Talnakhit
| Talnakhit | |
|---|---|
 |
|
| General and classification | |
| other names |
IMA 1967-014 |
| chemical formula | Cu 9 (Fe, Ni) 8 S 16 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.CB.10 ( 8th edition : II / C.04) 02.09.08.01 |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | 4 3 m |
| Space group | I 4 3 m |
| Lattice parameters | a = 10.59 Å Please complete the source as an individual reference |
| Formula units | Z = 2 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | 4 to 4.5 |
| Density (g / cm 3 ) | 4.29 |
| Cleavage | Please complete |
| colour | yellow |
| Line color | black |
| transparency | opaque |
| shine | metallic |
Talnakhite is a very rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the cubic crystal system with the chemical composition Cu 9 (Fe, Ni) 8 S 16 and forms narrow, up to two millimeters long, slat-shaped, yellow crystals that are usually fused with other copper - iron sulfides.
Etymology and history
The mineral was first found in 1968 by IA Bud'ko and EA Kulagow in the Severniy mine near Talnach near Norilsk in Russia . They named it after the place where it was found Talnach (English Talnakh).
classification
In the Strunz system , talnakhite is classified as sulfides and sulfosalts. It is counted among the sulphides with a ratio of metal to sulfur, selenium or tellurium of 1: 1. In the eighth edition , it formed a group with haycockite , isocubanite , mooihoekite , orickite , putoranite and wilhelmramsayite . In the ninth edition , the sulfides are also subdivided according to cations, where talnakhite and chalcopyrite , eskebornite , haycockite, laforêtite , lenaite , mooihoekite, gallite , roquesite and putoranite form a subgroup of metal sulfides with a ratio of metal to sulfur, selenium or tellurium of 1 : 1 and zinc , iron , copper or silver .
In the systematics of minerals according to Dana , which is mainly used in the English-speaking world , it forms a subgroup of sulfides - including selenides and tellurides - with haycockite and mooihoekite with the composition Am Bn Xp, with (m + n): p = 1: 1.
Education and Locations
Talnakhite forms in high concentrations under hydrothermal conditions. The mineral also forms under water in black smokers . It is associated with chalcopyrite , cubanite , djerfisherite , pentlandite , vallerite or mackinawit , magnetite , silver - gold and palladium - lead alloys.
So far, 19 locations of the Talnakite are known. In addition to its type locality and other finds in Russia, Talnakhit was found in Suichang in China , Kittilä and Sodankylä in Finland , Laurion in Greece , Takahashi , Kaminokuni and Hidaka in Japan , Cradock and Loolekop in South Africa , Cármenes in Spain and the US states Minnesota , Montana, and Utah .
Crystal structure
Talnakhite crystallizes in the cubic crystal system in the space group I 4 3 m with the lattice parameter a = 10.59 Å and two formula units per unit cell .
See also
Individual evidence
- ↑ Mineralienatlas: Talnakht
- ^ List of minerals according to Dana at webmineral.com
- ↑ Talnakhite at mindat.org (Eng.)
literature
- Talnakhit in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf )
