data_global _chemical_name_mineral 'Diopside' loop_ _publ_author_name 'Dal Negro A' 'Manoli S' 'Secco L' 'Piccirillo E M' _journal_name_full 'European Journal of Mineralogy' _journal_volume 1 _journal_year 1989 _journal_page_first 105 _journal_page_last 121 _publ_section_title ; Megacrystic clinopyroxenes from Victoria (Australia): Crystal chemical comparisons of pyroxenes from high and low pressure regimes Sample: Fr-2 ; _database_code_amcsd 0006342 _chemical_compound_source 'Victoria, Australia' _chemical_formula_sum 'Ca.637 Na.159 Fe.29 Mg.647 Mn.004 Al.444 Ti.046 Cr.001 Si1.772 O6' _cell_length_a 9.693 _cell_length_b 8.837 _cell_length_c 5.279 _cell_angle_alpha 90 _cell_angle_beta 106.66 _cell_angle_gamma 90 _cell_volume 433.202 _exptl_crystal_density_diffrn 3.393 _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 CaM2 0.00000 0.29780 0.25000 0.63700 0.01507 NaM2 0.00000 0.29780 0.25000 0.15900 0.01507 FeM2 0.00000 0.29780 0.25000 0.14800 0.01507 MgM2 0.00000 0.29780 0.25000 0.05200 0.01507 MnM2 0.00000 0.29780 0.25000 0.00400 0.01507 AlM1 0.00000 0.90560 0.25000 0.21600 0.00760 FeM1 0.00000 0.90560 0.25000 0.14200 0.00760 MgM1 0.00000 0.90560 0.25000 0.59500 0.00760 TiM1 0.00000 0.90560 0.25000 0.04600 0.00760 CrM1 0.00000 0.90560 0.25000 0.00100 0.00760 SiT 0.28900 0.09260 0.23180 0.88600 0.00874 AlT 0.28900 0.09260 0.23180 0.11400 0.00874 O1 0.11380 0.08520 0.13790 1.00000 0.01191 O2 0.36350 0.25390 0.32160 1.00000 0.01494 O3 0.35210 0.01770 -0.00160 1.00000 0.01368