What Is Quartz And How Are Quartz Countertops Made?April 18, 2016You may be a bit confused in that there are granite countertops and quartz countertops. As discussed above, granite is a type of rock that is partially composed of quartz, a mineral. Therefore, what exactly is a quartz countertop? You may initially think that a quartz countertop would be composed of a quartz arenite, a rock made up of at least 90% quartz. This may remind you of a white sandy beach with a few brown and pink specs. The natural sorting of quartz on beaches is driven by mineral strength and their differential weathering rates. As weaker minerals weather and erode relatively quicker than quartz. Macostone supply different styles Quartz Stone and Quartz Stone Countertop for you.