Talnakhite

Talnakhite is a mineral of Chalcopyrite Group [ [http://www.mindat.org/min-3877.html Talnakhite: Talnakhite mineral information and data ] ] , also described as olivinic gabbro-dolerite [ [http://geo.web.ru/db/msg.html?mid=1168487 Фбмобийф - Зепмпзйюеулйк Умпчбтш - Чуе П Зепмпзйй (Geo.Web.Ru) ] ] It was named after Talnakh ore deposit, a place by 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.] [http://gazetazp.ru/cgi-bin/showissue.pl?n=1998/188&i=4 "Time to gather stones"] ru icon] 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 80-100 C 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, [http://www.minsocam.org/ammin/AM55/AM55_2135.pdf. p. 2135] ]

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