Geology of Ore Deposits

, Volume 49, Issue 7, pp 542–546 | Cite as

Crystal chemistry of selenates with mineral-like structures. IV. Crystal structure of Zn(SeO4)(H2O)2, a new compound with a mixed framework of the variscite type



The crystal structure of a new compound Zn(SeO4)(H2O)2 (orthorhombic, Pbca, a = 9.0411(13), b = 10.246(2), c = 10.3318(15) Å, V = 957.1(3) Å3) has been solved by direct methods and refined to R 1 = 0.033 on the basis of 1076 observed reflections with |F hkl | ≥ 4σ|F hkl |. The structure contains one independent Zn2+ cation coordinated by two water molecules and four oxygen atoms of selenate group. The only independent (SeO4)2− tetrahedral oxoanion is tetradentate, sharing its corners with four adjacent [Zn2+O2(H2O4)]2+ octahedrons. The structure can be described as consisting of heteropolyhedral sheets parallel to the (001) plane and linked together into a three-dimensional network. The compound belongs to the variscite structure type and is the first structurally characterized selenate of this group.


Crystal Chemistry Image Plate Detector Selenate Group STOE IPDS Anion Bond 


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© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  1. 1.St. Petersburg State UniversitySt. PetersburgRussia

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