Chrysoprase is green Chalcedony, which is a variety of fibrous cryptocrystalline Quartz.
See our Chalcedony information page.
There many named varieties of chalcedony, most are based on a specific color like the green chrysoprase or or the orange-red carnelian, while some are based on a specific pattern within the chalcedony like agate which is simply chalcedony with banding or layers.
See all of our natural quartz varieties: