Tetraferriannite 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 = 296 deg C, crystal 2 _database_code_amcsd 0002211 5.480 9.500 10.907 90 99.60 90 C2/m atom x y z occ Uiso Cs 0 .5 0 .89 .0410 Fe1 0 0 .5 .0195 Fe2 0 .3319 .5 .0202 Si .0793 .1662 .2393 .76 .0184 Fe .0793 .1662 .2393 .23 .0184 Al .0793 .1662 .2393 .01 .0184 O1 .0615 0 .1849 .042 O2 .3146 .2503 .1864 .041 O3 .1325 .1667 .3965 .021 O4 .1325 .5 .4008 .025