Owyhee Jasper from Oregon is a longtime favorite of the lapidary community, having been around for many decades.  A break-away variety is the Owyhee dendritic, or sometimes referred to as Chinese dendritic, displays a splendid array of finely detailed maroon dendrites in a background of pink and yellow jasper.

Origin: Oregon

Dimensions: 2.75" x 2.75" and approximately 7 mm thick.  Weight = 80 grams. 

Shown wet.  Not polished. No known flaws.