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Imogolite

Phyllosilicate clay mineral

Field	Value
name	Imogolite
image	Imogolite soil.jpg
caption	Imogolite soil (brown) with fragments of transparent imogolite films
category	Phyllosilicate minerals
formula
IMAsymbol	Imo
strunz	9.ED.20
system	Tetragonal
Unknown space group
color	White, blue, green, brown, black
habit	Conchoidal to earthy masses of microscopic threadlike particles and bundles of fine tubes, each about 20 Å in diameter
mohs	2–3
luster	Vitreous, resinous, waxy
diaphaneity	Transparent to translucent
gravity	2.7
opticalprop	Isotropic
refractive	n=1.47–1.51
references

Unknown space group | length fast/slow = Imogolite is an aluminium silicate clay mineral with the chemical formula . 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 originates from the Japanese word ja, which refers to the brownish yellow soil derived from volcanic ash. It occurs together with allophane, quartz, cristobalite, gibbsite, vermiculite and limonite.

Imogolite consists of a network of nanotubes with an outer diameter of ca. 2 nm and an inner diameter of ca. 1 nm. The tube walls are formed by continuous (gibbsite) sheets and orthosilicate anions ( groups). Owing to its tubular structure, natural availability, and low toxicity, imogolite has potential applications in polymer composites, fuel gas storage, absorbents, and as a catalyst support in chemical catalysis.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
"Imogolite Mineral Data".
"Imogolite: Mineral information, data and localities". [[Hudson Institute of Mineralogy]].
(1995). "Handbook of Mineralogy". [[Mineralogical Society of America]].
(2010). "Imogolite Reinforced Nanocomposites: Multifaceted Green Materials". [[Materials (journal).

Info: Wikipedia Source

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aluminium-minerals pedology phyllosilicates soil tetragonal-minerals volcanic-soils

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