Discovery of Falkmanite from the Bairendaba Superlarge Ag-Pb-Zn Polymetallic Deposit, Inner Mongolia and Its Origin Significance

• 责任者：Liu Jiajun (State Key Laboratory of Geological Processes and Mineral Resources ; School of Earth Science and Resource ; China University of Geosciences ; Beijing 100083 ; China) ; Xing Yongliang
• 刊名：Journal of Jilin University
• 出版年：2010
• 卷期：40(3)
• 关键词：板硫锑铅矿 ; semseyite ; 铅锌矿床 ; lead-zinc deposit ; 银矿 ; silver ores ; 内蒙古 ; Inner Mongolia
• 页码：p.565-572
• 图表：4 illus., 2 tables, 19 refs.
• 分类号：1001
• issnNo：ISSN1671-5888
• isbnNo：CN22-1343/P

///There occurs falkmanite in the Bairendaba superlarge Ag-Pb-Zn polymetallic deposit in Inner Mongolia, China. It is intimately accompanied by galenite, Ag-tetrahedrite, pyrrhotite, chalcopyrite, and boulangerite. Falkmanite crystals show as needle, pillar, prismatic, hair-like, bunchiness and anhedral grain forms, and its grain sizes commonly vary from 0.05 to 4 mm, even to 12 mm. The mineral is lightly grey-white in color, metallic in lustur and brashy, 93.25 to 127.39 kg/mm², averaging 111.05 kg/mm for 100 g load in microhardness and Moh’s=3.06～3.40.  The crystals are monoclinic, with cell dimensions a 2.156, b 2.349, c 0.810 nm. The formation of falkmanite would be favored by a low temperature, increasing f S₂ and reduced fluid conditions during polymetallic mineralization.