What Minerals Make up Pumice?

What Minerals Make up Pumice?

Pumice is an igneous rock that can be made up of various minerals such as feldspar, hornblende, augite and zircon. It is a light-colored rock that forms during a volcanic eruption.

Pumice is a mineraloid, an amorphous volcanic glass. Most pumice stones have a rhyolitic composition, though they can have a basaltic or andestic composition.

The vesicles or pores in pumice are created by gas bubbles that were trapped during the rapid cooling of frothy magma. Pumice has a low specific gravity giving it the ability to float on water. It is used in concrete blocks, to make them lighter, and in creating stone-washed denim, pencil erasers, and cat litter.