Banded Quartz is a type of quartz that is characterized by its striped or banded appearance. AGATE, ONYX, and AGATES are all varieties of Banded Quartz. AGATE is a type of quartz that has curved bands of color, while ONYX is a type of quartz with straight bands of color. AGATES are a type of quartz that have both curved and straight bands of color. All three varieties of Banded Quartz are popular for use in jewelry and decorative items.