AM_Nepheline_1
Formula: K Na3 Si4 Al4 O16
Name: Nepheline
Unit cell: 10.01 10.01 8.405 90.0 90.0 120.0 , V=729.35
Space group: P63 (173)

Buerger M J , Klein G E , Donnay G , American Mineralogist , 39 (1954) p.805-818, Determination of the crystal structure of nepheline