Record details

    Exploratory studies of element substitutions in synthetic tetrahedrite. Part II, Selenium and tellurium as anions in Zn-Fe tetrahedrites
Statement of responsibility
    Sven Karup-Moller & Emil Makovicky
    Karup-Moller, Sven
    Makovicky, Emil
Source title - serial
    Neues Jahrbuch für Mineralogie. Monatshefte
    No. 9
    p. 385-399
    2 obr., 6 tab.
    Bibliografie na s. 397-399
    Zkr. název ser.: Neu. Jb. Mineral., Mh.
Classfication no.
Conspectus category
Subject group
    fázová rovnováha
    rudy U
    syntéza minerálu
Geographical name
    Bukov (Žďár nad Sázavou, Bystřice nad Pernštejnem)
    Česká republika
    Předbořice (Písek, Milevsko)
    Rožná (Žďár nad Sázavou, Bystřice nad Pernštejnem)
    Zadní Chodov (Tachov, Tachov)
Abstract (in english)
   Composition limits of iron and/or zinc-bearing selenium tetrahedrite were explored by means of dry syntheses from pure elements at 450 °C. Only the substituted compositions Cu10Zn2Sb4Se13 (a 10.823 A) and Cu10.2Fe1.8Sb4Se13 (a 10.823 A) are stable. All partly substituted and unsubstituted (i.e. Zn, Fe-free) compositions do not materialize. The substituted Se tetrahedrite coexists with Cu3SbSe3, (iron-bearing) Cu2-xSe, Cu3SbSe4 low-Zn sulfide melt. Selenium does not adopt the role of cation and tellurium that of anion in the tetrahedrite structure. The explanation of the severely restricted composition field of selenium tetrahedrite is based on the presumed electronic structure. The sp anionic valence band of Se and the d levels of Cu and Fe overlap, reducing the potentially present Cu2+ and Fe3+ to Cu+ and Fe2+. As the tetrahedrite structure apparently cannot tolerate substantial amounts of electron holes created in the anionic band in this process, such reducible (i.e.
   partly substituted) compositions are absent or their extent is very limited
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    31. 3. 2008
Import date
    8. 8. 2012