data_global _amcsd_formula_title 'Mg5 Na2 O30 Si12' loop_ _publ_author_name 'Nguyen N' 'Choisnet J' 'Raveau B' _journal_name_full 'Journal of Solid State Chemistry' _journal_volume 34 _journal_year 1980 _journal_page_first 1 _journal_page_last 9 _publ_section_title ; Silicates synthetiques a structure milarite _cod_database_code 1001138 ; _database_code_amcsd 0013397 _chemical_formula_sum 'Na2 Mg5 Si12 O30' _cell_length_a 10.151 _cell_length_b 10.151 _cell_length_c 14.288 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1275.028 _exptl_crystal_density_diffrn 2.564 _symmetry_space_group_name_H-M 'P 6/m c c' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-x+y,1/2+z' 'x,x-y,1/2-z' '-x+y,-x,-z' 'x-y,x,z' '-y,-x,1/2+z' 'y,x,1/2-z' 'y,-x+y,-z' '-y,x-y,z' 'x-y,-y,1/2+z' '-x+y,y,1/2-z' 'x,y,-z' '-x,-y,z' 'x,x-y,1/2+z' '-x,-x+y,1/2-z' 'x-y,x,-z' '-x+y,-x,z' 'y,x,1/2+z' '-y,-x,1/2-z' '-y,x-y,-z' 'y,-x+y,z' '-x+y,y,1/2+z' 'x-y,-y,1/2-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy Na1 0.00000 0.00000 0.25000 0.60000 Na2 0.33333 0.66667 0.00000 0.70000 Mg1 0.33333 0.66667 0.25000 1.00000 Mg2 0.50000 0.00000 0.25000 1.00000 Si1 0.76400 0.11600 0.11100 1.00000 O1 0.73000 0.12300 0.00000 1.00000 O2 0.94500 0.21300 0.13500 1.00000 O3 0.65200 0.15600 0.17100 1.00000