... wt.%, corresponding to more than 3 apfu, and predominates over Sb ( Fig. 4 ). A small amount of Ag is also present, and Se substitutes for S up to 1.34 apfu ( Table 3 , Fig. 5 ). Table 3. Representative compositions of goldfieldite and stibigoldfieldite, wt.% № Cu Ag Sb Te As S Se...