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The system Fe-Nb-S and its geological implications


, : The system Fe-Nb-S and its geological implications. The Canadian Mineralogist 48.5

Phase relations within the system Fe-Nb-S were studied experimentally by the technique of evacuated silica glass tubes in the temperature interval 400-1000 degrees C. The dominant field in the system is a broad solid-solution Fe(x) Nb(y) S2 (0<x<0.5, 1.0<y<1.4) that includes the composition of the mineral edgarite. Also, it forms stable assemblages with pyrrhotite and pyrite. The iron sulfides dissolve limited amounts of Nb: pyrrhotite dissolves up to 1.13 at.% Nb, and pyrite, only 0.02 at.% Nb. We refined the crystal structure of five samples of the Fe(x) Nb(y) S2 solid solution, and established the relation between the unit-cell volume and Fe/(Fe+Nb). The occurrence of edgarite can be expected in associations with other sulfides crystallizing under extremely low fugacity of oxygen.

US$19.90

DOI: 10.3749/canmin.48.5.1059


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