Tetra-ferri-annite Comodi P, Zanazzi P F, Weiss Z, Rieder M, Drabek M American Mineralogist 84 (1999) 325-332 "Cs-tetra-ferri-annite:" High-pressure and high-temperature behavior of a potential nuclear waste disposal phase T = 23 deg C after heating, crystal 2 _database_code_amcsd 0002207 5.452 9.448 10.786 90 99.77 90 C2/m atom x y z occ Uiso Cs 0 .5 0 .89 .0243 Fe1 0 0 .5 .0148 Fe2 0 .3393 .5 .0151 Si .0797 .1677 .2367 .76 .0142 Fe .0797 .1677 .2367 .23 .0142 Al .0797 .1677 .2367 .01 .0142 O1 .0588 0 .1843 .032 O2 .3130 .2483 .1812 .0324 O3 .1337 .1719 .3961 .0161 O4 .1373 .5 .4059 .0166