ex. Robert Rich Collection This unusual specimen hosts both stereotypical spaceship-like disc-like crystals of chalcocite at the bottom, and also several unusual large and striated crystals rising above! In person, it is much more dramatic, and the "V" shape you see in the middle is probably indicative of twinning between the two main crystals, rising vertically from the base. A most unusual piece, very aesthetic, and more 3-dimensional in person.