an·​or·​tho·​clase | \əˈnȯrthəˌklās, -āz\
plural -s

Definition of anorthoclase 

: a feldspar of chiefly sodium potassium aluminum silicate that is closely related to orthoclase but triclinic

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First Known Use of anorthoclase

1888, in the meaning defined above

History and Etymology for anorthoclase

International Scientific Vocabulary an- + orthoclase; originally formed as German anorthoklase

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The first known use of anorthoclase was in 1888

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to express warning or disapproval

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