Allophane is an amorphous to poorly crystalline hydrous aluminium silicate clay mineraloid. Its chemical formula is Al2O3·(SiO2)1.3-2·(2.5-3)H2O. Since it has short-range atomic order, it is a mineraloid, rather than a mineral, and can be identified by its distinctive infrared spectrum and its X-ray diffraction pattern. It was first described in...
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http://en.wikipedia.org/wiki/Allophane
(from the article `clay mineral`) Imogolite is an aluminosilicate with an approximate composition of SiO2 Al2O3 2.5H2O. This mineral was discovered in 1962 in a soil derived from ...
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http://www.britannica.com/eb/a-z/a/50
Hydrated aluminosilicate substance ordinarily found associated with clay minerals.
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http://www.physicalgeography.net/physgeoglos/a.html
Allophane is a mixture of minerals bound together in a gel and found in cavities and fissures in metal-bearing ore veins and in some coal deposits. Often
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http://www.probertencyclopaedia.com/browse/HA.HTM
allophane 1. An amorphous clay mineral having a variable composition of aluminum silicate, hydrated water, and traces of other minerals. 2. An amorphous, variously colored, hydrated aluminosilicate mineral.
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a clay mineral, an amorphous hydrous silicate of aluminum, occurring in blue, green, or yellow, resinous to earthy masses.
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https://www.infoplease.com/dictionary/allophane
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