Original paper

Crystal Structure Of Shomiokite-(Y), Na3Y(CO3)3 3H2O

Rastsvetaeva, Ramiza K.; Pushcharovsky, Dmitry Yu.; Pekov, Igor V.

European Journal of Mineralogy Volume 8 Number 6 (1997), p. 1249 - 1256

17 references

published: Jan 8, 1997
manuscript accepted: Jul 26, 1996
manuscript received: Feb 13, 1996

DOI: 10.1127/ejm/8/6/1249

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Abstract

Abstract Shomiokite, Na3Y(CO3)3 3H2O, M = 391.9, orthorhombic, space group Pna21, a = 17.358(8), b = 10.034(4), c = 5.946 (2) Å, V = 1035.6 Å3, Z = 4, p0 = 2.52, pc = 2.51 g/cm3, λ(MoKα) = 0.71073 Å, μ = 60.2 cm-1, dimensions (mm) 0.25 x 0.1 x 0.1, F(000) = 768, room temperature, R = 0.059 for 1973 reflections with |F|> 3σ(F). The structure contains isolated mixed complexes, formed by YO9 polyhedra, which share three edges with CO3 groups. The mixed complexes are considered as relicts of corrugated polyhedral layers, described in tengerite, kimuraite and lokkaite, and are connected through distorted Na octahedra, 5-fold polyhedra and a system of H-bonds.

Keywords

shomiokite-(Y)crystal structurecarbonate