Richterite
Senda K, Ishida K, Jenkins D M
American Mineralogist 90 (2005) 1062-1071
X-ray Rietveld refinement and FTIR spectra of synthetic (Si,Ge)-richterites
Sample: Ge6Ri, Si24Ge76
_database_code_amcsd 0003795
10.2255 18.2144 5.3683 90 105.555 90 C2/m
atom     x     y     z  occ Biso
NaA     .0    .5    .0  .46 2.68
Ca4     .0 .2758    .5  .44 1.58
Na4     .0 .2758    .5  .56 1.58
Mg1     .0 .0868    .5       .47
Mg2     .0 .1776    .0       .61
Mg3     .0    .0    .0       .42
Si1  .2796 .0853 .3064  .31  .51
Ge1  .2796 .0853 .3064  .69  .51
Si2  .2861 .1739 .8122  .17  .50
Ge2  .2861 .1739 .8122  .83  .50
O1    .108 .0848  .221       .69
O2    .114 .1698  .727       .64
OH3   .107    .0  .719       .64
O4    .363 .2503  .781       .96
O5    .349 .1388  .135       .86
O6    .345 .1049  .629       .84
O7    .340    .0  .258       .93