I can’t believe I FORGOT to put this one on the website – the most important thunderegg from Arizona! Gawd I am hopeless! These have been on my shelf for a long time and I might even have shared one on the blog before – but now I have finally put them where they belong on the gallery! 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 and pockets 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.