AM_(Na75K25)AlGeO4 Formula: Na3.12 K.76 Al3.88 Ge4.12 O16 Name: (Na.75K.25)AlGeO4 Unit cell: 10.164 10.164 8.54 90.0 90.0 120.0 , V=764.04 Space group: P63 (173)

Hammond R P , Barbier J , Acta Crystallographica, Section B , 54 (1998) p.211-220, Monoclinic and hexagonal nepheline structures of (Na3/4K1/4)AlGeO4, Locality: synthetic, Note: hexagonal nepheline