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 = 400 C pyroxene ; _database_code_amcsd 0000360 _chemical_formula_sum 'Si2 Cr Na O6' _cell_length_a 9.597 _cell_length_b 8.751 _cell_length_c 5.274 _cell_angle_alpha 90 _cell_angle_beta 107.29 _cell_angle_gamma 90 _cell_volume 422.913 _exptl_crystal_density_diffrn 3.568 _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 0.29200 0.09180 0.23280 Cr1 0.00000 0.90720 0.25000 Na2 0.00000 0.30010 0.25000 O1 0.11390 0.07940 0.13690 O2 0.36070 0.25710 0.30120 O3 0.35210 0.00990 0.00620 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 0.00757 0.00698 0.01569 -0.00081 0.00477 -0.00033 Cr1 0.00825 0.00757 0.01575 0.00000 0.00458 0.00000 Na2 0.03058 0.01300 0.02337 0.00000 -0.00082 0.00000 O1 0.00949 0.01207 0.01936 -0.00134 0.00650 0.00022 O2 0.01497 0.00830 0.02679 -0.00544 0.00626 -0.00491 O3 0.01378 0.01463 0.02027 0.00150 0.00655 -0.00188