Rutheniridosmin
| Rutheniridosmin | |
|---|---|
| General and classification | |
| chemical formula | (Ir, Os, Ru) |
|
Mineral class (and possibly department) |
Elements - metals and intermetallic alloys |
|
System no. to Strunz and to Dana |
1.AF.05 ( 8th edition : I / A.13) 02/01/02/03 |
| Crystallographic Data | |
| Crystal system | hexagonal |
| Crystal class ; symbol | 6 / mmm |
| Space group | P 6 3 / mmc |
| Lattice parameters | a = 2.726 Å ; c = 4,326 Å Please complete the source as an individual reference |
| Formula units | Z = 2 Please complete the source as an individual reference |
| Twinning | weakly lamellar |
| Physical Properties | |
| Mohs hardness | 6 to 7 |
| Density (g / cm 3 ) | 20.49 |
| Cleavage | perfectly |
| colour | silvery white |
| Line color | Gray |
| transparency | opaque |
| shine | metallic |
Rutheniridosmin is a rare mineral from the mineral class of the elements , more precisely the metals and intermetallic alloys . It crystallizes in the hexagonal crystal system with the chemical composition (Ir, Os, Ru) and forms idiomorphic tablets and grains as well as inclusions in platinum - iron alloys.
Etymology and history
The mineral was probably discovered in 1936 in the Horokanai site, Uryū River in Uryū-gun on the Japanese island of Hokkaidō . It is named after the elements ruthenium , iridium and osmium it contains.
classification
In the Strunz system , rutheniridosmin is counted among the metals and intermetallic compounds, a subgroup of the elements. After the 8th edition it forms a group together with Chengdeit , Hexaferrum , Osmium , Rhenium and Ruthenium . In the 9th edition , it forms a subgroup of the platinum group elements with ruthenium and osmium.
In the classification by Dana it forms with osmium, ruthenium, and Hexaferrum Hexamolybdän the Osmiumgruppe, a subset of the metallic elements with platinum group metals and alloys.
Education and Locations
Rutheniridosmin forms in soap deposits that are washed out from ultramafic rocks. It is associated with other iridium-osmium-ruthenium alloys, sperrylite , hollingworthite , iridarsenite , ruthenarsenite , michenerite , laurite , geversite , moncheit and chromite .
In addition to the type locality in Japan, there are finds from Tasmania ( Australia ), Goze Deltschew in Bulgaria , British Columbia and Manitoba in Canada , Amdo in China , Cauca in Colombia , Assosa in Ethiopia , Peyrolles-en-Provence in France , Kozani in Greece , Parapara known on New Zealand , several localities in Russia and Goodnews Bay and Trinity County in the American states of Alaska and California .
Crystal structure
Rutheniridosmin crystallizes in the hexagonal crystal system in the space group P6 3 / mmc with the lattice parameters a = 2.726 Å and c = 4.326 Å as well as two formula units per unit cell .
See also
Individual evidence
literature
- Rutheniridosmin in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).