A very rare , QUALITY, AESTHETIC cluster of undamaged, lustrous, brassy Pyrite blades that are pseudomorphed after Marcasite crystals. Some of these blades reach up to 4 cm across, and they uniformly have an excellent metallic luster. The surfaces of the pseudomorphs have fine parallel faces, almost strip-like, and some even create the appearance of an orthogonal, woven pattern. The Nanisivik Iron Mine on Baffin Island, Canada, north of the Arctic Circle, is famous for these crystals, among other specimens. This excellent, aesthetic piece has multiple display possibilities, and is much better in person, even. These are 20 years old now - they had to helicopter these out ! I saw them come out through a few mine geologists in the 1990s, and few good specimens had this kind of size or presence to them. This is one of the best I know of.