First Known Use: 1849
Dictionary
orthoclase
noun or·tho·clase \ˈȯr-thə-ˌklās, -ˌklāz\
Definition of ORTHOCLASE
: a monoclinic mineral of the feldspar group consisting of a silicate of potassium and aluminum
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Origin of ORTHOCLASE
German Orthoklas, from orth- + Greek klasis breaking, from klan to break — more at clast
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