Granulite is one of the important type of rocks. If we have to define Granulite in general, Granulite is fine to medium grained metamorphic rock with a granular of polygonal crystals.. Granulite comes under Metamorphic Rocks. All Metamorphic Rocks have similar properties and formation process. Along with Granulite Definition, know more about the History of Granulite, Etymology of Granulite in next sections.