Essexite is one of the important type of rocks. If we have to define Essexite in general, Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock. Essexite comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Essexite Definition, know more about the History of Essexite , Etymology of Essexite in next sections.