Eskebornit
| Eskebornit | |
|---|---|
| General and classification | |
| chemical formula | CuFeSe 2 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.CB.10 ( 8th edition : II / C.03) 02.09.01.02 |
| Crystallographic Data | |
| Crystal system | tetragonal |
| Crystal class ; symbol | tetragonal-scalenohedral; 4 2 m |
| Room group (no.) | P 4 2 c (No. 112) |
| Lattice parameters | a = 5.518 Å ; c = 11.048 Å Please complete the source as an individual reference |
| Formula units | Z = 4 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | 3 to 3.5 |
| Density (g / cm 3 ) | 5.35 |
| Cleavage | Please complete |
| colour | brownish yellow |
| Line color | black |
| transparency | opaque |
| shine | metallic |
| magnetism | noticeably |
Eskebornite is a very rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the tetragonal crystal system with the chemical composition CuFeSe 2 and forms crystals in the form of thick, up to one millimeter large, brown-yellow plates, which are typically grown together with other selenides .
Etymology and history
The mineral was first found in 1949 by Paul Ramdohr in the Eskeborn tunnel near Tilkerode in the Harz Mountains in Germany. He named it after the place where it was found.
classification
In the Strunz system , eskebornite is classified as sulphides and sulphosalts. It is counted among the sulphides with a ratio of metal to sulfur, selenium or tellurium of 1: 1. In the eighth edition , it formed a group with chalcopyrite , gallite , laforêtite , lenaite and roquesite . In the ninth edition , the sulphides are also subdivided according to cations, where eskebornite forms a subgroup of metal sulphides with a ratio of metal to sulfur, selenium or tellurium of 1, with chalcopyrite, putoranite , haycockite , laforêtite, lenaite, mooihoekite , gallite, roquesite and talnakhite : 1 and zinc , iron , copper or silver .
In the systematics of minerals according to Dana, together with chalcopyrite, gallite, laforetite, lenaite and roquesite, it forms the chalcopyrite subgroup of sulfides - including selenides and tellurides - with the composition Am Bn Xp, with (m + n): p = 1: 1 .
Education and Locations
Eskebornite forms at low temperatures under hydrothermal conditions. It is associated with chalcopyrite, clausthalite , tiemannite , berzelianite , naumannite , umangite , geffroyite , chaméanite , uraninite , anchorite and dolomite .
A total of 24 locations of the mineral are known (as of January 2011). In addition to the type locality and Lerbach and Alberoda in Germany , Eskebornit was found in the Argentine provinces of La Rioja and Mendoza , in the South Alligator Valley in Australia , in the province of Antonio Quijarro in Bolivia , Uranium City in Canada , Enshi in China , Nové Město na Moravě , Planá u Mariánských Lázní and Předbořice (Central Bohemia ) in the Czech Republic , Chaméane in France , Kletno in Poland and the US states of Colorado and Nevada .
Crystal structure
Eskebornite crystallizes in the tetragonal crystal system in the space group P 4 2 c with the lattice parameters a = 5.518 Å and c = 11.048 Å as well as four formula units per unit cell .
See also
Individual evidence
literature
- Eskebornit in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf )