Irridescent purple, blue, and green Chalcopyrite coating Chalcocite. While many of these look like clusters of rod-shaped formations, this specimen reminds me of a tree, with a thick 'trunk' 1.4cm wide that branches out as it goes up (reminds me of an elm tree). There are a few tips missing here and there but overall in good condition. A little larger than most available and much better in person.