5(OH)4 Mon.
9.ED.15 Cronstedtite Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4 Trig. 3_m_ : P_31_m
9.ED.15 Fraipontite (Zn,Al)3((Si,Al)2O5)(OH)4 Mon.
9.ED.15 Greenalite (Fe2+,Fe3+)2-3Si2O5(OH)4 Mon.
9.ED.15 Kellyite Mn2+2Al(AlSiO5)(OH)4 Hex. 6 : _P_63
9.ED.15 Lizardite Mg3(Si2O5)(OH)4 Trig. 3_m_ : P_31_m
9.ED.15 Manandonite Li2Al4(Si2AlB)O10(OH)8 Orth. 222 : _C_2221
9.ED.15 Népouite Ni3Si2O5(OH)4 Orth.
9.ED.15 Pecoraite Ni3(Si2O5)(OH)4 Mon.
9.ED.15 Guidottiite Mn2Fe3+(Fe3+SiO5)(OH)4 Hex. 6 : _P_63
9.ED.15 va Chromoamesite Mg2(Al,Cr)(AlSiO5)(OH)4
9.ED.20 Allophane (Al2O3)(SiO2)1.3-2 · 2.5-3H2O Amor.
9.ED.20 Chrysocolla Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 Orth.
9.ED.20 Neotocite (Mn,Fe,Mg)SiO3 · H2O Amor.
9.ED.25 Bismutoferrite Fe3+2Bi(SiO4)2(OH) Mon. m : B m
9.ED.25 Chapmanite Fe3+2Sb3+(Si2O5)O3(OH) Mon. m : B m
9.ED.30 Pianlinite Al2Si2O6(OH)2 Orth.

Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

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References for ImogoliteHide

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Reference List:

Cradwick, P.D.G., Farmer, V.C., Russell, J.D., Masson, C.R., Wada, K., Yoshinaga, N. (1972) Imogolite, a hydrated aluminum silicate of tubular structure. Nature Physical Science: 240(104): 187-189.

Hawthorne, Frank C., Burke, Ernst A. J., Ercit, T. Scott, Grew, Edward S., Grice, Joel D., Jambor, John L., Puziewicz, Jacek, Roberts, Andrew C., Vanko, David A. (1988) New Mineral Names. American Mineralogist, 73 (1-2) 189-199

Ildefonse, Ph., Kirkpatrick, R.J., Montez, B., Calas, G., Flank, A.M., Lagarde, P. (1994) 27Al MAS NMR and Aluminum X-ray Absorption Near Edge Structure Study of Imogolite and Allophanes. Clays and Clay Minerals: 42(3): 276-287.

Localities for ImogoliteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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