Willow Creek Jasper is one of the finest ad most prized porcelain jaspers. It is mined near Eagle, Idaho. The jasper forms in the center of thunder eggs (concretions) that form within rhyolite volcanic ash. High quality willow creek jasper is hard to find. As described by Philip Stevenson, good quality Willow Creek jasper will not have iron pits or stains. I have only selected slabs that do not have these iron pits.
If you like this material, you may also like monet jasper or wave dolomite.