Pumice is one of the important type of rocks. If we have to define Pumice in general, Pumice is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals. Pumice comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Pumice Definition, know more about the History of Pumice, Etymology of Pumice in next sections.