Agrellite
Rozhdestvenskaya I V, Nikishova L V
Crystallography Reports 43 (1998) 589-597
Crystal structure of Na(Ca,Sr)2Si4O10F strontium agrellite from
Yakutian charoitites: agrellite polytypes
Locality: Sirenevyi Kamen deposit, Murunskii massif, Yakutia, Russia
_database_code_amcsd 0019049
7.788 18.941 6.995 90.17 116.78 94.16 P-1
atom     x     y     z  occ Biso
Ca1A .0068 .2188 .0023  .70  1.6
Sr1A .0068 .2188 .0023  .30  1.6
Ca1B .5392 .2842 .0231  .86   .8
Na1B .5392 .2842 .0231  .14   .8
Ca2A .4491 .7203 .4754  .90  .86
Na2A .4491 .7203 .4754  .10  .86
Ca2B .9988 .7847 .4942       2.0
Si1A  .208 .9287  .375       2.2
Si1B .3073 .5660 .1560        .9
Si2A  .486 .8753  .215       1.7
Si2B .0233 .6181 .2932        .6
Si3A .8342 .9107 .6671       1.0
Si3B .6755 .5921  .834       1.6
Si4A .4866 .8793 .7673       1.5
Si4B .0255 .6209 .7285       1.5
NaA   .235 .0082  .868 1.03  2.6
NaB   .261 .5035  .628  .86  2.7
FA    .756 .7607  .131       4.0
FB    .214 .2438  .375       1.1
O1A   .359 .9384  .619        .7
O1B   .181 .5693  .902       2.4
O2A   .097 .0072  .293        .5
O2B   .403 .4960  .199       2.2
O3A   .348 .9354  .228       3.1
O3B   .162 .5647  .266        .8
O4A   .062  .865  .277        .9
O4B   .455 .6366  .225       1.9
O5A   .386 .7961  .189        .9
O5B   .100 .6954  .314        .7
O6A   .510  .906  .009       3.1
O6B   .000 .5888  .500       1.1
O7A   .698 .8925  .412       1.4
O7B   .821 .6018  .107       1.9
O8A   .021 .8722  .761       2.0
O8B   .496 .6376  .748       1.0
O9A   .703 .8930  .793        .7
O9B   .814  .596  .713       5.7
O10A  .406 .8020  .698       1.6
O1OB  .114 .7016  .785       .43