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The Canadian Mineralogist; October 1996; v. 34; no. 5; p. 949-958
© 1996 Mineralogical Association of Canada
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Inversion between sphalerite and wurtzite-type structures in the system Zn-Fe-Ga-S

Teiichi Ueno, Steven D. Scott, and Shoji Kojima

Fukuoka University of Education, Department of Earth Sciences, Fukuoka, Japan
University of Toronto, Canada
Institute of Mineralogy, Petrology and Economic Geology, Japan

The inversion between sphalerite and wurtzite in the system Zn-Fe-Ga-S was investigated by dry synthetic phase-equilibrium experiments. In the projection diagrams of the ZnS-FeS-GaS pseudoternary system at 900 degrees and 800 degrees C, the (Zn,Fe,Ga) (sub 1-x) S solid solution extends over an extensive region from the ZnS composition toward both FeS- and GaS- compositions. At 900 degrees C, this solid solution has the sphalerite structure along the ZnS-FeS join, consists of a mixture of sphalerite + wurtzite where there is a small amount of GaS component, and adopts the wurtzite structure where there is a greater proportion of the GaS and FeS components. A mixed sphalerite + wurtzite type occurs in the GaS-rich portion of the ZnS-GaS join and slightly extending toward the FeS composition. At 800 degrees C, there is a similar distribution of polymorphs within the solid-solution field, except that the mixed sphalerite + wurtzite field is more extensive and includes the entire ZnS-GaS join. Heating experiments show that the inversion from the sphalerite structure to the wurtzite structure for a sample having composition (ZnS) 70 (GaS) 30 occurs near 875 degrees C. Reaction rates of this inversion are slow in both directions; the inversion temperature depends on the bulk composition (especially the concentration of cations) and the sulfur fugacity.

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