as temperature of a rock increases, mafic minerals like olivine will melt before felsic minerals like quartz

as a melt cools, mafic minerals (like olivine) will crystallize out before felsic minerals (like quartz)

as a melt cools, felsic minerals (like quartz) will crystallize out before mafic minerals (like olivine)

as pressure on a rock increases, mafic minerals like olivine will transform into felsic minerals like quartz