Quartz is the second most abundant mineral in Earth’s continental crust, after feldspar. Its crystal structure is a continuous framework of SiO4 silicon–oxygen tetrahedra, with each quartz makes an excellent gemstone. It is hard, durable and usually accepts a brilliant polish.
Quartz is one of the most well-known minerals on earth. Quartz is also the most varied of all minerals, occurring in all different forms, habitats, and colours.