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
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
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