Figure 4
Projection along the c axis of (a) the [Ag9Cu(S,Se)2Se2]2+ B (B′) module layer of the lower-temperature Se-rich antimonpearceite structure and (b) the [Ag9CuS4]2+ B (B′) module layer of the 221-polybasite structure (Evain et al., 2006). The sulfur environment around Cu is highlighted by thin S–S connecting lines. |