The crystal structure of the Ag2SnS3 compound was determined by the single crystal method in the anisotropic approximation in the space group C/2c (Pearson symbol mS52-3.8) with the unit cell parameters a = 0.66323(11), b = 1.14626(13), c = 1.32381(23) nm, beta = 98.008(14)degrees based on 1767 measured reflections (R-F = 6.96%, GOF = 1.030). The compound crystallizes in its own structure type. The lattice is composed of SnS6 octahedra combined into layers, with the silver atoms situated in the channels between them. For the titled crystals, thermo-EMF, electrophysical and optical properties were determined. (C) 2012 Elsevier B.V. All rights reserved.