Pumice is not made of individual minerals. Instead, it's a volcanic glass, which is formed when lava cools so rapidly that crystals don't have time to form. This glass is then filled with gas bubbles trapped within the lava during its eruption.

However, pumice can contain inclusions of various minerals that were present in the original lava. These minerals can include:

* Feldspar (various types)

* Quartz

* Pyroxene

* Olivine

* Magnetite

* Ilmenite

The specific minerals present in pumice will depend on the chemical composition of the lava from which it was formed.