The formula of quartz is as follows: SiO2 (Silicon and Oxygen). It is an oxide, with varying colors from colorless through a range of colors all the way to black. It has a Vitreous luster, and can be transparent to nearly opaque. It's melting point is from 1670 °C to 1713 °C. It is part of the trigonal crystal system. It's very common in sedimentary rocks such as sandstone and shale. These are just some common quartz facts. Have a good day!