This matrix specimen is mostly comprised of unusually "untouched", classic, "cogwheel twinned," Bournonite crystals to 2.0 cm across. The crystals have a matte battleship-metal hue and luster to them. This is a classic locality and style but crystals in this quality are rather uncommon and hard to get in good specimens. There are also countless, lustrous, slightly translucent, dark brown Sphalerite crystals present all around. This piece is almost complete with only minor imperfection at the periphery. It is really a significant worldwide Bournonite, I think!