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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.]


(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]


(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]
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References in periodicals archive ?
Kodama and Ross (1991) showed that the amounts of allophane, imogolite and weakly crystalline Fe oxides extracted by Tiron arc similar to those extracted by ammonium oxalate solution (Tamm 1932; modified by Schwertmann 1964).
2003), whereas allophane soil derived from volcanic ash is dispersed under high pH conditions (Wada 1985; Horikawa et al.
However, orthopyroxene, olivine and mangnetite were also detected in contaminated soils including allophane and quartz (Table 2).
The fact that the soil samples consists mostly of poorly crystalline allophane and /or halloysite clays plus beta quartz with no ma.
Fieldes M, Perrott K (1966) The nature of allophane in soils Part 3.
In these soils, the short-range-order mineral allophane can also be found (Wada 1989).
3]-N, Br and Cl can also be adsorbed in volcanic materials containing allophane (Parfitt 1980).
Allophane present in soils was determined according to the method of Parfitt and Wilson (1985) and Parfitt (1986).
Several of the soils in this study are derived from volcanic ash and do not have significant amounts of crystalline aluminosilicates, but instead consist of allophane, which are clay-sized, short-range ordered aluminosilicates associated with the weathering of volcanic ashes and glasses.
This was to avoid using oven-dried material from the core, because allophane clay changes density slightly on drying.