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An amorphous, translucent, variously colored mineral, essentially hydrous aluminum silicate.

[From Greek allophanēs, appearing otherwise : allos, other; see allo- + phainesthai, phan-, to appear, passive of phainein, to show; see bhā- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Minerals) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈæl əˌfeɪn)

a clay mineral, an amorphous hydrous silicate of aluminum, occurring in blue, green, or yellow, resinous to earthy masses.
[1835–45; < Greek allophanḗs appearing otherwie]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
'Units' of allophane can interact with each other and with other soil constituents, resulting in the formation of stable and porous aggregates (Wada 1977).
Weathered biotite (WB), i.e., partially vermiculitized biotite, adsorbed [sup.137]Cs far more tightly than did the other clay minerals (fresh biotite, illite, smectite, kaolinite, halloysite, allophane, and imogolite).
The formation of crystals in volcanic ash is due to the abundance of short-range minerals among the main nanoscale materials, including imogolite (tubular nanotubes), allophane (nanospheres), ferrihydrite, and iron-humic complexes [6].
In fact, it is a flat coating of a blue color caused by overflowing allophane.
This transparent gel formation is employed as the method of confirmation in imogolite synthesis as well as the turbidity measurement, since other by-products such as allophane do not form the gel [8, 9].
Suzuki, "Absorption properties and application of allophane and imogolite," Journal of Clay Science Society of Japan, vol.
The key ingredient: allophane, a micro-porous natural clay.
2003), whereas allophane soil derived from volcanic ash is dispersed under high pH conditions (Wada 1985; Horikawa et al.