AM_(Na75K25)AlGeO4_1 Formula: Na3 K Al4 Ge4 O16 Name: (Na.75K.25)AlGeO4 Unit cell: 10.0477 8.5764 10.2118 90.0 119.035 90.0 , V=769.39 Space group: P1211 (4)

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: monoclinic nepheline