data_global _chemical_name_mineral 'Osumilite' loop_ _publ_author_name 'Armbruster T' 'Oberhansli R' _journal_name_full 'American Mineralogist' _journal_volume 73 _journal_year 1988 _journal_page_first 585 _journal_page_last 594 _publ_section_title ; Crystal chemistry of double-ring silicates: Structural, chemical, and optical variation in osumilites Sample: Norway ; _database_code_amcsd 0001150 _chemical_formula_sum 'K.9 Fe.41 Mg1.68 Si10.32 Al4.59 O30' _cell_length_a 10.104 _cell_length_b 10.104 _cell_length_c 14.306 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1264.840 _exptl_crystal_density_diffrn 2.606 _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 KC 0.00000 0.00000 0.25000 0.90000 FeA 0.33333 0.66667 0.25000 0.16000 MgA 0.33333 0.66667 0.25000 0.84000 Si1 0.25010 0.35540 0.39210 0.86000 Al1 0.25010 0.35540 0.39210 0.14000 Fe2 0.50000 0.50000 0.25000 0.03000 Al2 0.50000 0.50000 0.25000 0.97000 O1 0.12380 0.40900 0.00000 1.00000 O2 0.21960 0.29110 0.13270 1.00000 O3 0.13830 0.49360 0.17890 1.00000 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 KC 0.02900 0.02900 0.03100 0.01450 0.00000 0.00000 FeA 0.00700 0.00700 0.00900 0.00350 0.00000 0.00000 MgA 0.00700 0.00700 0.00900 0.00350 0.00000 0.00000 Si1 0.00840 0.01000 0.00580 0.00460 0.00100 0.00100 Al1 0.00840 0.01000 0.00580 0.00460 0.00100 0.00100 Fe2 0.00910 0.00910 0.00680 0.00720 0.00000 0.00000 Al2 0.00910 0.00910 0.00680 0.00720 0.00000 0.00000 O1 0.02500 0.01700 0.00900 0.00400 0.00000 0.00000 O2 0.02900 0.04300 0.02100 0.03000 -0.00500 -0.00400 O3 0.01600 0.01600 0.01200 0.01000 -0.00300 -0.00500