Palladium arsenide

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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

  1. ^ New Dana Classification of Sulfide Minerals

literature

  • Pallado arsenide in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).

Web links