Jasper / Jasper is an opaque variety of Chalcedony. It is usually brown, yellow, or reddish colors, but may also be dark or mottled green, orange, and black. Jasper is almost always multicolored, with unique color patterns and habits, hence its name meaning spotted or speckled stone.
There are an abundance of jasper varieties, each with a unique color or pattern. 
Jasper is believed to be extremely nurturing and useful for controlling emotions and calming nerves.