Troctolite is one of the important type of rocks. If we have to define Troctolite in general, Troctolite is a mafic intrusive rock type. It consists essentially of major but variable amounts of olivine and calcic plagioclase along with minor pyroxene. It is an olivine-rich anorthosite, or a pyroxene-depleted relative of gabbro. Troctolite comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Troctolite Definition, know more about the History of Troctolite, Etymology of Troctolite in next sections.