Yellowish elongated crystals of the two new compounds Pb ₆LaO₇-Br (1) and Pb₆LaO₇Cl (2) have been obtained by the method of solid-state reactions. Both structures can be described in the terms of oxo-centered tetrahedra. The structures of 1 and 2 consist of [O₇Pb₆La]⁺ chains that are built from oxocentered OA₄ (A = Pb, La) tetrahedra. The halogen ions connect the chains through weak Pb-X bonds. An arrangement of eight OA ₄ tetrahedra that all share the same central La atom forms a [O ₈Pb₁₀La₃]¹³⁺ cluster. The clusters are linked into chains, and additional OPb₄ tetrahedra are attached to the chains. Incorporation of Cl atoms instead of Br atoms into the structure causes a lowering of the symmetry from Cmcm to C2/m.