plagioclase
pla·gio·clase
noun\ˈplā-j(ē-)ə-ˌklās, ˈpla-, -ˌklāz\
Definition of PLAGIOCLASE
: a triclinic feldspar; especially : one having calcium or sodium in its composition
Origin of PLAGIOCLASE
Greek plagios oblique + klasis breaking, from klan to break — more at clast
First Known Use: circa 1868
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