data_global _chemical_name_mineral 'Natalyite' 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 3 ; _database_code_amcsd 0002808 _chemical_formula_sum 'Si1.986 Al.04 Cr.165 V.403 Mg.402 Fe.003 Ti.001 (Ca.418 Na.582) O6' _cell_length_a 9.6631 _cell_length_b 8.8263 _cell_length_c 5.2709 _cell_angle_alpha 90 _cell_angle_beta 106.601 _cell_angle_gamma 90 _cell_volume 430.814 _exptl_crystal_density_diffrn 3.424 _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 0.28940 0.09181 0.23283 0.99300 0.00410 AlT 0.28940 0.09181 0.23283 0.00700 0.00410 CrM1 0.00000 0.90538 0.25000 0.16500 0.00506 VM1 0.00000 0.90538 0.25000 0.40300 0.00506 MgM1 0.00000 0.90538 0.25000 0.40200 0.00506 AlM1 0.00000 0.90538 0.25000 0.02600 0.00506 FeM1 0.00000 0.90538 0.25000 0.00300 0.00506 TiM1 0.00000 0.90538 0.25000 0.00100 0.00506 CaM2 0.00000 0.30170 0.25000 0.41800 0.00973 NaM2 0.00000 0.30170 0.25000 0.58200 0.00973 O1 0.11481 0.08181 0.14013 1.00000 0.00675 O2 0.36049 0.25395 0.31026 1.00000 0.00806 O3 0.35154 0.01331 0.00309 1.00000 0.00694