plagioclase

noun pla·gio·clase \ ˈplā-j(ē-)ə-ˌklās , ˈpla- , -ˌklāz \

Definition of plagioclase

:a triclinic feldspar; especially :one having calcium or sodium in its composition

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Origin and Etymology of plagioclase

Greek plagios oblique + klasis breaking, from klan to break — more at clast


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