Acta Cryst. (2007). E63, i157  [ doi:10.1107/S1600536807027043 ]

Langbeinite-type Rb₂Ca₂(SO₄)₃

M. Boujelben, M. Toumi and T. Mhiri

Abstract: Single crystals of dirubidium dicalcium tris[sulfate(VI)], Rb₂Ca₂(SO₄)₃, were obtained from solid-state reactions of Rb₂SO₄ and CaSO₄. The title compound crystallizes in the cubic langbeinite-type structure. It features two crystallographically independent CaO₆ octahedra (each with site symmetry 3), which are linked by sharing corners with SO₄ tetrahedra to establish a framework with composition [Ca₂(SO₄)₃]^2-, where the two independent Rb⁺ cations (site symmetry 3) are located in the voids.

Online 15 June 2007

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