As a result, foliation of phyllites differs from the foliation in slates that stems from clay mineral alignment, and distinct from foliation in schists since schists often consist of seen mica grains. Like slates, phyllites show fissility. (Figure eight.seventy four) are significantly less popular and form exclusively at low pressures https://www.generationgenius.com/videolessons/rocks-and-minerals-video-for-kids/