Nepheline Gatta G D, Angel R J American Mineralogist 92 (2007) 1446-1455 Elastic behavior and pressure-induced structural evolution of nepheline: Implications for the nature of the modulated superstructure Locality: intrusive aplite of Snipe River, Tambani, Nyasaland, Malawi Sample: P = .0001 GPa, in DAC _database_code_amcsd 0004423 9.9910 9.9910 8.3702 90 90 120 P6_3 atom x y z occ Uiso K 0 0 .0051 .54 .032 NaK 0 0 .0051 .24 .032 CaK 0 0 .0051 .03 .032 Na .55384 .99711 .5071 .0239 AlT1 2/3 1/3 .7028 .0069 SiT2 2/3 1/3 .3144 .0173 SiT3 .90486 .66596 .82172 .0112 AlT4 .90743 .66818 .19535 .0128 O1 .6565 .2857 .5022 1/3 .0234 O2 .9740 .6844 .0021 .0244 O3 .8220 .4743 .2304 .0373 O4 .8393 .4905 .7526 .0198 O5 .7705 .7130 .8226 .0108 O6 .7787 .7369 .2016 .0274