Theralite is one of the important type of rocks. If we have to define Theralite in general, Theralite is a plutonic hylocrystalline igneous rock consisting of augite, olivine, calcic plagioclase and nepheline. Theralite comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Theralite Definition, know more about the History of Theralite, Etymology of Theralite in next sections.