| Talnakhite | |
|---|---|
 Talnakhite and putoranite | |
| General | |
| Category | Sulfide mineral |
| Formula (repeating unit) | Cu9(Fe, Ni)8S16 |
| IMA symbol | Tlk |
| Strunz classification | 2.CB.10b |
| Crystal system | Isometric |
| Crystal class | Hextetrahedral (43m) H-M symbol: (4 3m) |
| Space group | I4 3m |
| 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. 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. It was officially named "talnakhite" in 1968. 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.
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- Talnakhite: Talnakhite mineral information and data
- 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.
- 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" Archived 2011-10-02 at the Wayback Machine(in Russian)
- 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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