Electron-microprobe and single-crystal X-ray-diffraction analyses have confirmed the second occurrence of felbertalite in the Funiushan copper skarn deposit, near Nanjing, in eastern China. It can be chemically described as Cu 2AgxPb6–2xBi8+x(S,Se)19, with a wide range of substitution of Bi + Ag for 2Pb, with x ranging from 0.64 to 1.03 (probably up to 1.33), suggesting the presence of a solid-solution series in felbertalite. The measured unit-cell parameters of a felbertalite grain with a compositi on of Cu2.20Ag0.70Pb4.65Bi8.45S19.12 are: a 27.68(4), b 4.046(1), c 20.67(3) A, � 131.06(8)°, space group C2/m. A set of phases in the bismuthinite–aikinite series, mostly free of Ag and characterized by intermediate compositions between ideal formulae, were identified with electron-microprobe data. Compositional variations from Cu 1.80Pb1.80Bi2.20S6, through Cu1.53Pb1.53Bi2.47S6, Cu1.07Pb1.07Bi2.93S6, Cu0.73Pb0.73Bi3.27S6, to Cu0.58Pb0.58Bi3.42S6 within a single grain were observed, indicating that an intergrowth of three structural units, i.e., bismuthinite ribbons, krupkaite ribbons and aikinite ribbons, could occur in the progressive exsolution or precipitation of a single phase in the bismuthinite–aikinite series. The exceptionally high contents of Ag (0.76–1.27 wt%) i n the phase Cu0.83Ag0.10Pb0.90Bi3.13S6, presumably corresponding to krupkaite, are noted. Electron-microprobe analyses have also revealed the occurrence of a number of rare minerals, including junoite, unknown Cu 2AgxPb10–2xBi12+xS29 (1.23 < x < 1.49), berryite, benjaminite?, schirmerite?, Bi- and Ag-bearing galena, wittichenite and tetradymite. Within the intergrowths of Cu–Ag – Pb–Bi–S(Se,Te) minerals, Te (especially) and Se are preferably partitioned into Ag-bearing phases.