Here's why:

* Quartzite is a metamorphic rock. It forms when sandstone (a sedimentary rock) is subjected to intense heat and pressure.

* Igneous rocks form from the cooling and solidification of molten rock (magma or lava). This is a completely different process than the transformation of sandstone into quartzite.

So, quartzite and igneous rocks are formed through entirely different processes and cannot transform into each other.