Mineral structures have always represented a treasure trove for new discoveries in crystallography. For example, in the field of aperiodic crystallography, the mineral calaverite (Au1−xAgxTe2, with 0≤x≤0.33) was an ideal case to begin to shed light on incommensurability in crystals . Later, mineralogy played an important role with numerous examples of mineral structures exhibiting non-commensurate (misfit) layer structures , currently known under the name of composite structures, and in providing the first example of a (billion years old) natural quasicrystal , which settled any doubt that could remain on the long-term stability of quasicrystals.The special issue of the Zeitschrift für Kristallographie on the complexity of mineral structures contains 10 contributions. While the first three articles are more general (intrinsic aspects of structural complexity), or methodological (electron diffraction tomography) or deal with more theoretical aspects of crystallography (structure description based on the sphere packing), the other seven articles are related to structure solutions of complicated, still unknown mineral structures. These papers include solutions and refinements of structures of silicates [swamboite-(Nd) and seidozerite-supergroup minerals], uranyl sulfates/selenates, sulfosalts (roshchinite, zinkenite, and semseyite), and tellurides (stützite). There are examples of modulated mineral structures deciphered with multidimensional structure refinements in superspace [swamboite-(Nd) and roshchinite],
Zeitschrift für Kristallographie - Crystalline Materials – de Gruyter
Published: Mar 28, 2018
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