So, foliation of phyllites differs from the foliation in slates that stems from clay mineral alignment, and unique from foliation in schists since schists often have visible mica grains. Like slates, phyllites exhibit fissility. A lot of mantle xenoliths, carried up as nodules within magma, are eclogites. Eclogites may also https://www.generationgenius.com/videolessons/rocks-and-minerals-video-for-kids/