Mertieit-I
| Mertieit-I | |
|---|---|
| General and classification | |
| chemical formula | Pd 11 (Sb, As) 4 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.AC.15 ( 8th edition : II / A.05) 2.16.1.1 |
| Crystallographic Data | |
| Crystal system | hexagonal |
| Crystal class ; symbol | Please complete |
| Lattice parameters | a = 15.04 Å ; c = 22.41 Å |
| Formula units | Z = 18 |
| Physical Properties | |
| Mohs hardness | 5.5 |
| Density (g / cm 3 ) | 10.2 |
| Cleavage | Please complete |
| colour | brass yellow |
| Line color | Please complete |
| transparency | opaque |
| shine | metallic |
Mertieit-I is a very rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the hexagonal crystal system with the chemical composition Pd 11 (Sb, As) 4 and forms small, up to 0.5 mm large grains of brass yellow color.
Etymology and history
The mineral was found in 1973 by GA Desborough, JJ Finney and BF Leonard in its Fox Gulch type locality in Goodnews Bay in the US state of Alaska . It was named after the American geologist John Beaver Mertie Jr. The type material is held at the National Museum of Natural History , Washington, DC under catalog number 132499.
classification
In the Strunz system , Mertieit-I is one of the alloys and alloy-like compounds, a subgroup of sulfides and sulfosalts. After the 8th edition it forms a group together with arsenopalladinite , athenite , genenkinite , itoigawaite , mayakite , menshikovite , mertieite-II , pallado arsenide , palladobismuto arsenide , palladodymite , polkanovite , rhodarsenide , stibiopalladinite , stillwaterite , ungavaite and vincentite . In the 9th edition it forms with isomerite and miessiite a subgroup of the compounds of semimetals with platinum group elements (PGE).
In the systematics according to Dana , which is mainly used in the English-speaking world , it forms a separate subgroup of sulfides, selenides and tellurides with different formulas.
Modifications and varieties
The mineral is dimorphic to isomer tierite .
Education and Locations
Mertieit-I forms in precious metal concentrates, probably from ultramafic bedrocks. It is associated with gold , chromite , laurite , mertieite-II and platinum - iridium - osmium alloys.
Only a few locations are known of the very rare mineral. In addition to its type locality, Mertieit-I was found in Sodankylä in Finland , Bleida in Morocco , Porsanger in Norway and in the Bushveld complex in South Africa .
Crystal structure
Mertieit-I crystallizes in the hexagonal crystal system with the lattice parameters a = 15.04 Å and c = 22.41 Å as well as 18 formula units per unit cell .
See also
Individual evidence
- ↑ a b Mertieite-I in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( PDF, English, 67 kB ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. ).
- ^ New Dana Classification of Sulfide Minerals
literature
- Mertieit-I in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).