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 = 100 C _database_code_amcsd 0003728 13.0666 13.0666 6.6632 90 90 90 I-42d atom x y z occ Uiso SiT1 0 0 0 .537 .0083 AlT1 0 0 0 .463 .0083 SiT2 .0560 .1336 .6220 .537 .0083 AlT2 .0560 .1336 .6220 .463 .0083 O1 .3888 .25 .125 .0155 O2 .1351 .0590 .4857 .0155 O3 .0516 .0943 .8664 .0155 Na .6923 .25 .125 .731 .0195 Ca .6923 .25 .125 .237 .0195 Wat4 .1287 .25 .125 .023 Wat5 .895 .25 .125 .185 .023