Pumice is primarily composed of silica (SiO2), which is the main component of volcanic glass. However, it also contains other minerals, including:

* Feldspar: A group of rock-forming minerals that are often found in pumice.

* Quartz: A hard, crystalline mineral that can also be present in pumice.

* Pyroxene: A group of minerals that are common in volcanic rocks.

* Amphibole: Another group of minerals that are often found in volcanic rocks.

* Olivine: A green mineral that is sometimes present in pumice.

The exact mineral composition of pumice can vary depending on the specific volcano and the conditions under which it formed.