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Figure 1 (a) Rigid body group (RBG) and the coordinate systems defined for performing the movements of the RBG as a whole, are represented in the unit cell of the Fe1.59Zn1.41B7O13Br mixed boracite. (b) Atoms belonging to the RBG: some are labelled and the remainig are related by symmetry (there is a symmetry axis C3 crossing vertically the RBG). (c) Orthogonal coordinate system to perform the rotations of the RBG and orthonormal mol­ecular system.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 65| Part 11| November 2009| Pages i83-i84
https://doi.org/10.1107/S1600536809044407
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