Trachyte is one of the important type of rocks. If we have to define Trachyte in general, Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar. Trachyte comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Trachyte Definition, know more about the History of Trachyte, Etymology of Trachyte in next sections.