Tuhualite Merlino S Science 166 (1969) 1399-1401 Tuhualite crystal structure Locality: Mayor Island, New Zealand Note: Position of H2O not determined in paper _database_code_amcsd 0015420 14.31 17.28 10.11 90 90 90 Cmca atom x y z Biso Fe1 .2484 0 0 1.1 Fe2 .25 -.0945 .25 .5 Si1 .3906 .1321 .0118 .7 Si2 .3894 .0704 .3060 .6 Si3 .3902 .1894 .5434 .5 O1 .3692 .2246 -.0094 1.1 O2 .3298 .0797 -.0876 .4 O3 .3643 .1105 .1619 1.5 O4 .3295 -.0051 .3370 .4 O5 .3639 .1358 .4107 1.1 O6 .3292 .1710 .6674 .9 O7 .5 .1130 -.0090 1.0 O8 .5 .0532 .3068 1.3 O9 .5 .1790 .5792 1.8 Na .25 .2197 .25 1.8