|Color||White, blue, green, brown, black|
|Crystal habit||Conchoidal to earthy masses of microscopic threadlike particles and bundles of fine tubes, each about 20 Å in diameter|
|Mohs scale hardness||2-3|
|Luster||Vitreous, resinous, waxy|
|Diaphaneity||Transparent to translucent|
Imogolite is an aluminium silicate clay mineral with formula: Al2SiO3(OH)4. It occurs in soils formed from volcanic ash and was first described in 1962 for an occurrence in Uemura, Kumamoto prefecture, Kyushu Region, Japan. Its name is derived from the Japanese imogo for the brownish yellow soil derived from volcanic ash. It occurs with allophane, quartz, cristobalite, gibbsite, vermiculite and limonite.
- Wada, Koji; Yoshinaga, Naganori (January–February 1969). "The structure of "Imogolite"". The American Mineralogist 54: 50–71. Retrieved 13 March 2012.
- Gabriel, Jean-Christophe P.; Davidson, Patrick (2003). Imogolite: A Natural Nanotube, Aqueous Synthesis, and Composite Materials. "Mineral Liquid Crystals from Self-Assembly of Anisotropic Nanosystems". Top Curr Chem 226: 126–127. (Contains structure illustration)