No, quartz is not a metamorphic rock. Quartz is actually a mineral, one of the most common minerals found in the Earth’s crust. It is composed of silicon and oxygen atoms in a continuous framework of SiO₄ silicon–oxygen tetrahedra.
Quartz can be found in all types of rocks, including igneous, metamorphic, and sedimentary rocks. However, it is not classified as a metamorphic rock itself. Metamorphic rocks are formed from the transformation of existing rock types, in a process called metamorphism, which means ‘change in form’. This process occurs under extreme heat and pressure, but without melting the rock.
Examples of metamorphic rocks include marble, which forms from limestone, and slate, which forms from shale. Quartz, on the other hand, remains a mineral regardless of the type of rock it is found in.