The name Agate is associated with the Achates River of Sicily, now known as the Dirillo River. Agate was utilized by ancient Greeks and Romans for decorative carving and arts, and examples from that time are still extant.
Agate is a variety of chalcedony, which is itself a form of quartz. Agate displays distinct banded patterns, and responds well to various dye treatments. There are a multitude of agate varieties specific to locations all over the world.