Acta Cryst. (2006). E62, i196-i198  [ doi:10.1107/S1600536806033022 ]

Disodium nickel bis(sulfate) tetrahydrate: a nickel astrakanite

M. E. Díaz de Vivar, S. Baggio, M. T. Garland and R. Baggio

Abstract: The title compound, [Na₂Ni(SO₄)₂(H₂O)₄] or Ni astrakanite, is part of an isostructural family containing the Mg (the original astrakanite mineral), Zn and Co species. The very regular NiO(H₂O)₄O(SO₄)₂ octahedra lie at centers of symmetry, while the rather distorted NaO(H₂O)₂O(SO₄)₄ octahedra are at general positions, linked into a three-dimensional network by the bridging water molecules and fully coordinated sulfate groups.

Online 25 August 2006

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