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many textbooks (e.g.) give the mixed valence formula (Cu+)2(Cu2+)(S2-)(S2)2- for CuS, X-ray photoelectron spectroscopic data give strong evidence that, in terms of the simple oxidation state formalism, all the known copper sulfides should be considered as purely monovalent copper compounds, and more appropriate formulae would be (Cu+)3(S2-)(S2)- for CuS, and (Cu+)(S2)- for CuS2, respectively.

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