Niggliit
| Niggliit | |
|---|---|
| General and classification | |
| chemical formula | PtSn |
|
Mineral class (and possibly department) |
Elements - metals and intermetallic alloys |
|
System no. to Strunz and to Dana |
1.AG.60 ( 8th edition : I / A.16) 02/01/10/01 |
| Crystallographic Data | |
| Crystal system | hexagonal |
| Crystal class ; symbol | 6 / mmm |
| Space group | P 6 3 / mmc |
| Lattice parameters | a = 4.10 Å ; c = 5.432 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 | 5.5 |
| Density (g / cm 3 ) | 13.14 |
| Cleavage | is missing |
| colour | silver-white, pink to blue in reflected light |
| Line color | Please complete |
| transparency | opaque |
| shine | metallic |
Niggliite is a very rare mineral from the mineral class of the elements, more precisely the metals and intermetallic compounds . It crystallizes in a hexagonal crystal system with the chemical composition PtSn and forms round inclusions up to 75 μm in size and silver-white in color.
Etymology and history
Niggliit was first found in 1936 by DL Scholtz in his type locality Waterfall Gorge in Pondoland , Transkei ( South Africa ). It is named after the Swiss crystallographer Paul Niggli .
classification
In Strunz's systematics , niggliite is counted among the metals and intermetallic compounds, a subgroup of the elements. After the 8th edition , it forms a group together with atokite , palarstanide , plumbopalladinite , rustenburgite , stannopalladinite and zvyagintsevit . In the 9th edition it forms a separate subgroup of the PGE (platinum group elements) metal alloys.
In the Dana system, which is mainly used in the English-speaking world , it forms a separate subgroup of metallic elements and alloys with platinum metals .
Education and Locations
Niggliit forms in veins under hydrothermal conditions. Depending on the deposit, it is associated with pentlandite , chalcopyrite , bornite , parkerite , insizwaite , cubanite , pyrrhotite , among others ; Stannopalladinite , hessite , platinum and palladium tellurides or froodite .
In addition to its type locality, there are other finds from the Bushveld complex and Rustenburg in South Africa , Wuchuan and Koktokay in China , Montschegorsk and Norilsk is Russia , Goodnews Bay in Alaska and Knox County in the US state of Maine .
Crystal structure
Niggliite crystallizes in the hexagonal crystal system in the space group P6 3 / mmc with the lattice parameters a = 4.10 Å , and c = 5.432 Å as well as two formula units per unit cell .
See also
Individual evidence
literature
- Niggliit in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).