Kesterite
- Isostannit
- Khinganit
Kesterite is a rarely occurring mineral from the mineral class of " sulfides and sulfosalts ". It crystallizes in the tetragonal crystal system with the chemical composition Cu2 ( Zn, Fe) SnS4 given in the parentheses elements zinc and iron can relax in the formula each represent each other (substitution, Diadochie ), but are always in the same proportion to the other ingredients the mineral.
Etymology and history
Was first discovered in Kesterite Arga Ynnakh Khai granite massif of Jana Valley near the settlement Kester ( Kester also ) in the Russian Republic of Sakha ( Yakutia) and after this locality it is named.
This has been described mineral 1956 by ZV Orlova.
Classification
Already in the now outdated but still in use 8th edition of the mineral classification by Strunz was one of Kesterite to the mineral class of " sulfides and sulfosalts " and then to the Department of " sulfides with the molar ratio of metal: sulfur, selenium, tellurium = 1:1", where he collaborated with Barquillit, Briartit, Černýit, Famatinit, Ferrokësterit, Hocartit, Kuramit, Luzonit, Permingeatit, Petrukit, Pirquitasit, Rhodostannit, Sakuraiit, stannite, Toyohait and Velikit the " Stannitgruppe " with the system no. II/C.06 formed.
The 9th edition used since 2001 and valid by the International Mineralogical Association (IMA ) of the Strunz'schen Mineral classification assigns the Kesterite also in the class of " sulfides and sulfosalts " and there in the department of "Metal Sulfides, M: S = 1: 1 ( and similar ) " a. This division, however, is further subdivided according to the dominant in the metal compound, so that the mineral according to its composition in the subsection " with zinc (Zn ), iron ( Fe), copper (Cu), silver (Ag ), etc., " Finding is where it together with Černýit, Ferrokësterit, Hocartit, Idait, Kuramit, Pirquitasit, stannite and Velikit the " Stannitgruppe " with the system no. 2.CB.15a forms.
The mainly common in English-speaking classification of minerals according to Dana assigns the Kesterite into the class of " sulfides and sulfosalts " and there in the department of " sulfide minerals ." Here he is with stannite, Černýit, Briartit, Kuramit, Sakuraiit, Hocartit, Pirquitasit, Velikit, Ferrokësterit and Barquillit in the " Stannitgruppe ( Tetragonal: I42m ) A2BCS type " with the system no. 02:09:02 within the subdivision " sulfides - including selenides and tellurides - with the composition AmBnXp, with (m n): p = 1:1" to find.
Education and Locations
Kesterite forms in hydrothermal quartz -sulphide veins in tin deposits. Accompanying minerals include arsenopyrite, chalcopyrite, chalcocite, sphalerite, and tennantite Stannoidit.
A rare mineral formation Kesterite previously could (as of 2012) are detected only at a few localities, of which approximately 60 localities are known. Apart from its type locality Kester the mineral only appeared in the Deputatskoe deposit at Verkhoyansk in Russia.
The only known locality in Germany is the pit " Bayerland " at Pfaffenreuth in the town of Leonberg ( Upper Palatinate ) in Bavaria.
In Austria, the mineral is found so far only for Haidbachgraben near Semmering in Lower Austria and in the pit " Haagen " at Webing in the Salzburger community Abtenau.
Famous Swiss localities are the mining Lengenbach in the Binn Valley and the quarry La Plâtrière in Granges (Sierre ) in the canton of Valais.
Other localities lie among others in Argentina, Bolivia, Bulgaria, China, Finland, France, Greece, Greenland, Italy, Japan, Canada, Namibia, Norway, Peru, Poland, Portugal, Czech Republic, Uzbekistan, the United Kingdom ( UK) and the United States of America (USA).
Crystal structure
Kesterite crystallized tetragonal space group I4 ( Raumgruppen-Nr. 82) with the lattice parameters a = 5.43 Å and c = 10.87 Å and two formula units per unit cell.