Talnakhite

{{Infobox mineral | name = Talnakhite | image = Putoranite, Talnakhite - Mineralogisches Museum Bonn3.jpg | imagesize = 260px | alt = | caption = Talnakhite and putoranite | category = Sulfide mineral | formula = Cu₉(Fe, Ni)₈S₁₆ | IMAsymbol = Tlk<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> | molweight = | strunz = 2.CB.10b | system = Isometric | class = Hextetrahedral ({{Overline|4}}3m) <br/>H-M symbol: ({{Overline|4}} 3m) | symmetry = ''I''{{Overline|4}} 3m | unit cell = | color = Brass-yellow, tarnishes to pink or brown tints, then iridescent | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | mohs = | luster = Metallic | streak = | diaphaneity = Opaque | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }}

'''Talnakhite''' is a mineral of chalcopyrite group with formula: Cu₉(Fe, Ni)₈S₁₆.<ref>[http://www.mindat.org/min-3877.html Talnakhite: Talnakhite mineral information and data<!-- Bot generated title -->]</ref> 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.<ref>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&mdash;410.</ref> It was officially named "talnakhite" in 1968.<ref>Будько И. А., Кулагов Э. А. "Новый минерал талнахит — кубическая разновидность халькопирита", Zapiski Vsesoyuznogo Mineraligicheckogo Obshchestva, 1968. ч. 97, вып. 1, с. 63.</ref><ref name=gather>[http://gazetazp.ru/cgi-bin/showissue.pl?n=1998/188&i=4 "Time to gather stones"] {{Webarchive|url=https://web.archive.org/web/20111002180219/http://gazetazp.ru/cgi-bin/showissue.pl?n=1998%2F188&i=4 |date=2011-10-02 }}{{in lang|ru}}</ref> 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 {{convert|80|°C|°F}} to {{convert|100|°C|°F}} it decomposes to tetragonal cubanite plus bornite.<ref>Cabri L.J., Econ.Geol.(1967) 62, 910-925</ref><ref>Michael Fleischner, "New Mineral Names", ''The American Mineralogist,'' 1970, vol 55, [http://www.minsocam.org/ammin/AM55/AM55_2135.pdf p. 2135]</ref>

==References== {{reflist}}

Category:Copper(I,II) minerals Category:Sulfide minerals Category:Iron minerals Category:Nickel minerals Category:Cubic minerals Category:Minerals in space group 217

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