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Parts. -Yellow-green single crystals of the new compound Cu20Sb35O44Cl37 are synthesized from a mixture of SiO2, Sb2O3, and CuCl in 1:1:1 molar ratio (500°C, 93 h). As revealed by single crystal XRD the compound crystallizes in the tetragonal space group I4/mmm with Z = 2. The crystal structure consists of edge-sharing [Cu10Cl16] 6-T3 supertetrahedra that form infinite chains, and isolated, octahedral [Sb 35 Cl 5 O 44 ] 12+ clusters with pseudo-cubic symmetry. The anionic part and the covalent [Sb35Cl5O44] 12+ units are separated by an interface of the Sb III lone pairs, which generate a nonbonding shell surrounding the large clusters. -(MAYEROVA, Z.; JOHNSSON*, M.; LIDIN, S.; Angew. Chem., Int. Ed. 45 (2006) 34, 5602-5606; Dep. Inorg. Chem., Arrhenius Lab., Univ. Stockholm, S-106 91 Stockholm, Swed.; Eng.) -W. Pewestorf 46-008