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A unique Cu-bearing chain silicate, Li 2 (Mg,Cu)Cu 2 [Si 2 O 6 ] 2 , was synthesized, and the structure was determined by single-crystal X-ray diffraction techniques. The structure was found to be triclinic, space group P1̄, with unit-cell parameters a = 5.7068(7), b = 7.4784(9), c = 5.2193(3) Å, α = 99.911(8), β = 97.436(8), γ = 84.52(1)°, and Z = 1. The arrangement of zweier single chains, [Si 2 O 6 ], differs significantly from chain arrange­ments in the pyroxene and pyroxenoid structures, and the “I-beam” description of the pyroxene structure is not applicable. The structure may be classified as a new derivative type of the pyroxene structure, with an “oblique I-beam”. Cu atoms are coordinated by four O atoms in a square-planar arrangement with 1.94-2.00 Å for Cu-O and two O atoms with longer Cu-O distances of 2.41-2.92 Å, consistent with the crystal-field stabilization of the d 9  electronic structure of Cu 2+ . The square-planar CuO 4  units form a [Cu n O 2n+2 ] ribbon with n = 3 in the structure, which is also found in Cu-bearing chain silicates such as shattuckite and planchéite with n &gt; 3. Mg is octahedrally coordinated by O atoms, but the configuration is affected by the partial replacement by Cu.

Structure of synthetic Li 2 (Mg,Cu)Cu 2 [Si 2 O 6 ] 2 : A unique chain silicate related to pyroxene