The new structure determinations of low chalcocite, Cu2S, and djurleite, Cu1.938S, have provided a large number of observations of the coordination behavior of copper with sulfur in copper-rich sulfides. Ranges of Cu-S bond lengths are 2.18 to 2.24Å in linear CuS2 groups; 2.21 to 2.60Å in triangular CuS3 groups; 2.23 to 2.90Å in tetrahedral CuS4 groups. Cu–Cu distances range from 2.45Å upward, the most common around 2.77Å. These observations are compared with structural data from other copper-rich sulfides, in which the tetrahedral, triangular and linear Cu–S bond configurations frequently show large distortions and wide variations in bond lengths.

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