What Is the Texture of Pumice Rock?

Pumice rock has a eutaxitic texture characterized by a frothy, glassy vesicular surface that makes the volcanic rock extremely porous. The presence of numerous gas bubble perforations enables pumice to float on water.

Igneous rocks comprise one of the three prominent types of rock formations. They are formed when hot molten material called magma, rises from the semi-fluid mantle or lower crust. The magma eventually cools down and either solidify on Earth's surface or within the crust.

Igneous rocks are broadly categorized into two types: volcanic and plutonic. Volcanic rocks form on the surface from magma that underwent rapid cooling. Crystallization does not occur in volcanic rocks, which are typically fine-grained. The presence of flow banding and vesicles, or air sacs, is also evident on the surface of volcanic rocks. These types of rocks are generally identified based on their textures, which can either be aphanitic and eutaxitic. One of the most commonly occurring volcanic rock with a eutaxitic texture is pumice.

Pumice is a low-density, grayish mineraloid that is often likened to the consistency of a glass foam. The eutaxitic texture of pumice is distinguished by a flat surface containing thin sheets of pumice clasts within a compact lenticular configuration of sintered ash. This type of texture forms through explosive volcanic activity.