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 . 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.