Genthelvite
Hassan I, Grundy H D
American Mineralogist 70 (1985) 186-192
The crystal structures of helvite group minerals, (MnFeZn)8(Be6Si6O24)S2
_database_code_amcsd 0000970
8.149 8.149 8.149 90 90 90 P-43n
atom     x     y     z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Zn   .1674 .1674 .1674  .0060  .0060  .0060  .0005  .0005  .0005
O    .1382 .1385 .4029  .0050  .0057  .0040  .0022  .0022  .0014
Be     .25     0    .5  .0066  .0053  .0053      0      0      0
Si     .25    .5     0  .0030  .0023  .0023      0      0      0
S        0     0     0  .0068  .0068  .0068      0      0      0