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

Article

Abstract

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 R1 = 0.033 on the basis of 1076 observed reflections with |Fhkl| ≥ 4σ|Fhkl|. 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.

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© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  1. 1.St. Petersburg State UniversitySt. PetersburgRussia

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