Quartz is an engineered material that is made of about 90 to 93 percent quartz minerals and about seven to 10 percent resin binder. On the other hand, quartzite is a natural stone material made of quartz mineral-rich sandstone. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.