This model predicts that filling a zone (e.g., by substituting Fe or Zn for Cu) should cause electrical resistivity to increase. This is confirmed by experimental results which show that a tetrahedrite with about 208 valence electrons per unit cell (approximate composition Cu 10 (Fe,Zn) 2 (Sb,As) 4 S 13 ) has a resistivity 10 7 times higher than that of a tetrahedrite with approximately 205 valence electrons (composition Cu (sub 12.12) Sb (sub 4.09) S 13 ). Synthetic samples have compositions bounded by the line Cu 14 Sb 4 S 13 -Cu 12 Sb (sub 4.67) S 13 .--Modified journal abstract.

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