data_global _chemical_name_mineral 'Diopside' loop_ _publ_author_name 'Bindi L' 'Downs R T' 'Harlow G E' 'Safonov O G' 'Litvin Y A' 'Perchuk L L' 'Uchida H' 'Menchetti S' _journal_name_full 'American Mineralogist' _journal_volume 91 _journal_year 2006 _journal_page_first 802 _journal_page_last 808 _publ_section_title ; Compressibility of synthetic potassium-rich clinopyroxene: In situ high-pressure single-crystal X-ray study Sample: 939-1, P = 8.11 GPa ; _database_code_amcsd 0004151 _chemical_formula_sum '(Ca.88 K.12) Mg.83 Al.19 Si1.98 O6' _cell_length_a 9.5089 _cell_length_b 8.6937 _cell_length_c 5.1545 _cell_angle_alpha 90 _cell_angle_beta 105.344 _cell_angle_gamma 90 _cell_volume 410.921 _exptl_crystal_density_diffrn 3.505 _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 _atom_site_occupancy _atom_site_U_iso_or_equiv Ca2 0.00000 0.30530 0.25000 0.88000 0.01077 K2 0.00000 0.30530 0.25000 0.12000 0.01077 Mg1 0.00000 0.90910 0.25000 0.83000 0.00798 Al1 0.00000 0.90910 0.25000 0.17000 0.00798 Si 0.28630 0.09470 0.22470 0.99000 0.00684 Al 0.28630 0.09470 0.22470 0.01000 0.00684 O1 0.11360 0.08530 0.13850 1.00000 0.01203 O2 0.35940 0.25660 0.31550 1.00000 0.01241 O3 0.35290 0.02070 0.98730 1.00000 0.01026