Acta Crystallographica Section B

Structural Science

Volume 54, Part 3 (June 1998)

research papers

Acta Cryst. (1998). B54, 211-220    [doi:10.1107/S0108768197013177]

Monoclinic and Hexagonal Nepheline Structures of (Na_3/4/K_1/4)AlGeO₄

R. P. Hammond and J. Barbier

Synopsis: Hexagonal (Na_3/4K_1/4)AlGeO₄ is isostructural with the mineral nepheline, (Na_3/4K_1/4)AlSiO₄, with a similar split oxygen position and a cation deficiency on the potassium site. In contrast, the alkali sites are fully occupied in the structure of monoclinic (Na_3/4K_1/4)AlGeO₄ and the lower unit-cell symmetry eliminates the oxygen disorder.

	Structure factor file (SHELXL table format) (78.9 kbytes) Supplementary material
	Structure factor file (SHELXL table format) (82.6 kbytes) Supplementary material

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