a crystalline mineral which contains potassium and belongs to the feldspar group
Also called: jaloallofane
hyalophane in American English
(haiˈæləˌfein, ˈhaiələ-)
noun
Mineralogy
a variety of orthoclase in which some of the potassium is replaced by barium
Word origin
[1850–55; hyalo- + -phane]This word is first recorded in the period 1850–55. Other words that entered Englishat around the same time include: boneyard, clear-cut, heavyweight, muggins, proletariat