__Quartz__

Quartz, or silica, is a mineral with the chemical formula SiO2. The crystalline structure of quartz is based on a repeating unit called a SiO4 tetrahedron. The arrangement of these tetrahedra in quartz gives it unique physical and chemical properties, such as its hardness and ability to generate an electric charge when subjected to pressure.


Quartz is a crystal with a hexagonal structure commonly found in Earth's crust. The clear and colorful varieties, like amethyst and citrine, are used in jewelry. Quartz also has practical applications in watches and electronics, aiding in timekeeping and electronic circuits.