a soft clay mineral, a translucent, hydrous silicate of aluminum, of varying composition and color, typically occurring as incrustations in chalk and sandstone
Origin of allophaneallo- + -phane, as in Classical Greek allophan?s, appearing otherwise: so named because it changes appearance under the blowpipe
An amorphous, translucent, variously colored mineral, essentially hydrous aluminum silicate.
Origin of allophaneFrom Greek allophan&emacron;s, appearing otherwise : allos, other; see allo– + phainesthai, phan-, to appear, passive of phainein, to show; see bha-1 in Indo-European roots.
(countable and uncountable, plural allophanes)
allo- + phane