Dalnegorsk is known for its rich suite of sulfide mineral species, but among them a great, truly great, chalcopyrite is exceedingly uncommon. THIS is a great one! It is a solid cluster of intergrown crystals, weighing about 3 pounds (1200 grams). The patterning is mesmerizing and I suspect it might be twinned. This is a significant display example of the species, from ANY locality, for size and the interesting patterning. It is certainly from old workings here, probably from the early part of modern collecting in the 1970s and 1980s.