Willow Creek Jasper is found in a small area northwest of Boise in Idaho . The jasper is filling here the center of  gigantic thundereggs. The largest of them are reaching a diameter of 3 m with a length of 5 m. In the mine of Larry Ridley (he claimed all the occurences of this fine type of jasper)  the jasper in good comercial quality is found usually in the large thundereggs. - in such a way J. Zenz writes in its book agates III, Bode publishing house 2011: “… however once a good “egg” is opened 50 - 100 kg of fine jasper can be extracted”. The many thousand small Thundereggs are not used, since the jasper is too unequally distributed in them and constitutes only a small percentage of the volume of the thundereggs. This Jaspis is very estimated in the USA, because it shows variety of most different pattern - flowing structures, rhythmic repetitions of form and also the demanded “Egg -Shell-Pattern”. Also its harmonic pastels make it covetable. At last the materialis polishable in an excellent way.

Phillip Stevenson shows us on his website rarerockandgems.com different quality categories of Willow Creek Jasper and pictures of the locations.

Hans Gamma is showing on his website worldofjaspers.com fantastic specimens of this location.