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talnakhite
Talnakhite is a mineral of chalcopyrite group with formula: Cu9(Fe, Ni)8S16.〔(Talnakhite: Talnakhite mineral information and data )〕 It was named after the Talnakh ore deposit, near Norilsk in Western Siberia, Russia where it was discovered as reported in 1963 by I. Budko and E. Kulagov.〔Ivetta Budko, Eduard Kulagov, "A Natural Cubic Chalcopyrite" (Будько И.А., Кулагов Э.А., "Природный кубический халькопирит"), Докл. АН АН СССР. (1963) vol. 152, no. 2, pp. 408—410.〕 It was officially named "talnakhite" in 1968.〔Будько И. А., Кулагов Э. А. "Новый минерал талнахит — кубическая разновидность халькопирита", Zapiski Vsesoyuznogo Mineraligicheckogo Obshchestva, 1968. ч. 97, вып. 1, с. 63.〕〔("Time to gather stones" )〕 Despite the initial announcement it turned out to be not a face centered high-temperature polymorph of chalcopyrite, but to have composition Cu18(Fe, Ni)18S32. At to it decomposes to tetragonal cubanite plus bornite.〔Cabri L.J., Econ.Geol.(1967) 62, 910-925〕〔Michael Fleischner, "New Mineral Names", ''The American Mineralogist,'' 1970, vol 55, (p. 2135 )〕
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