Rustenburgite
| Rustenburgite | |
|---|---|
 |
|
| General and classification | |
| other names |
IMA 1974-040 |
| chemical formula | (Pt, Pd) 3 Sn |
|
Mineral class (and possibly department) |
elements |
|
System no. to Strunz and to Dana |
1.AG.10 ( 8th edition : I / A.16) 02/01/05/02 |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | m 3 m |
| Space group | Fm 3 m |
| Lattice parameters | a = 3.99 Å Please complete the source as an individual reference |
| Formula units | Z = 4 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | 5 |
| Density (g / cm 3 ) | 15.08 |
| Cleavage | Please complete |
| colour | tin white |
| Line color | Please complete |
| transparency | opaque |
| shine | metallic |
Rustenburgite is a very rarely occurring mineral from the mineral class of the elements, more precisely metals and intermetallic compounds . It crystallizes in a cubic crystal system with the chemical composition (Pt, Pd) 3 Sn and forms grains up to 100 μm in size or drop-like inclusions of tin-white color.
Etymology and history
The mineral was first in 1975 by de SA Mihálik, SA Hiemstra and JPR Villiers in the Rustenburg mine in Rustenburg in the province of North West in South Africa found. It was named after this too.
classification
In the Strunz system , rustenburgite is counted among the metals and intermetallic compounds, a subgroup of the elements. After the 8th edition it forms a group together with atokit , niggliit , palarstanid , stannopalladinit , plumbopalladinit and zvyagintsevit . In the 9th edition it forms with Atokit and Zvyagintsevit a subgroup of the PGE (platinum group elements) metal alloys.
In the systematics according to Dana , which is mainly used in the English-speaking world , with isoferroplatinum , atokite, zvyagintsevit, chengdeit and yixunit, a subgroup of the metallic elements and alloys with platinum metals .
Crystal structure
Rustenburgite crystallizes in the cubic crystal system in the space group Fm 3 m with the lattice parameters a = 3.99 Å and four formula units per unit cell .
Education and Locations
Rustenburg forms in platinum metal concentrates. Depending on where it was found, it is associated with atokite and platinum tellurids or monchite , pyrrhotite and pentlandite .
There are currently (as of July 2010) 17 known sites of the rarely occurring mineral. In addition to its type locality and other finds in the Bushveld complex in South Africa, these include Curionópolis in Brazil , Midu in China , the Lemmenjoki in Finland , Norilsk and other sites in Russia as well as the Stillwater complex in the US state of Montana .
See also
literature
- Rustenburgite in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).
