Vermiculite
Gruner J W
American Mineralogist 19 (1934) 557-575
The structures of vermiculites and their collapse by dehydration
Locality: Structure results from data of many samples
_database_code_amcsd 0000012
5.31 9.20 28.46 90 97.14 90 Cc
atom    x    y    z
Mg1     0    0    0
Mg2     0  1/3    0
Mg3     0  2/3    0
Si1  .397    0 .094
Si2  .897  1/6 .094
Si3  .603    0 .406
Si4  .103  1/6 .406
OH1  .858  5/6 .039
OH2  .142  5/6 .461
O1   .858   .5 .039
O2   .858  1/6 .039
O3   .161 1/12 .115
O4   .661 1/12 .115
O5   .911  1/3 .115
O6   .839 1/12 .385
O7   .339 1/12 .385
O8   .089  1/3 .385
O9   .142   .5 .461
O10  .142  1/6 .461