Kobellite

Kobellite (Pb22Cu4(Bi,Sb)30S69) is a gray, fibrous, metallic mineral, bismuth. It is a member of the izoklakeite and iron site and a varying ratio of bismuth, antimony, and lead. It crystallizes with monoclinic pyramidal crystals. The mineral can be found in ores and deposits of Hvena, Sweden; and Wake County, North Carolina, US. The mineral was named after Wolfgang Franz von Kobell (1803–1882), a German mineralogist.