data_global _chemical_name_mineral 'Sillimanite' loop_ _publ_author_name 'Taylor W' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 68 _journal_year 1928 _journal_page_first 503 _journal_page_last 521 _publ_section_title ; The structure of sillimanite and mullite. _cod_database_code 1011204 ; _database_code_amcsd 0018074 _chemical_formula_sum 'Al2 Si O5' _cell_length_a 7.43 _cell_length_b 7.58 _cell_length_c 5.74 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 323.273 _exptl_crystal_density_diffrn 3.329 _symmetry_space_group_name_H-M 'P b n m' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,y,1/2-z' '-x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Al1 0.00000 0.00000 0.00000 Al2 -0.14000 0.33000 0.25000 Si1 0.18000 -0.35000 0.25000 O1 0.11000 0.12000 0.25000 O2 -0.10000 -0.16000 0.25000 O3 0.08000 0.46000 0.25000 O4 0.15000 -0.18000 0.00000