The title compound, dicerium(III) oxidodisilicate, Ce 2 [Si 2 O 7 ], was obtained as a by-product in its H -type structure after attempts to synthesize CeSb 2 O 4 Cl from fused silica ampoules. It crystallizes isotypically with H -La 2 [Si 2 O 7 ]. The four crystallographically distinct Ce III cations form distorted square anti-prisms, capped square anti-prisms, and bicapped square anti-prisms as coordination polyhedra consisting of oxygen atoms. Four crystallographically different silicon atoms recruit the centers of two different isolated [Si 2 O 7 ] 6- units.
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