a clay mineral, an amorphous hydrous silicate of aluminum, occurring in blue, green, or yellow, resinous to earthy masses.

1835–45; < Greek allophanḗs, equivalent to allo- allo- + phan- (stem of phaínesthai to appear) + -ēs adj. suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
allophane (ˈæləˌfeɪn)
a variously coloured amorphous mineral consisting of hydrated aluminium silicate and occurring in cracks in some sedimentary rocks
[C19: from Greek allophanēs appearing differently, from allo- + phainesthai to appear]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Allophane is a complex alumino-silicate and is considered to have short-range order or is poorly crystalline.
Oxidative changes of polyphenols as influenced by allophane.
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