Helvine
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 0000974
8.291 8.291 8.291 90 90 90 P-43n
atom     x     y     z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Mn   .1709 .1709 .1709 .97  .0079  .0079  .0079  .0002  .0002  .0002
O    .1407 .1411 .4168      .0109  .0114  .0077  .0024  .0004 -.0024
Be     .25     0    .5      .0069  .0093  .0093      0      0      0
Si     .25    .5     0      .0062  .0077  .0077      0      0      0
S        0     0     0      .0112  .0112  .0112      0      0      0