Porosity

Pumice: Igneous rock with very high porosity. Image Source: Getty Images.

The volume percentage of a rock that consists of void space. Vesicular porosity is a type of porosity resulting from the presence of vesicles, or gas bubbles, in igneous rock such as the pumice presented here. Vesicular porosity is very rare in meteorites and is often associated with slag, one of the most common meteorwrongs.