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Giessenite: Pb13(Cu,Ag)(Bi,Sb)9S28 (?)
Comments: Small clumps of acicular crystal mats of giessenite with rounded cosalite grains (as photographed on pure white fibrous backing material). Location: Otome Mine, near Kofu, Yamanashi, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species