Pronunciation: ' a-l ə - ˌ f ā n
Function: noun
Etymology: Greek allophan ē s appearing otherwise, from all- + phainesthai to appear, middle voice of phainein to show ― more at FANCY
Date: circa 1821
: an amorphous translucent mineral of various colors often occurring in incrustations or stalactite forms and consisting of a hydrous aluminum silicate