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

First Known Use of orthoclase

1849, in the meaning defined above

History and Etymology for orthoclase

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

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The first known use of orthoclase was in 1849

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Britannica.com: Encyclopedia article about orthoclase

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