Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy An amorphous hydrous aluminium silicate clay mineral.

Etymologies

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

[From Greek allophanēs, appearing otherwise : allos, other; see allo– + phainesthai, phan-, to appear, passive of phainein, to show; see bhā- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

allo- +‎ phane

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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