oligoclase

noun
ol·​i·​go·​clase | \ ˈä-li-gō-ˌklās How to pronounce oligoclase (audio) , ˈō-, -ˌklāz; ə-ˈli-gə- How to pronounce oligoclase (audio) \

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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