There are many different habits seen in the Descoizites of Berg Aukus, which is certainly the premier locale for this mineral. This specimen has a rounded series of crystal aggregates that present curved faces and a colorful patina. The iridescence is most striking and at first glance this looks like a fine Chalcocite. Undamaged, pristine condition, and crystalized all around, the underside is a hollow cup holding more traditional forms of small bright red Descloizite crystals. We have handled and seen many fine Berg Aukus specimens but this piece is unique in my experience. Ex William Hladysz collection, his catalog notes "very rare habit, unlike any other".