Stibiopalladinite
Stibiopalladinite | |
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Stibiopalladinite (bottom center, probably embedded in calcite) from Tilkerode ( Abberode ) in the Harz | |
General and classification | |
other names |
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chemical formula | Pd 5 Sb 2 |
Mineral class (and possibly department) |
Sulfides and sulfosalts |
System no. to Strunz and to Dana |
2.AC.20 ( 8th edition : II / A.05) 03/02/03/01 |
Crystallographic Data | |
Crystal system | hexagonal |
Crystal class ; symbol | dihexagonal-pyramidal; 6 mm |
Room group (no.) | P 6 3 cm (No. 185) |
Lattice parameters | a = 7.61 Å ; c = 14.21 Å |
Formula units | Z = 6 |
Twinning | universal |
Physical Properties | |
Mohs hardness | 4 to 5 |
Density (g / cm 3 ) | calculated: 10.8 |
Cleavage | Please complete |
colour | silvery white to steel gray with a pink tinge |
Line color | black |
transparency | opaque |
shine | Metallic luster |
Stibiopalladinite obsolete as Allopaladium or Eugenesit known is a rarely occurring mineral from the mineral class of " sulfides and sulfosalts ". It crystallizes in the hexagonal crystal system with the composition Pd 5 Sb 2 , so it is chemically a palladium - antimonite .
Stibiopalladinite is opaque in every form and only develops microscopic crystals up to about 200 micrometers in size with a hexagonal, tabular habit and a strong metallic sheen . Mostly, however, it is found in the form of rounded grains and coarse aggregates, fused with sperrylite, from silver-white to steel-gray in color with a pinkish tinge (in polished areas also yellowish-white).
Etymology and history
The mineral was found in 1927 by HR Adam at its type locality , Tweefontein Farm in the Bushveld complex in South Africa . He named it after the elements it contained palladium and antimony (Latin stibium). Adam initially determined the composition of the mineral to be Pd 3 Sb, but while researching Mertieit, George A. Desborough found the correct composition Pd 5 Sb 2 .
classification
In the Strunz system , stibiopalladinite 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 , palladoarsenide , palladobismutoarsenide , palladodymite , polkanovite , rhodarsenide , stillwaterite , ungavaite and vincentite . In the 9th edition it forms its own subgroup of compounds of semimetals with platinum group elements (PGE).
In the systematics according to Dana , which is mainly used in the English-speaking world , with palarstanide it forms a subgroup of sulfides, selenides and tellurides with the composition A m B n X p , with (m + n): p = 5: 2.
Education and Locations
Stibiopalladinite is a rare component of platinum deposits. It is associated with braggite , cooperite , mertieite-II , sperrylite , platinum - iron - copper - [nickel] alloys, genenkinite , platarsite , chromite , chalcopyrite , pentlandite , pyrrhotite , geversite , gold and violarite .
A number of locations of the mineral are known. These include the type locality Abberode and Zorge in the Harz ( Germany ), Goodnews Bay in the US state of Alaska , Lydenburg and other sites in South Africa , Chocó in Colombia , Norilsk and Slatoust in Russia , Lac des Îles in the Canadian province of Ontario .
Crystal structure
Stibiopalladinite crystallizes in the hexagonal crystal system in the space group P 6 3 cm (space group no. 185) with the lattice parameters a = 7.61 Å and c = 14.21 Å as well as 6 formula units per unit cell .
See also
Individual evidence
- ^ A b c Hugo Strunz , Ernest H. Nickel: Strunz Mineralogical Tables . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 60 .
- ↑ George A. Desborough, JJ Finney, BF Leonard: Mertieite, a new palladium mineral from Goodnews Bay, Alaska. In: American Mineralogist. 1973, 58, pp. 1-10 ( minsocam.org PDF).
- ^ New Dana Classification of Sulfide Minerals.
literature
- Helmut Schrätze, Karl-Ludwig Weiner: Mineralogy. A textbook on a systematic basis . de Gruyter, Berlin / New York 1981, ISBN 3-11-006823-0 , p. 117 .
- Friedrich Klockmann : Klockmann's textbook of mineralogy . Ed .: Paul Ramdohr , Hugo Strunz . 16th edition. Enke, Stuttgart 1978, ISBN 3-432-82986-8 , pp. 415 (first edition: 1891).
- Stibiopalladinite. In: Anthony et al .: Handbook of Mineralogy. 1990, 1, 101 ( handbookofmineralogy.org PDF).
- Louis J. Cabri, T. Tzong: Stibiopalladinite from the type locality. In: American Mineralogist. 61, 1976, pp. 1249-1254 ( minsocam.org PDF).
Web links
- Mineral Atlas: Stibiopalladinite
- Stibiopalladinit at mindat.org (English)