Gladite, PbCuBisS9, is orthorhombic, space group Pbnm, with a= 33531 (6), b = 11.486 (2), c = 4003 (2) /~, Dm=696 and Dx=691 gcm -3 for Z=4. Diffraction data were recorded with the multiplefilm technique, using graphite-monochromated Ag/Ca and an integrating precession camera equipped with a masked film cassette, and measured with an automated photoscanner. Gladite is a superstructure with [a,b,c]=[300/OlO/O01] [a,b,c] of bismuthinite, Bi2Sa. The structure was solved through systematic examination of all configurations permitted by the subcell-supercell relation and refined, by least-squares techniques, to R= 13.7 % for 1036 observable reflections. The structure is a derivative of Bi2S3 in which + of the Bi atoms are replaced by Pb, and Cu is added to ½ of a set of available tetrahedral interstices in locations associated with the Pb atoms. In spite of close similarity between the structures of Bi2S3 and PbCuBiSa, gladite does not contain a mixture of the four-membered [Bi4S6] and [Pb2Cu2Bi2S6] ribbons found, respectively, in these structures but rather consists of [Bi4S6] ribbons alternating along [100] with pairs of a new type of [PbCuBi3S6] unit.