X-Ray crystal structure determinations of two sodium aluminates have shown Na5AlO4(orthorhombic, space group pbca) to contain discrete AlO4 tetrahedra and Na7Al3O8(triclinic, P![[1 with combining macron]](https://www.rsc.org/images/entities/char_0031_0304.gif)
) to contain a novel ring structure made up of six AlO4 tetrahedra which are linked by four oxygen bridges to form an infinite chain.
M. G. Barker, P. G. Gadd and M. J. Begley, J. Chem. Soc., Chem. Commun., 1981, 379 DOI: 10.1039/C39810000379
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