Cu2 Mg3 Na2 O30 Si12 Nguyen N, Choisnet J, Raveau B Journal of Solid State Chemistry 34 (1980) 1-9 Silicates synthetiques a structure milarite _cod_database_code 1001139 _database_code_amcsd 0013398 10.096 10.096 14.25 90 90 120 P6/mcc atom x y z occ Na1 0 0 .25 .4 Na2 1/3 2/3 0 .8 Mg1 1/3 2/3 .25 .925 Mg2 .5 0 .25 .3833 Cu1 1/3 2/3 .25 .075 Cu2 .5 0 .25 .6167 Si1 .763 .109 .108 O1 .738 .137 0 O2 .942 .213 .138 O3 .665 .156 .164