What igneous rock becomes more mafic but they also become?

As an igneous rock undergoes differentiation, it can become more mafic, meaning it increases in magnesium and iron content. This process often occurs through the crystallization of minerals that are richer in these elements, leading to the formation of rocks such as basalt. Additionally, the remaining melt becomes more felsic as lighter minerals crystallize first and are removed from the melt, resulting in a shift in composition. Thus, the overall trend is towards a more mafic composition for the solidified rock while the residual melt becomes more silica-rich.