The second most abundant mineral in the earth’s crust, quartz, is an igneous rock consisting of one part silicon and two parts oxygen. There is a wide variety of quartz types, some of which are semi-precious stones such as rose quartz, smoky quartz, yellow citrine, amethyst, beryl, chalcedony, and many others. Cut, polished, and tumbled quartz stones are broadly used for jewelry. It is favored for its versatility and affordability.
