Rhyodacite is one of the important type of rocks. If we have to define Rhyodacite in general, Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite. Rhyodacite comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Rhyodacite Definition, know more about the History of Rhyodacite, Etymology of Rhyodacite in next sections.