Quartz is a common mineral made up of silicon and oxygen, forming the chemical compound SiO2. It is one of the most abundant minerals in the Earth's crust and can be found in various colors and forms, including clear, smoky, and rose quartz. Quartz is known for its hardness and durability, making it a popular choice for jewelry and decorative items. In addition to its aesthetic uses, quartz has practical applications in technology. It is used in the production of glass, electronics, and watches due to its piezoelectric properties, which allow it to generate an electric charge when subjected to mechanical stress.