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A re-examination of herzenbergite–teallite solid solution at temperatures between 300 and 700°C

¹ Department of Mineralogy, Petrology and Economic Geology, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
² Center for Northeast Asian Studies, Tohoku University, Aoba-ku, Sendai 980-8576, Japan
³ 4-30-503 Kadan, Aoba-ku, Sendai 980-0815, Japan

^* E-mail: khayashi{at}mail.cc.tohoku.ac.jp

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°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_1.060Sn_0.940S₂ and SnS at 700°C. Teallite coexisting with galena was also synthesized by hydrothermal recrystallization at 300, 400 and 450°C. The compositions of teallite are Pb_1.140Sn_0.860S₂ at 300°C, Pb_1.114Sn_0.886S₂ at 400°C, and Pb_1.124Sn_0.876S₂ at 450°C, respectively. Their compositions shift towards the PbS end-member from stoichiometric teallite. The cell dimensions of teallite, which was synthesized hydrothermally, follow the linear relationship between cell dimensions and composition established at 700°C.

KEYWORDS: herzenbergite, teallite, solid solution