Tonalite is one of the important type of rocks. If we have to define Tonalite in general, Tonalite is a coarse-grained plutonic rock consisting mainly of sodic plagioclase, quartz, and hornblende or other mafic minerals with phaneritic texture. Tonalite comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Tonalite Definition, know more about the History of Tonalite, Etymology of Tonalite in next sections.