The sulfide-tellurides Ba3Cu17-x(S,Te)(11) and Ba3Cu17-x(S,Te)(11.5) were synthesized from the elements in stoichiometric ratios heated to 1073 K, followed by slow cooling to 873 K over 100 h. Ba3Cu17-x(S,Te)(11) is isostructural to Ba3Cu17-x(Se,Te)(11) when [S] > [Te], space group R (3) over barm, with lattice dimensions of a = 12.009(1) angstrom, c = 27.764(2) angstrom, V = 3467.6(5) angstrom(3), for Ba3Cu15.7(4)S7.051(5)Te3.949 (Z = 6). The structure is composed of Cu atoms forming paired hexagonal antiprisms, capped on the two outer hexagonal faces, where each Cu atom is tetrahedrally coordinated by four Q(= S, Te) atoms. The new variant is formed when [Te] > [S]; then Ba3Cu17-x(S,Te)(11.5) adopts space group Fm (3) over barm with a = 17.2095(8) angstrom, V = 5096.9(4) angstrom(3), for Ba3Cu15.6(2)S5.33(4)Te6.17 (Z = 8). This structure consists of eight Te-centered Cu-16 icosioctahedra per cell interconnected by cubic Cu-8 units centered by Qatoms. Electronic structure calculations and property measurements illustrate that these compounds behave as extrinsic p-type semiconductors-toward metallic behavior for the latter compound. With standard oxidation states Ba2+, Cu+, and Q(2-), the electron precise formulas are Ba(3)Cu(16)Q(11) and Ba(3)Cu(17)Q(11.5).