data_global _chemical_name_mineral 'Osumilite' loop_ _publ_author_name 'Seryotkin Y V' 'Sokol E V' 'Bakakin V V' 'Likhacheva A Y' _journal_name_full 'European Journal of Mineralogy' _journal_volume 20 _journal_year 2008 _journal_page_first 191 _journal_page_last 198 _publ_section_title ; Pyrometamorphic osumilite: occurrence, paragenesis, and crystal structure as compared to cordierite ; _database_code_amcsd 0007256 _chemical_compound_source 'South Urals, Russia' _chemical_formula_sum 'Si10.08 Al4.8 Fe.26 O30 Mg1.78 Mn.04 Ti.04 K.829 Na.104' _cell_length_a 10.0999 _cell_length_b 10.0999 _cell_length_c 14.3355 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1266.420 _exptl_crystal_density_diffrn 2.594 _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 SiT1 0.24852 0.35307 0.39220 0.84000 0.01050 AlT1 0.24852 0.35307 0.39220 0.16000 0.01050 AlT2 0.50000 0.50000 0.25000 0.96000 0.01290 FeT2 0.50000 0.50000 0.25000 0.04000 0.01290 O1 0.12200 0.40800 0.00000 1.00000 0.02060 O2 0.21650 0.28510 0.13129 1.00000 0.02540 O3 0.13905 0.49343 0.17921 1.00000 0.01430 MgA 0.33333 0.66667 0.25000 0.89000 0.01210 FeA 0.33333 0.66667 0.25000 0.07000 0.01210 MnA 0.33333 0.66667 0.25000 0.02000 0.01210 TiA 0.33333 0.66667 0.25000 0.02000 0.01210 KC 0.00000 0.00000 0.25000 0.82900 0.03620 NaB 0.33333 0.66667 0.01900 0.02600 0.05000