Abstract. Sn2S 3, orthorhombic, Pnma, a = 8.878 (2), b = 3.751 (1), c = 14.020 (3) A, z = 4, D m = 4.87, D x = 4.75 Mg m -3, Mr = 333.6,/~(Mo Ka) = 11.8 mm -~, final R = 0.04 for 1335 observed X-ray data. The crystal structure was redetermined using a crystal of improved quality and a diffractometer and applying corrections for absorption and extinction. The results of the previous determination with film data [Mootz & Puhl (1967). Acta Cryst. 23, 471-476] were confirmed, but a higher accuracy and more reliable anisotropic thermal parameters were achieved.