Schist Rock Facts. Schist is a metamorphic rock that contains flakes of mica. Schist can originate as a sedimentary rock or igneous rock. It can contain different miners. Interesting Schist Rock Facts:Schist and slate are very similar in that they are made from the same rock types except schist is subjected to more heat and pressure.Schist is often referred to as schistosity because of its large mica flakes.chist Rock Facts. Schist is a metamorphic rock that contains flakes of mica. Schist can originate as a sedimentary rock or igneous rock. It can contain different miners. Interesting Schist Rock Facts: