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HONGSHIITE, PtCu, FROM ITABIRITE-HOSTED Au–Pd–Pt MINERALIZATION (JACUTINGA), ITABIRA DISTRICT, MINAS GERAIS, BRAZIL

Rogerio Kwitko^1,, Alexandre R. Cabral^2,, Bernd Lehmann², J.H. Gilles Laflamme³, Louis J. Cabri³, Alan J. Criddle⁴ and Henry F. Galbiatti⁵

¹ Centro de Desenvolvimento Mineral, Companhia Vale do Rio Doce, BR 262/km 296, 33030-970 Santa Luzia – MG, Brazil
² Institut für Mineralogie und Mineralische Rohstoffe, Technische Universität Clausthal, Adolph-Roemer-Str. 2A, D-38678 Clausthal-Zellerfeld, Germany
³ Canada Centre for Mineral and Energy Technology, 555 Booth Street, Ottawa, Ontario K1A 0G1, Canada
⁴ Mineral Science and Systematics Division, Department of Mineralogy, The Natural History Museum, London SW7 5BD, U.K.
⁵ Diretoria de Ferrosos Sul, Companhia Vale do Rio Doce, 35900-900 Itabira-MG, Brazil

E-mail addresses: kwitko{at}cvrd.com.br, cabral{at}min.tu-clausthal.de

Hongshiite occurs associated with palladian gold, and more rarely with native platinum, in the sulfide-free, hematite-rich jacutinga mineralization of the Quadrilátero Ferrífero, central Minas Gerais, Brazil. Hongshiite occurs in grains up to about 1.5 mm in cross-section. The crystals (>0.1 mm) are generally covered by a porous rim from which copper is preferentially leached, eventually forming a rind of nearly pure native platinum. The morphological and chemical features of hongshiite are similar to features caused by the weathering of primary gold in a lateritic environment. Submicrometer-sized crystals, acicular in shape, replace an octahedral precursor phase, interpreted to be magnetite. The magnetite could have acted as a local redox barrier to the passage of oxidizing hydrothermal fluids leading to hongshiite precipitation. Sperrylite, isomertieite, atheneite, sudovikovite, a "guanglinite"-like phase, an undefined copper selenide, and barite occur as euhedral to anhedral inclusions in the larger crystals of hongshiite. Patches of a Au–Cu–Pt alloy within hongshiite have a composition nearly intermediate between tetra-auricupride and hongshiite, and could be called platinian tetra-auricupride, suggesting an extension of a solid solution toward hongshiite. The presence of tiny rosette-like crystals of native palladium in the auriferous jacutinga mineralization is also documented.

Keywords: hongshiite, sudovikovite, platinum-group minerals, palladium rosettes, Au-Pd-Pt jacutinga mineralization, Itabira Iron Formation, Quadrilátero Ferrífero, Minas Gerais, Brazil.

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