Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An amorphous hydrous aluminium silicate clay mineral.

from The Century Dictionary and Cyclopedia

  • n. A mineral of a pale-blue, and sometimes of a green or brown, color.

Etymologies

From Greek allophanēs, appearing otherwise : allos, other; see allo- + phainesthai, phan-, to appear, passive of phainein, to show; see fantasy.
(American Heritage® Dictionary of the English Language, Fourth Edition)
allo- +‎ phane (Wiktionary)

Examples

  • Volcanic deposits have a unique process of weathering that causes the accumulation of allophane and oxides of iron and aluminum in developing soils.

    Soil

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