Jasper is an opaque form of Chalcedony. Chalcedony is a term that is used to describe a wide variety of quartz. Other forms of Chalcedony include Agate, Bloodstone, Carnelian, and Chrysoprase.
The Red Jasper above shows one of the many color combinations you might find in a piece of Jasper. Jasper is commonly used to make jewelry and looks very attractive when polished.
Other varieties of Jasper include Ocean Jasper and Yellow Jasper.