Kobellite

Kobellite (Pb₂₂Cu₄(Bi,Sb)₃₀S₆₉) is a gray, fibrous, metallic mineral, a sulfide of antimony, bismuth, and lead. It is a member of the izoklakeite - berryite series with silver and iron substituting in the copper site and a vaying ratio of bismuth, antimony, and lead. It crystallizes with orthorhombic dipyramidal crystals. Locations include Hvena, Sweden; Ouray, Colorado; and Wake County, North Carolina, US. Named after Wolfgang Franz von Kobell (1803–1882), German mineralogist.