Tetranatrolite Lee Y, Hriljac J A, Vogt T American Mineralogist 90 (2005) 247-251 Variable-temperature structural studies of tetranatrolite from Mt. Saint-Hilaire: Synchrotron X-ray powder diffraction and Rietveld analysis Sample: T = 200 C _database_code_amcsd 0003729 12.9815 12.9815 6.6808 90 90 90 I-42d atom x y z occ Uiso SiT1 0 0 0 .537 .0119 AlT1 0 0 0 .463 .0119 SiT2 .0564 .1340 .6224 .537 .0119 AlT2 .0564 .1340 .6224 .463 .0119 O1 .3842 .25 .125 .0206 O2 .1356 .0591 .4881 .0206 O3 .0533 .0950 .8650 .0206 Na .6925 .25 .125 .731 .0240 Ca .6925 .25 .125 .237 .0240 Wat4 .1258 .25 .125 .027 Wat5 .942 .25 .125 .051 .027