data_global _chemical_name_mineral 'Osumilite' loop_ _publ_author_name 'Winter W' 'Armbruster T' 'Lengauer C' _journal_name_full 'European Journal of Mineralogy' _journal_volume 7 _journal_year 1995 _journal_page_first 277 _journal_page_last 286 _publ_section_title ; Crystal structure refinement of synthetic osumilite-type phases: BaMg2Al6Si9O30, SrMg2Al6Si9O30 and Mg2Al4Si11O30 Sample: CSr, SrMg2Al6Si9O30 ; _database_code_amcsd 0006586 _chemical_formula_sum 'Sr.91 Mg2 Si9.18 Al5.82 O30' _cell_length_a 10.1273 _cell_length_b 10.1273 _cell_length_c 14.2274 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1263.699 _exptl_crystal_density_diffrn 2.689 _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 _atom_site_U_iso_or_equiv SrC 0.00000 0.00000 0.25000 0.91000 0.04433 MgA 0.33333 0.66667 0.25000 1.00000 0.00431 SiT1 0.10430 0.34980 0.10970 0.76500 0.00861 AlT1 0.10430 0.34980 0.10970 0.23500 0.00861 AlT2 0.50000 0.50000 0.25000 1.00000 0.00608 O1 0.11950 0.39650 0.00000 1.00000 0.02191 O2 0.21200 0.27950 0.13650 1.00000 0.03432 O3 0.13770 0.49260 0.17720 1.00000 0.01469