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 = 23 deg C, P = 39.4 kbar, crystal 1 _database_code_amcsd 0002209 5.444 9.439 10.185 90 100.2 90 C2/m atom x y z occ Uiso Cs 0 .5 0 .89 .0165 Fe1 0 0 .5 .010 Fe2 0 .3327 .5 .0099 Si .0753 .1666 .2252 .76 .0121 Fe .0753 .1666 .2252 .23 .0121 Al .0753 .1666 .2252 .01 .0121 O1 .061 0 .173 .034 O2 .306 .249 .169 .030 O3 .131 .167 .394 .015 O4 .131 .5 .392 .010