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orthoclase

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noun or·tho·clase \ˈȯr-thə-ˌklās, -ˌklāz\

Definition of orthoclase

  1. :  a monoclinic mineral of the feldspar group consisting of a silicate of potassium and aluminum



Origin and Etymology of orthoclase

German Orthoklas, from orth- + Greek klasis breaking, from klan to break — more at clast


First Known Use: 1849


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