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Mixed monosulfide and disulfide compounds of copper contain both monosulfide (S^2-) as well as disulfide (S₂)^n- anions. Their crystal structures usually consist of alternating hexagonal layers of monosulfide and disulfide anions with Cu cations in trigonal and tetrahedral interstices. CuS, for example, can be written as Cu₃(S₂)S. Several nonstoichiometric compounds with Cu:S ratios between 1.0 and 1.4 also contain both monosulfide as well as disulfide

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