Peridotite is one of the important type of rocks. If we have to define Peridotite in general, Peridotite is a dense, coarse-grained plutonic is the main constituent of the earth's mantle. Peridotite comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Peridotite Definition, know more about the History of Peridotite, Etymology of Peridotite in next sections.