Vermiculite
Hendricks S B, Jefferson M E
American Mineralogist 23 (1938) 851-862
Crystal structure of vermiculites and mixed vermiculite-chlorites
_database_code_amcsd 0000019
5.33 9.18 28.85 90 93.25 90 Cc
atom     x     y     z
Mg1      0     0     0
Mg2      0   1/3     0
Mg3      0   2/3     0
OH1   .180    .5  .040
OH2  -.180   5/6 -.040
O1    .180   5/6  .040
O2   -.180    .5 -.040
O3    .180   1/6  .040
O4   -.180   1/6 -.040
O5   -.048   .75  .115
O6    .048 .5833 -.115
O7    .452   .75  .115
O8   -.452 .5833 -.115
O9    .202     0  .115
O10  -.202   1/3 -.115
Si1   .196   5/6  .095
Si2  -.196    .5 -.095
Si3  -.304   2/3  .095
Si4   .304   2/3 -.095