Ungavait
| Ungavait | |
|---|---|
| General and classification | |
| other names |
IMA 2004-020 |
| chemical formula | Pd 4 Sb 3 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.AC.35b ( 8th edition : II / A.05) 06/02/04/03 |
| Crystallographic Data | |
| Crystal system | tetragonal |
| Crystal class ; symbol | tetragonal-trapazohedral; 4 / m 2 / m 2 / m (422) |
| Room group (no.) | P 4 1 2 1 2, P 4 1 22, P 4 3 2 1 2, P 4 2 2 1 2 or P 4 2 22 (No. 92, 91, 96, 94 or 93) |
| Lattice parameters | a = 7.7388 Å ; c = 24.145 Å Please complete the source as an individual reference |
| Formula units | Z = 8 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | not defined |
| Density (g / cm 3 ) | calculated: 7.264 |
| Cleavage | not observed |
| Break ; Tenacity | not observed |
| colour | light creamy white |
| Line color | not defined |
| transparency | opaque |
| shine | Metallic luster |
Ungavait is an extremely rare mineral from the mineral class of " sulfides and sulfosalts ". It crystallizes in the tetragonal crystal system with the composition Pd 4 Sb 3 , so from a chemical point of view it is an alloy-like compound of palladium and antimony and the palladium analogue of genenkinite (Pt 4 Sb 3 )
Ungavait has so far only been found in the form of microcrystalline grains of about 36 to 116 micrometers in size and light creamy white in color.
Etymology and history
Ungavait was first discovered in 2004 in the “Mesamax Northwest” deposit in the Cape Smith Mountains on the Ungava Peninsula in the Canadian province of Québec. The mineral was described by Andrew M. McDonald, Louis J. Cabri, Christopher J. Stanley, Nikolay S. Rudashevsky, Glenn Poirier, James E. Mungall, Kirk C. Ross, Bruce R. Durham and Vladimir N. Rudashevsky who made it named Ungava after its type locality .
classification
Already in the now outdated, but still in use 8th edition of the mineral classification according to Strunz , ungavaite belonged to the class of "sulfides and sulfosalts" and there to the department of "alloys and alloy-like compounds", where it together with arsenopalladinite , athenite , genenkinite , isomertieite , Mertieit-I , Mertieit-II , Miessiit ( IMA 2006-013 ), Majakit , Menshikovit , Naldrettit , Palladoarsenid , Palladobismutoarsenid , Palladodymit , Polkanovit , Rhodarsenid , stibiopalladinite , Stillwaterit and Vincentit the "Arsenopalladinit group" with the system number. II / A.05 .
The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), also assigns ungavait to the category of "alloys and alloy-like compounds". However, this is further subdivided according to the predominant metals in the compound, so that the mineral can be found according to its composition in the sub-section "Alloys of semi-metals with platinum group elements (PGE)", where it is the only member of the unnamed group 2 .AC.35b forms.
The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns ungavait to the class of "sulphides and sulphosalts" and there in the category of "sulphide minerals". Here he is together with Genkinit and Oulankait in the " Genkinit group " with the system no. 02.06.04 within the subsection "Sulphides - including selenides and tellurides - with the composition A m B n X p , with (m + n): p = 4: 3".
Education and Locations
So far (as of 2013) Ungavait could only be detected at its type locality, the "Mesamax Northwest" deposit on the Ungava Peninsula in Canada. Microcrystalline grains with inclusions of gold-silver alloys or associated with chalcopyrite and chlorites were found there. As another assemblages were Cobaltit , galena , magnetite , pentlandite , pyrrhotite and sphalerite observed.
Crystal structure
Ungavait crystallizes tetragonally in the space group P 4 1 2 1 2, P 4 1 22, P 4 3 2 1 2, P 4 2 2 1 2 or P 4 2 22 (space group no. 92, 91, 96, 94 or 93 ) with the lattice parameters a = 7.7388 Å and c = 24.145 Å as well as 8 formula units per unit cell .
See also
literature
- Andrew M. McDonald, Louis J. Cabri, Christopher J. Stanley, Nikolay S. Rudashevsky, Glenn Poirier, James E. Mungall, Kirk C. Ross, Bruce R. Durham, Vladimir N. Rudashevsky: Ungavaite, Pd 4 Sb 3 , a new intermetallic mineral species from the Mesamax northwest deposit, Ungava region, Quebec, Canada: Description and genetic implications , In: The Canadian Mineralogist , Volume 43 (October 2005), pp. 1735-1744 doi : 10.2113 / gscanmin.43.5.1735
Web links
Individual evidence
- ↑ a b c IMA / CNMNC List of Mineral Names; February 2013 (PDF 1.3 MB)
- ↑ a b Webmineral - Ungavaite