Science / Geology / Schist: A metamorphic rock containing abundant particles of mica, characterized by strong foliation, and originating from a metamorphism in which directed pressure plays a significant role. Picture of Schist.
Science / Geology / Greenschist: A metamorphic schist containing chlorite and epidote (which are green) and formed by low-temperature, low-pressure metamorphism. MORE
Science / Geology / Schistosity: The parallel arrangement of platy or prismatic minerals in a rock that is caused by metamorphism in which directed pressure plays a significant role. MORE
Science / Geology / Phyllite: A foliate metamorphic rock that is made up mainly of very fine-grained mica. The surface of phyllite is typically lustrous and sometimes wrinkled. It is intermediate in grade between slate and schist. MORE