Nepheline Buerger M, Klein G, Hamburger G Geological Society of America, Bulletin 57 (1946) 1182-1183 Structure of Nepheline _cod_database_code 1008761 _database_code_amcsd 0016638 10.05 10.05 8.38 90 90 120 P6_3 atom x y z Na1 0 0 0 Si1 1/3 2/3 .82 Al1 1/3 2/3 .18 O1 1/3 2/3 0 Na2 .01 .43 0 Si2 .09 1/3 1/3 Al2 .09 1/3 2/3 O2 .02 1/3 .5 O3 .17 .52 .75 O4 .17 .52 .25 O5 .25 .28 .25 O6 .25 .28 .75