Serpentinite is one of the important type of rocks. If we have to define Serpentinite in general, A hydration and metamorphic transformation of ultramafic rock from the Earth's mantle is called as serpentinization, a group of minerals is formed by serpentinization compose rock 'serpentinite'.. Serpentinite comes under Metamorphic Rocks. All Metamorphic Rocks have similar properties and formation process. Along with Serpentinite Definition, know more about the History of Serpentinite, Etymology of Serpentinite in next sections.