AM_Nepheline_19
Formula: K.57 Na3.24 (Al3.84 Si4.16) O16
Name: Nepheline
Unit cell: 9.9751 9.9751 8.3658 90.0 90.0 120.0 , V=720.90
Space group: P63 (173)

Angel R J , Gatta G C , Boffa Ballaran T , Carpenter M A , The Canadian Mineralogist , 46 (2008) p.1465-1476, The mechanism of coupling in the modulated structure of nepheline, Locality: Snipe River, Tambani, Malawi, Note: annealed, Note: T = 220 K