Quartz is the mineral that is primarily made up of silicon dioxide (SiO2). This common and abundant mineral can be found in many different geological environments and is a major component of many types of rocks, including igneous, metamorphic, and sedimentary. Quartz is prized for its hardness, durability, and its crystalline structure, which can be found in a wide range of colors. It is also highly valued in the jewelry industry and for industrial applications. Additionally, quartz is used in electronics because of its piezoelectric properties, making it integral to many technologies.