data_global _chemical_name_mineral 'Diopside' loop_ _publ_author_name 'Cameron M' 'Sueno S' 'Prewitt C T' 'Papike J J' _journal_name_full 'American Mineralogist' _journal_volume 58 _journal_year 1973 _journal_page_first 594 _journal_page_last 618 _publ_section_title ; High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite T = 850 C pyroxene ; _database_code_amcsd 0000343 _chemical_formula_sum 'Si2 Mg Ca O6' _cell_length_a 9.806 _cell_length_b 9.05 _cell_length_c 5.28 _cell_angle_alpha 90 _cell_angle_beta 106 _cell_angle_gamma 90 _cell_volume 450.418 _exptl_crystal_density_diffrn 3.193 _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 Si 0.28610 0.09250 0.22930 Mg1 0.00000 0.90660 0.25000 Ca2 0.00000 0.30030 0.25000 O1 0.11610 0.08630 0.14180 O2 0.36070 0.24680 0.31440 O3 0.34920 0.01510 0.99760 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 Si 0.01409 0.01631 0.01404 -0.00130 0.00364 -0.00126 Mg1 0.02125 0.02162 0.01630 0.00000 0.00441 0.00000 Ca2 0.03907 0.02162 0.02303 0.00000 -0.00131 0.00000 O1 0.01463 0.02668 0.02100 -0.00004 0.00405 0.00100 O2 0.03520 0.02124 0.02696 -0.00972 0.00623 -0.00186 O3 0.02102 0.03091 0.01951 0.00017 0.00664 -0.00817