Mineral name (Click for german version) Bartelkeite   Hölzel-No.   4.CK.100 Type of specimen   HT IMA-No. / Accepted   79-29 / 1979 Chemical formula   PbFe3+Ge3O8 Type locality   Namibia, Tsumeb, Tsumeb mine Associated minerals   Germanite, renierite, tennantite, galena, chalcocite, quartz, wulfenite Depot   Archiv der Universität Stuttgart, „Mineralogische Sammlung Prof. Keller” Contact person   Prof. Dr. P. Keller Catalogue−No. / Site   TM-79.29-Tn / 0/824-s27/2 Nature of type specimen   Mineral specimen, 9 x 7 x 3 mm. Single crystals in a glass capillary References Bartelkeit, PbFe3+Ge3O8, ein neues Germaniummineral von Tsumeb, Namibia. Keller, P., Hess, H.. & Dunn, P.J. (1981) Chemie der Erde, 40 201-206 Notes / Further information Named after Dr. Wolfgang Bartelke, Mainz, Germany. Dr. Bartelke has collected the material and provided it for examination.