data_global _chemical_name_mineral 'Kosmochlor' loop_ _publ_author_name 'Origlieri M J' 'Downs R T' 'Thompson R M' 'Pommier C J S' 'Denton M B' 'Harlow G E' _journal_name_full 'American Mineralogist' _journal_volume 88 _journal_year 2003 _journal_page_first 1025 _journal_page_last 1032 _publ_section_title ; High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes Sample: P = 1.14 GPa ; _database_code_amcsd 0003134 _chemical_formula_sum 'Na Cr Si2 O6' _cell_length_a 9.5439 _cell_length_b 8.6831 _cell_length_c 5.2517 _cell_angle_alpha 90 _cell_angle_beta 107.441 _cell_angle_gamma 90 _cell_volume 415.203 _exptl_crystal_density_diffrn 3.634 _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_U_iso_or_equiv Na2 0.00000 0.30060 0.25000 0.02280 Cr1 0.00000 0.90820 0.25000 0.01558 Si 0.29250 0.09210 0.23420 0.01634 O1 0.11440 0.07980 0.13800 0.01697 O2 0.36140 0.25830 0.30600 0.01773 O3 0.35270 0.01090 0.00700 0.01836