Geology of Ore Deposits

, Volume 51, Issue 7, pp 663–667 | Cite as

Crystal chemistry of selenates with mineral-like structures: VII. The structure of (H3O)[(UO2)(SeO4)(SeO2OH)] and some structural features of selenite-selenates

Mineralogical Crystallography

Abstract

The crystal structure of a new compound, (H3O)[(UO2)(SeO4)(SeO2OH)] (monoclinic, P21/n, a = 8.6682(19), b = 10.6545(16), c = 9.846(2) Å, β = 97.881(17)°, V = 900.7(3) Å3), was solved by direct methods and refined to R1 = 0.050. The structure contains two symmetrically different Se atoms. The Se1 site is coordinated by three O atoms as is characteristic of Se4+ cations. The Se2 site is coordinated by four O atoms and forms selenate anion SeO42−. The structure is based on selenite-selenate sheets [(UO2)(SeO4)(SeO2OH)] linked by the interlayer H3O ions. The sheets are parallel to (101). The structure is compared to that of schmiederite, Pb2Cu2(SeO3)(SeO4)(OH)4.

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© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  1. 1.St. Petersburg State UniversitySt. PetersburgRussia

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