data_global _chemical_name_mineral 'Kosmochlor' loop_ _publ_author_name 'Cameron M' 'Sueno S' 'Prewitt C T' 'Papike J J' _journal_name_full 'American Mineralogist' _journal_volume 58 _journal_year 1973 _journal_page_first 594 _journal_page_last 618 _publ_section_title ; High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite T = 600 C pyroxene ; _database_code_amcsd 361 _chemical_formula_sum 'Si2 Cr Na O6' _cell_length_a 9.612 _cell_length_b 8.77 _cell_length_c 5.279 _cell_angle_alpha 90.0 _cell_angle_beta 107.25 _cell_angle_gamma 90.0 _cell_volume 424.989 _exptl_crystal_density_diffrn 3.55 _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 Si 0.2921 0.0912 0.2324 Cr1 0.0 0.9066 0.25 Na2 0.0 0.301 0.25 O1 0.114 0.0782 0.1362 O2 0.3611 0.2573 0.3025 O3 0.3519 0.0094 0.0074 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Si 0.00909 0.00994 0.01339 -0.00102 0.00485 -0.00031 Cr1 0.01003 0.0083 0.0142 0.0 0.00424 0.0 Na2 0.04004 0.01664 0.02802 0.0 -0.00209 0.0 O1 0.00781 0.01504 0.0142 -0.00131 0.00598 0.00148 O2 0.01908 0.00997 0.02678 -0.00657 0.00872 -0.00211 O3 0.01315 0.01742 0.01913 -0.0011 0.00549 -0.00643