Palladium arsenide
Palladium arsenide | |
---|---|
General and classification | |
other names |
IMA 1973-005 |
chemical formula | Pd 2 As |
Mineral class (and possibly department) |
Sulfides and sulfosalts |
System no. to Strunz and to Dana |
2.AC.25 ( 8th edition : II / A.05) 04/02/14/01 |
Crystallographic Data | |
Crystal system | monoclinic |
Crystal class ; symbol | 2 / m |
Space group | P 2 / m |
Lattice parameters |
a = 9.25 Å ; b = 8.47 Å; c = 10.44 Å β = 94.0 ° Please complete the source as an individual reference |
Formula units | Z = 18 Please complete the source as an individual reference |
Physical Properties | |
Mohs hardness | 5 |
Density (g / cm 3 ) | 10.42 |
Cleavage | Completely |
Break ; Tenacity | brittle |
colour | steel gray |
Line color | Please complete |
transparency | opaque |
shine | metallic |
Pallado arsenide is a very rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the monoclinic crystal system with the chemical composition Pd 2 As and forms irregularly shaped grains of up to 0.4 mm in size and steel-gray in color.
Etymology and history
The mineral was found in 1974 by WD Begisow, WI Meschankina, and LS Dubakina in its type locality , the Komsomolski mine near Norilsk in Russia . It was named after the elements palladium and arsenic it contained.
classification
In the Strunz system , pallado arsenide 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 , mertieit-I , mertieit-II , palladobismuto arsenide , palladodymite , polkanovite , rhodarsenide , stibiopalladinite , stillwaterite , ungavaite and vincentine . In the 9th edition it forms with mayakite, naldrettite , palladobismuth arsenide, palladodymite and rhodarsenide a subgroup of compounds of semi-metals with platinum group elements (PGE).
In the Dana system, which is mainly used in the English-speaking world , it forms a separate subgroup of sulfides, selenides and tellurides with the composition A m B n X p , with (m + n): p = 2: 1.
Education and Locations
Pallado arsenide forms in heavy metal concentrates and in faults in chalcopyrite veins . It is associated with chalcopyrite, sperrylite , gold and kotulskite .
Only a few locations are known of the very rare mineral. In addition to its type locality, pallado arsenide was found in Kambalda in Australia , Marathon in Canada , Lapland ( Finland ), Andriamena in Madagascar , Porsanger in Norway , Wadi Hilti in Oman , on the Kola Peninsula in Russia , in the Bushveld Complex in South Africa and in Stillwater -Complex in the US state of Montana .
Crystal structure
Pallado arsenide crystallizes in the monoclinic crystal system in the space group P2 / m with the lattice parameters a = 9.25 Å ; b = 8.47 Å, c = 10.44 Å and β = 94.0 ° as well as 18 formula units per unit cell .
See also
Individual evidence
literature
- Pallado arsenide in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).