Combeite
Ohsato H, Takeuchi Y, Maki I
Acta Crystallographica C42 (1986) 934-937
Structure of Na4Ca4[Si6O18]
Locality: synthetic low-temperature form
_database_code_amcsd 0010031
10.464 10.464 13.168 90 90 120 P3_121
atom        x     y      z occ Biso
Na1     .3086 .9830  .5892 .42  .59
Ca1     .3086 .9830  .5892 .29  .59
Nal'    .2821 .9704  .6151 .17  2.6
Cal'    .2821 .9704  .6151 .12  2.6
Na2     .5041 .3380  .6642     1.69
Ca31    .5262 .3704  .1558 .59 1.56
Na31    .5262 .3704  .1558 .41 1.56
Ca32    .8203     0    5/6      .76
Ca4     .3039     0    1/3      .59
Sil     .1986 .1526  .7780      .46
Si2     .4996 .3234  .8958      .54
Si3     .6243 .1485  .7635      .50
O11     .1671     0    5/6      1.4
O12     .5555     0    5/6      1.6
O13     .3442 .2842  .8382      .90
O14     .5849 .2643  .8199     1.05
O21     .2468 .1535  .6622     1.09
O22     .4782 .2472  .0032     1.22
O23     .5513 .1104  .6540     1.38
O31     .0652 .1853  .7949      .79
O32     .5965 .4991  .8880     1.38
O33     .7990 .2184  .7763     1.07