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 0000973
8.236 8.236 8.236 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)
Mn   .1687 .1687 .1687  .0082  .0082  .0082  .0018  .0018  .0018
O    .1393   .14 .4134  .0077  .0083  .0078  .0031  .0012  .0004
Be     .25     0    .5  .0085  .0074  .0074      0      0      0
Si     .25    .5     0  .0050  .0044  .0044      0      0      0
S        0     0     0  .0140  .0140  .0140      0      0      0