Talnakhite | |
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![]() Talnakhite and
putoranite | |
General | |
Category | Sulfide mineral |
Formula (repeating unit) | Cu9(Fe, Ni)8S16 |
IMA symbol | Tlk [1] |
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. [2] 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. [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 °C (176 °F) to 100 °C (212 °F) it decomposes to tetragonal cubanite plus bornite. [6] [7]
Talnakhite | |
---|---|
![]() Talnakhite and
putoranite | |
General | |
Category | Sulfide mineral |
Formula (repeating unit) | Cu9(Fe, Ni)8S16 |
IMA symbol | Tlk [1] |
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. [2] 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. [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 °C (176 °F) to 100 °C (212 °F) it decomposes to tetragonal cubanite plus bornite. [6] [7]