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 5 ; _database_code_amcsd 0002810 _chemical_formula_sum 'Si1.982 Al.035 Cr.247 V.244 Mg.484 Fe.007 Mn.001 (Ca.51 Na.49) O6' _cell_length_a 9.6718 _cell_length_b 8.8412 _cell_length_c 5.2670 _cell_angle_alpha 90 _cell_angle_beta 106.483 _cell_angle_gamma 90 _cell_volume 431.874 _exptl_crystal_density_diffrn 3.411 _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 0.28887 0.09210 0.23163 0.99100 0.00464 AlT 0.28887 0.09210 0.23163 0.00900 0.00464 CrM1 0.00000 0.90565 0.25000 0.24700 0.00538 VM1 0.00000 0.90565 0.25000 0.24400 0.00538 MgM1 0.00000 0.90565 0.25000 0.48400 0.00538 AlM1 0.00000 0.90565 0.25000 0.01700 0.00538 FeM1 0.00000 0.90565 0.25000 0.00700 0.00538 MnM1 0.00000 0.90565 0.25000 0.00100 0.00538 CaM2 0.00000 0.30199 0.25000 0.51000 0.00932 NaM2 0.00000 0.30199 0.25000 0.49000 0.00932 O1 0.11467 0.08255 0.14007 1.00000 0.00736 O2 0.36041 0.25353 0.31131 1.00000 0.00880 O3 0.35161 0.01422 0.00118 1.00000 0.00765