Sverigeite
Rouse R C, Peacor D R, Metz G W
American Mineralogist 74 (1989) 1343-1350
Sverigeite, a structure containing planar NaO4 groups and chains of 3- and
4-membered beryllosilicate rings
_database_code_amcsd 0001282
10.815 13.273 6.818 90 90 90 Imma
atom     x     y     z  occ  Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Sn       0     0     0            0.0040 0.0069 0.0023      0      0  .0004
Mn1    .25 .6291   .25 .685       0.0085 0.0071 0.0063      0 0.0008      0
Mg1    .25 .6291   .25 .315       0.0085 0.0071 0.0063      0 0.0008      0
Na       0     0    .5            0.0398 0.1453 0.0139      0      0 -.0124
Si1      0   .25 .8606            0.0003 0.0091 0.0027      0      0      0
Si2    .25 .0832   .25            0.0034 0.0077 0.0026      0 0.0009      0
Be   .6353   .25 .0262      .0051
O1   .7855 .1479 .4421      .0095
O2   .8664 .0021 .2130      .0082
O3   .1213   .25 .7211      .0047
O4       0 .3501 .9932      .0129
OH5      0   .25 .3834      .0180