data_global _chemical_name_mineral 'Diopside' loop_ _publ_author_name 'Warren B' 'Bragg W' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 69 _journal_year 1928 _journal_page_first 168 _journal_page_last 193 _publ_section_title ; The structure of diopside, Ca Mg (Si O3)2. _cod_database_code 1011057 ; _database_code_amcsd 0017958 _chemical_formula_sum 'Ca Mg Si2 O6' _cell_length_a 9.71 _cell_length_b 8.89 _cell_length_c 5.24 _cell_angle_alpha 90 _cell_angle_beta 74.16 _cell_angle_gamma 90 _cell_volume 435.151 _exptl_crystal_density_diffrn 3.305 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Ca1 0.00000 -0.30600 0.25000 Mg1 0.00000 0.08300 0.25000 Si1 0.21100 0.41200 0.23700 O1 0.37800 0.40300 0.13900 O2 0.14200 0.25000 0.32000 O3 0.15600 0.48000 0.00000