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 0000969
8.109 8.109 8.109 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   .1668 .1668 .1668  .0059  .0059  .0059  .0003  .0003  .0003
O    .1377 .1381  .406  .0067  .0077  .0038  .0027 -.0015 -.0024
Be     .25     0    .5  .0024  .0079  .0079      0      0      0
Si     .25    .5     0  .0033   .004  .0040  .0000      0      0
S        0     0     0  .0065  .0065  .0065  .0000      0      0