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Crystal structure of argentopyrite, AgFe₂S₃, and its relationship with cubanite

¹ Department of Geosciences, University of Arizona, Tucson, Arizona 85721-0077, U.S.A.
² 19 Stonebridge Lane, Pittsford, New York, U.S.A.

View larger version (31K): [in this window] [in a new window]   FIGURE 1. Comparison of crystal structures of (a) cubanite and (b) argentopyrite. The green and yellow tetrahedra represents MS4 and FeS4 groups (M = Cu for cubanite and Ag for argentopyrite), respectively. A three-member ring of tetrahedra in each structure is outlined with a circle, showing the positional difference of the MS4 tetrahedra.

View larger version (17K): [in this window] [in a new window]   FIGURE 2. Comparison of the linkage among the FeS4 tetrahedra in (a) cubanite, (b) argentopyrite, (c) sternbergite, and (d) rasvumite.

View larger version (20K): [in this window] [in a new window]   FIGURE 3. Cation ordering schemes in (a) cubanite, (b) high-temperature ordered phase of cubanite, proposed by Putnis (1977), and (c) argentopyrite. They are represented in terms of sulfur atoms coordinated by metal cations. Green, gray, and small yellow spheres represent M (=Cu in cubanite or Ag in argentopyrite), Fe, and S atoms, respectively.