Three-Dimensionally Modulated Incommensurate Crystal
Structure of Lazurite from the Baikal Region

N. B. Bolotina*, R. K. Rastsvetaeva*, A. N. Sapozhnikov**, A. A. Kashaev***,
A. Schöenleber****, and G. Chapuis****

* Shubnikov Institute of Crystallography, Russian Academy of Sciences,
Leninski pr. 59, Moscow, 119333 Russia

e-mail: rast@ns.crys.ras.ru

** Vinogradov Institute of Geochemistry, Siberian Division, Russian Academy of Sciences,
ul. Favorskogo 1a, Irkutsk, 664033 Russia

*** Irkutsk Institute for Engineers of Railway Transport,
ul. Chernyshevskogo 15, Irkutsk, 664074 Russia

**** Institute of Crystallography, University of Lausanne, BSP, Lausanne, 1015 Switzerland

Received September 19, 2002

Abstract—The three-dimensionally modulated incommensurate crystal structure of lazurite from the Baikal
region was determined for the first time. The structure was solved within the cubic system with the unit-cell
parameter a_cub = 9.077(1) Å and the (3+2)-dimensional superspace group Pnn2(q₁, q₂) under the assumption
of a twin model consisting of three orthorhombic components related by a threefold axis along the [111] direc-
tion. The structure was refined using 257 main reflections and 2392 first-order satellite reflections with the
isotropic thermal parameters to wR₀ = 1.98% and wR₁ = 7.50% respectively. © 2003 MAIK “Nauka/Interperi-
odica”.

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