Felsite is one of the important type of rocks. If we have to define Felsite in general, Felsite is a very fine grained volcanic rock that may or may not contain larger crystals and light colored rock that typically requires petrographic examination or chemical analysis for more precise definition. Felsite comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Felsite Definition, know more about the History of Felsite, Etymology of Felsite in next sections.