Abstract

The incommensurately modulated structure of isotropic lazurite (the Baikal region) was established for the first time. The structure was solved within a pseudocubic unit cell with the parameter a = 9.077(1) A and the (3 + 2)-dimensional superspace group Pnn2(γγ0, γ-g0) based on a twin model consisting of three two-dimensionally modulated orthorhombic components related by a threefold axis along the [111] direction. The structure was refined with isotropic thermal parameters to wR0 = 1.98% and wR1 = 7.5% using 257 main reflections and 2392 first-order satellite reflections, respectively.

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