Geology of Ore Deposits

, Volume 49, Issue 7, pp 537–541 | Cite as

Crystal chemistry of selenates with mineral-like structures. III. Heteropolyhedral chains in the crystal structure of [Mg(H2O)4(SeO4)]2(H2O)

Article

Abstract

The crystal structure of a new compound [Mg(H2O)4(SeO4)]2(H2O) (monoclinic, P21/a, a = 7.2549(12), b = 20.059(5), c = 10.3934(17) Å, β = 101.989(13), V = 1479.5(5) Å3) has been solved by direct methods and refined to R1 = 0.059 for 2577 observed reflections with |Fhkl| ≥ 4σ|Fhkl|. The structure consists of [Mg(H2O)4(SeO4)]0 chains formed by alternating corner-sharing Mg octahedrons and (SeO4)2− tetrahedrons. O atoms of Mg octahedrons that are shared with selenate tetrahedrons are in a trans orientation. The heteropoly-hedral octahedral-tetrahedral chains are parallel to the c axis and undulate within the (010) plane. The adjacent chains are linked by hydrogen bonds involving H2O molecules not bound with M2+ cations.

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© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  1. 1.St. Petersburg State UniversitySt. PetersburgRussia

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