data_global _chemical_name_mineral 'Diopside' loop_ _publ_author_name 'Secco L' 'Martignago F' 'Dal Negro A' 'Reznitskii L Z' 'Sklyarov E V' _journal_name_full 'American Mineralogist' _journal_volume 87 _journal_year 2002 _journal_page_first 709 _journal_page_last 714 _publ_section_title ; Crystal chemistry of Cr-V-rich clinopyroxenes Sample 2 ; _database_code_amcsd 0002807 _chemical_formula_sum 'Si1.988 Al.029 Cr.298 V.285 Mg.388 Fe.011 Mn.001 (Ca.413 Na.587) O6' _cell_length_a 9.6595 _cell_length_b 8.8263 _cell_length_c 5.2686 _cell_angle_alpha 90 _cell_angle_beta 106.596 _cell_angle_gamma 90 _cell_volume 430.476 _exptl_crystal_density_diffrn 3.437 _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 SiT 0.28932 0.09197 0.23203 0.99400 0.00455 AlT 0.28932 0.09197 0.23203 0.00600 0.00455 CrM1 0.00000 0.90580 0.25000 0.29800 0.00514 VM1 0.00000 0.90580 0.25000 0.28500 0.00514 MgM1 0.00000 0.90580 0.25000 0.38800 0.00514 AlM1 0.00000 0.90580 0.25000 0.01700 0.00514 FeM1 0.00000 0.90580 0.25000 0.01100 0.00514 MnM1 0.00000 0.90580 0.25000 0.00100 0.00514 CaM2 0.00000 0.30198 0.25000 0.41300 0.00914 NaM2 0.00000 0.30198 0.25000 0.58700 0.00914 O1 0.11451 0.08201 0.13990 1.00000 0.00718 O2 0.36058 0.25413 0.31074 1.00000 0.00857 O3 0.35176 0.01384 0.00207 1.00000 0.00738