Abstract
The title compound, digadolinium(III) oxidodisilicate, Gd(2)[Si(2)O(7)], was obtained in its M-type crystal structure after attempts to synthesize Gd(5)Br(3)[AsO(3)](4) as a by-product from fused silica ampoules. It crystallizes isotypically with M-type Eu(2)[Si(2)O(7)]. This structure consists of layers of ecliptically arranged oxidodisilicate [Si(2)O(7)](6-) units separated from each other by bilayers consisting of Gd(III) cations.