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Imogolite

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Formula:
Al2SiO3(OH)4
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).

Widespread component of volcanic-ash-derived soils, but occurs also in other environments.
The nano-sized particles have a tube-like morphology.

Related to allophane.

Classification of Imogolite

Redefined Approved
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
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First Recorded Occurrence of Imogolite

Year of Discovery:
1962
Geological Setting of First Recorded Material:
Decomposition product of volcanic ash in soils in humid environments.

Chemical Properties of Imogolite

Formula:
Al2SiO3(OH)4
Essential elements:
All elements listed in formula:

Relationship of Imogolite to other Species

9.ED.05DickiteAl2(Si2O5)(OH)4
9.ED.05KaoliniteAl2(Si2O5)(OH)4
9.ED.05NacriteAl2(Si2O5)(OH)4
9.ED.05Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4
9.ED.10HalloysiteAl2(Si2O5)(OH)4
9.ED.10HisingeriteFe23+(Si2O5)(OH)4 · 2H2O
9.ED.10Halloysite-7ÅAl2(Si2O5)(OH)4
9.ED.15AmesiteMg2Al(AlSiO5)(OH)4
9.ED.15AntigoriteMg3(Si2O5)(OH)4
9.ED.15Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
9.ED.15Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4
9.ED.15Caryopilite(Mn,Mg)3(Si2O5)(OH)4
9.ED.15ChrysotileMg3(Si2O5)(OH)4
9.ED.15CronstedtiteFe22+Fe3+((Si,Fe3+)2O5)(OH)4
9.ED.15Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4
9.ED.15GreenaliteFe2-3(Si2O5)(OH)4
9.ED.15KellyiteMn22+Al(AlSiO5)(OH)4
9.ED.15LizarditeMg3(Si2O5)(OH)4
9.ED.15ManandoniteLi2Al4(Si2AlB)O10(OH)8
9.ED.15Népouite(Ni,Mg)3(Si2O5)(OH)4
9.ED.15PecoraiteNi3(Si2O5)(OH)4
9.ED.15GuidottiiteMn2Fe3+(Fe3+SiO5)(OH)4
9.ED.20Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
9.ED.20ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O (x < 1)
9.ED.20Neotocite(Mn,Fe,Mg)SiO3 · H2O
9.ED.25BismutoferriteFe23+Bi(SiO4)2(OH)
9.ED.25ChapmaniteFe23+Sb3+(Si2O5)O3(OH)

Other Names for Imogolite

Name in Other Languages:
German:Imogolit
Japanese:芋子石
Spanish:Imogolita

Other Information

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

References for Imogolite

Reference List:
Mineralogical Magazine (1987): 51: 327. [Redefinition]

Clays and Clay Minerals (1994): 42: 276.

Internet Links for Imogolite

Localities for Imogolite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
China
 
  • Fujian Province
    • Xiamen Prefecture
      • Tong'an District
Acta Petrologica et Mineralogica 11(2), 146-156 (1992)
Japan
 
  • Honshu Island
    • Kanto Region
      • Tochigi Prefecture
        • Kanuma City
Alfredo Petrov collection
  • Kyushu Region
    • Kumamoto prefecture
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Russell, J. D., McHardy, W. J., & Fraser, A. R. (1969). Imogolite: a unique aluminosilicate. Clay Miner, 8, 87-99.
USA
 
  • Hawaii
    • Maui Co.
Wada, K. et al (1972) Clays and Clay Minerals; v. 20; no. 6; p. 375-380.
Jan H.Bernard and Jaroslav Hyrsl,2004,Minerals and their Localities,pg # 299
Mineral and/or Locality  
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