Andesite is one of the important type of rocks. If we have to define Andesite in general, Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava. Andesite comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Andesite Definition, know more about the History of Andesite, Etymology of Andesite in next sections.