A re-examination of herzenbergite-teallite solid solution at temperatures between 300 700 deg C

摘要

In order to investigate the range of the solid solution series in herzenbergite-teallite minerals, samples of different composition were synthesized. Herzenbergite-teallite minerals were synthesized by an evacuated silica glass tube method at 700 deg C. A linear relationship between cell dimensions, a, b and c and composition is established. Extension of solid solution to the Pb-rich portion of the system PbS-SnS is limited; the solid solution area is between Pb_(1.060)Sn_(0.940)S_2 and SnS at 700 deg C. Teallite coexisting with galena was also synthesized by hydrothermal recrystallization at 300, 400 and 450 deg C. The compositions of teallite are Pb_(1.140)Sn_(0.860)S_2 at 300 deg C, Pb_(1.114)Sn_(0.886)S_2 at 400 deg C, and Pb_(1.124)Sn_(0.876)S_2 at 450 deg C, respectively. Their compositions shift towards the PbS end-member form Stoichiometric teallite. The cell dimensions of teallite, which was synthesized hydrothermally, follow the linear relationship between cell dimensions and composition established at 700 deg C.