Talnakhite

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Talnakhite

Talnakhite and putoranite
General
Category Sulfide mineral
Formula
(repeating unit)		 Cu9(Fe, Ni)8S16
Strunz classification 02.CB.10b
Identification
Color Brass-yellow, tarnishes to pink or brown tints, then iridescent
Luster Metallic
Diaphaneity Opaque

Talnakhite is a mineral of chalcopyrite group with formula: Cu9(Fe, Ni)8S16.[1] 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.[2] It was officially named "talnakhite" in 1968.[3][4] 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 °C (176 °F) to 100 °C (212 °F) it decomposes to tetragonal cubanite plus bornite.[5][6]

References

  1. ↑ Talnakhite: Talnakhite mineral information and data
  2. ↑ 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.
  3. ↑ Будько И. А., Кулагов Э. А. "Новый минерал талнахит — кубическая разновидность халькопирита", Zapiski Vsesoyuznogo Mineraligicheckogo Obshchestva, 1968. ч. 97, вып. 1, с. 63.
  4. ↑ "Time to gather stones"(Russian)
  5. ↑ Cabri L.J., Econ.Geol.(1967) 62, 910-925
  6. ↑ 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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