Minerals such as olivine and pyroxene are relatively "tough" and are the first to crystallize out of a cooling magma.
(Minerals such as olivine and pyroxene; are; relatively "tough) (Minerals such as olivine and pyroxene; are; the first to crystallize out of a cooling magma) (the first; to crystallize; out of a cooling magma)
Minerals such as olivine and pyroxene Minerals such as olivine and pyroxene the first
are are to crystallize
relatively "tough
the first to crystallize out of a cooling magma
out of a cooling magma