Crystal structure of zdenekite NaPbCu5(AsO4)4Cl · 5H2O |
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| Authors: | N. V. Zubkova D. Yu. Pushcharovsky H. Sarp S. J. Teat E. J. MacLean |
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| Affiliation: | (1) Department of Geology, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia;(2) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia;(3) Department of Mineralogy, Museum of Natural History of Geneva, route de Malagnou 1, CH-1208 Geneva, Switzerland;(4) CCLRC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, Cheshire, UK |
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| Abstract: | The crystal structure of the mineral zdenekite NaPbCu5(AsO4)4Cl · 5H2O was established (Bruker SMART CCD diffractometer, synchrotron radiation, λ = 0.6843Å, R = 0.096 for 1356 reflections). Single-crystal X-ray diffraction study demonstrated that zdenekite belongs to the monoclinic system with the unit-cell parameters a = 10.023(7) Å, b = 19.55(1) Å, c = 10.023(6) Å, β = 90.02(1)°, sp. gr. P21/n, Z = 4. The structure consists of polyhedral layers parallel to the (010) plane. These layers are formed by Cu? polyhedra φ = O, Cl, H2O) and AsO4 tetrahedra. Distorted Na octahedra and Pb 7-vertex polyhedra and H2O molecules coordinated to these metal atoms are located between the layers. |
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