Synthetic shibkovite K(K1.67H2O0.33)(Ca1.3Na0.7)[Zn3Si12O30]: the crystal structure and comparative crystal chemistryстатья
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Дата последнего поиска статьи во внешних источниках: 2 апреля 2015 г.
Аннотация:The structure of a single crystal of a synthetic analog of mineral shibkovite
K(K1.67H2O0.33)(Ca1.3Na0.7)[Zn3Si12O30] (milarite structure type) obtained by hydrothermal synthesis in the AlPO4–K3PO4–CaCO3–Na2CO3–ZnCO3–SiO2–H2O system has been solved (R = 0.0406) by X-ray diffraction analysis: a = 10.5327(2) Å, c = 14.2019(3) Å, sp. gr. P6/mcc, Z = 2, and ρcalcd = 2.90 g/cm3. The crystalchemical features of the new phase are studied in comparison with the other terms of the milarite group. It is shown that the crystallization conditions for minerals and synthetic analogs of this group determine the presence or absence of crystallization water in the structures of compounds.