Abstract: | The structure of copper(I,II) pentachromium(III) germanate, Cu(Cu0.44Cr4.56)Ge2O12, contains one Cu position (m2m), one Ge position (m) and three Cr positions (2/m, m and 2). The close‐packed structure is described in terms of slabs of edge‐sharing Cr3+O6 octahedra and isolated CuO4 and GeO4 tetrahedra. These slabs are aligned parallel to the bc plane and are separated from each other by GeO4 tetrahedra along a. The tetrahedral coordination observed for the Cu+/Cu2+ ions represents an unusual feature of the structure. The Cr—O and Cu—O bond lengths are compared with literature data. |