Sulphur-rich TlIn(S1-xSex)(2) single crystals (0 <= x <= 0.10) were grown by the Bridgman technique. Their structure and composition are studied by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Raman scattering. In the Raman spectra, besides the typical one-mode and two-mode features, bands corresponding to internal vibrations of "mixed" In4S10-ySey structural groups are revealed. (C) 2013 Elsevier B.V. All rights reserved.