Talnakhite

Talnakhite is a mineral of Chalcopyrite Group^[1], also described as olivinic gabbro-dolerite^[2] 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.^[3] It was officially named "talnakhite" in 1968 ^[4][5] 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. ^[6][7]

References

1. ^ [1]
2. ^ [2]
3. ^ 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.
4. ^ Будько И. А., Кулагов Э. А. "Новый минерал талнахит — кубическая разновидность халькопирита", Zapiski Vsesoyuznogo Mineraligicheckogo Obshchestva, 1968. ч. 97, вып. 1, с. 63.
5. ^ "Time to gather stones"(Russian)
6. ^ Cabri L.J., Econ.Geol.(1967) 62, 910-925
7. ^ Michael Fleischner, "New Mineral Names", The American Mineralogist, 1970, vol 55, p. 2135