What is the chemical composition of the metamorphic rock schist?
The chemical composition of individual schist rocks varies according to their mineralogy. For instance, there are talc schists, chlorite schists, mica schists and so on.
Schist is more of a texture versus a color. A schist is a type of metamorphic rock. What makes a rock fit into the schist category is the orientation of the mineral crystals in the rock. They can be most any color. A large portion of them are dark in color being black, grey or greenish because of the minerals that exist under metamorphic conditions.