Ijolite is one of the important type of rocks. If we have to define Ijolite in general, Ijolite is an intrusive igneous rock which is composed mainly of nepheline and an alkali pyroxene, usually aegirine-augite. Ijolite comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Ijolite Definition, know more about the History of Ijolite, Etymology of Ijolite in next sections.