Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary


noun al·lo·phane \ˈa-lə-ˌfān\

Definition of allophane

  1. :  an amorphous translucent mineral of various colors often occurring in incrustations or stalactite forms and consisting of a hydrous aluminum silicate

Origin and Etymology of allophane

Greek allophanēs appearing otherwise, from all- + phainesthai to appear, middle voice of phainein to show — more at fancy

First Known Use: circa 1821

Learn More about allophane

Seen and Heard

What made you want to look up allophane? Please tell us where you read or heard it (including the quote, if possible).