Merrihueite Khan A A, Baur W H, Forbes W C Acta Crystallographica B28 (1972) 267-272 Synthetic magnesian merrihueite, dipotassium pentamagnesium dodecasilicate: a tetrahedral magnesiosilicate framework crystal structure Locality: synthetic _database_code_amcsd 0009423 10.222 10.222 14.152 90 90 120 P6/mcc atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) K1 0 0 .25 .0032 .0032 .0023 .0016 0 0 K2 1/3 2/3 0 .5 .0028 .0028 .0018 .0014 0 0 Mg1 1/3 2/3 .25 .0016 .0016 .0014 .0008 0 0 Mg2 .5 0 .25 .0030 .0020 .0012 .0010 0 0 Si .1126 .3484 .1124 .0021 .0029 .0008 .0013 -.0001 -.0002 O1 .1239 .3788 0 .0062 .0062 .0009 .0032 0 0 O2 .2183 .2763 .1396 .0050 .0055 .0017 .0039 .0001 .0003 O3 .1551 .4968 .1708 .0032 .0029 .0014 .0015 -.0001 .0