Study of the minerals on the PbS-Sb_2S_3 join : Part1: Phese reration above 400℃

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The phase equilibrium studies of the PbS–Sb<SUB>2</SUB>S<SUB>3</SUB> join were carried out by the evacuated glass tube method and DTA at temperatures above 400°C. In addition to the end-members of stibnite and galena, three minerals, zinkenite, robinsonite and boulangerite, and five synthetic phases D, E, F, H and I were found on this join, and their chemical compositions, thermal stabilities and crystallographic properties were determined.<BR>Stibnite melts congruently at 546°C. Zinkenite has a composition of 9Pb·11Sb<SUB>2</SUB>S<SUB>3</SUB> and melts incongruently to robinsonite and liquid at 546°C. A eutectic reaction between stibnite and zinkenite occurs at 516°C. Robinsonite having 4PbS·3Sb<SUB>2</SUB>S<SUB>3</SUB> composition melts incongruently to phase D and liquid at 582°C. Phase D having a composition of 5PbS·3Sb<SUB>2</SUB>S<SUB>3</SUB> is stable on the PbS–Sb<SUB>2</SUB>S<SUB>3</SUB> join at temperatures from 510° to 590°C, at which it melts incongruently to phase E and liquid. Phase E with an ideal composition of 7PbS·4Sb<SUB>2</SUB>S<SUB>3</SUB> is stable at temperatures from 584° to 603°C and melts incongruently to boulangerite and liquid at 603°C. Phase F with a composition of 2PbS·Sb<SUB>2</SUB>S<SUB>3</SUB> is stable from 490° to 584°, at which it decomposes to phase E and boulangerite. Boulangerite with a composition of 5PbS·2Sb<SUB>2</SUB>S<SUB>3</SUB> melts incongruently to phase H and liquid at 640°C. Phase H having a composition of 3PbS·Sb<SUB>2</SUB>S<SUB>3</SUB> is stable only at a temperature range from 625° to 647°, and incongruently melts to gelena and liquid at 647°C. Phase I has a composition of 16PbS·5Sb<SUB>2</SUB>S<SUB>3</SUB>, stable from 610° to 636°C, at which it decomposes to phase H and galena.


  • Mineralogical Journal

    Mineralogical Journal 17(6), 282-289, 1995-04-01

    Japan Association of Mineralogical Sciences

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