oligoclase

noun
ol·i·go·clase | \ˈä-li-gō-ˌklās, ˈō-, -ˌklāz;ə-ˈli-gə- \

Definition of oligoclase 

: a mineral of the plagioclase series

First Known Use of oligoclase

1832, in the meaning defined above

History and Etymology for oligoclase

German Oligoklas, from olig- olig- + Greek klasis breaking, from klan to break — more at clast

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The first known use of oligoclase was in 1832

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