Abstract
The reasons for the preference of glide planes in natural crystals are considered by studying the results of an X-ray crystallography analysis of the minerals salzburgite, eldragonite, izoklakeite, and vikingite. The glide planes organize the combination of right- of atomic fragments, which appear during crystallization, and contribute to a uniform distribution of atoms in complex compositions and a more dense and symmetrical packing. The fact that the structures have cation and anion sublattices with similar dimensions and orientations creates a situation similar to that of beats in oscillatory systems and, hence, modulates the intensity of X-ray reflections. The progressively increasing number of structures where individual atomic positions are occupied by two or more types of atoms suggests a stable geometry of the corresponding atomic sublattices with respect to compositional variations. Analysis of these “skeletal” sublattices is a key to understanding the solid-phase transformations, contact interactions, and dynamic processes in mineral associations.
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Devoted to the 80th anniversary of Professor S. P. Gabuda
Right- and left-handed atomic configurations, a subject of interest for Svyatoslav P. Gabuda, exist in inanimate as well as animate matter. This work shows how the specific nature of the symmetry of glide planes facilitates the combining of the right- and left-handed patterns. Unfortunately, it is no longer possible to discuss these results with Svyatoslav Petrovich...
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Translated from Zhurnal Strukturnoi Khimii, Vol. 57, No. 2, pp. 411-418, March-April, 2016.
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Borisov, S.V., Magarill, S.A. & Pervukhina, N.V. Crystal-forming functions of glide planes in the structural organization of a number of (Pb, Bi)-containing sulfides. J Struct Chem 57, 399–405 (2016). https://doi.org/10.1134/S0022476616020220
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DOI: https://doi.org/10.1134/S0022476616020220