Seidite-(Ce) Ferraris G, Belluso E, Gula A, Soboleva S V, Khomyakov A P The Canadian Mineralogist 41 (2003) 1183-1192 The crystal structure of seidite-(Ce), Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4.5H2O, a modular microporous titanosilicate of the rhodesite group _database_code_amcsd 0005884 24.61 7.23 14.53 90 94.6 90 C2/c atom x y z occ Si1 .136 .008 .083 Si2 .126 .068 .870 Si3 .185 .254 .260 Si4 .183 .699 .212 Ti 0 0 0 .86 Nb 0 0 0 .06 Mn 0 0 0 .05 Fe 0 0 0 .02 Ce .195 .750 .960 .21 La .195 .750 .960 .15 Nd .195 .750 .960 .05 Pr .195 .750 .960 .02 Sm .195 .750 .960 .01 Sr .195 .750 .960 .27 Ca .195 .750 .960 .10 Th .195 .750 .960 .06 Na1 .061 .759 .215 .80 K1 .061 .759 .215 .07 Ba1 .061 .759 .215 .03 Na2 .159 .370 .045 .80 K2 .159 .370 .045 .07 Ba2 .159 .370 .045 .03 O1 .071 .966 .072 O2 .150 .048 .977 O3 .157 .204 .800 O4 .068 .102 .915 O5 .161 .807 .116 O6 .251 .225 .273 O7 .159 .134 .171 O8 .180 .475 .231 O9 .149 .885 .819 OH10 .987 .264 .036 Wat11 0 .473 .25 Wat12 0 .091 .25 Wat13 .062 .512 .043 O14 .265 .944 .932 Wat15 .25 .25 0 O16 .127 .514 .909 .11 OH16 .127 .514 .909 .40 F16 .127 .514 .909 .42