Quartzite doesn't really "morph" into something else in the way that a caterpillar morphs into a butterfly. It's a metamorphic rock, meaning it's already been transformed from something else.

Here's how to think about it:

* Starting Point: Quartzite begins as sandstone, which is made up of sand grains cemented together.

* Transformation: Intense heat and pressure during geological processes (like mountain building) cause the quartz grains in the sandstone to recrystallize and interlock. This forms the hard, dense rock we know as quartzite.

* No Further Metamorphosis: Quartzite is already highly resistant to further changes. It's very stable and doesn't readily transform into something else.

However, there are a few things to note:

* Erosion: Over extremely long periods, even quartzite can be eroded and broken down into smaller fragments. These fragments can then become part of new sedimentary rocks.

* Extreme Conditions: Under extremely high pressure and heat, quartzite might partially melt and recrystallize into a different type of metamorphic rock, such as gneiss or schist. This is unlikely to occur on the Earth's surface.

In short, quartzite is a very stable rock that doesn't "morph" into other rocks easily. Instead, it's the result of the transformation of sandstone.