Pumice is lighter as a result of air blended in it, when lava rock is denser. Lava rock also has bigger vesicles and thicker vesicle walls than pumice.Scoria is a little grain of red lava. It are available coarsely or finely milled, like sand. It's fashioned in basaltic magma, which means that it emanates from lava which is flowing. It's really a v