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The crystal structure of vanthoffite {hexa-sodium magnesium tetra-kis[sulfate-(VI)]}, Na 6 Mg(SO 4 ) 4 , was solved in the year 1964 on a synthetic sample [Fischer &amp; Hellner (1964 ▸). Acta Cryst.  17 , 1613]. Here we report a redetermination of its crystal structure on a mineral sample with improved precision. It was refined in the space group P 2 1 / c from a crystal originating from Surtsey, Iceland. The unique Mg (site symmetry ) and the two S atoms are in usual, only slightly distorted octa-hedral and tetra-hedral coordinations, respectively. The three independent Na atoms are in a distorted octa-hedral coordination (1×) and distorted 7-coordinations inter-mediate between a 'split octa-hedron' and a penta-gonal bipyramid (2×). [MgO 6 ] coordination polyhedra inter-change with one half of the sulfate tetra-hedra in &lt;011&gt; chains forming a (100) meshed layer, with dimers formed by edge-sharing [NaO 7 ] polyhedra filling the inter-chain spaces. The other [NaO 7 ] polyhedra are organized in a parallel layer formed by [010] and [001] chains united through edge sharing and bonds to the remaining half of sulfate groups and to [NaO 6 ] octa-hedra. The two types of layers inter-connect through tight bonding, which explains the lack of morphological characteristics typical of layered structures.

Redetermination and new description of the crystal structure of vanthoffite, Na6Mg(SO4)4

Redetermination and new description of the crystal structure of vanthoffite, Na₆Mg(SO₄)₄