n.
Pronunciation: ' o ̇ r-th ə - ˌ kl ā s, - ˌ kl ā z
Function: noun
Etymology: German Orthoklas, from orth- + Greek klasis breaking, from klan to break ― more at CLAST
Date: 1849
: a monoclinic mineral of the feldspar group consisting of a silicate of potassium and aluminum