Greenschist is one of the important type of rocks. If we have to define Greenschist in general, Greenschist is a metamorphic rock that is formed under lowest temperatures and pressures and is usually produced by regional metamorphism. Greenschist comes under Metamorphic Rocks. All Metamorphic Rocks have similar properties and formation process. Along with Greenschist Definition, know more about the History of Greenschist, Etymology of Greenschist in next sections.