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