What is the main difference between quartz and quartzite?

The main difference between quartz and quartzite is that quartz is a man-made material that is raw quartz with resin that they are able to press together and create a pattern that is consistent from slab to slab. Quartzite, on the other hand, is a natural stone that comes out of the earth and is made from a hardened metamorphic rock. Additionally, because pigment can be added to quartz, the variety of colors available is greater than the typical white to gray scale of quartzite.