Sometimes erroneously called Mushroom Jasper, this is actually a type of thunderegg, and probably Arizona's most beautiful and famous thunderegg. The cores are usually quartz but it is the amazing matrix, pale and sketched with reds and browns, that makes this so special. Because of their extremely free-form shapes, often just a conglomerate of blobs of matrix and crystal, this is quite commonly used for carving and cabbing, rather less often seen as whole specimens. Both of these here are quite uncharacteristically intact and structured for this location.