data_global _chemical_name_mineral 'Chevkinite-(Ce)' loop_ _publ_author_name 'Sokolova E V' 'Hawthorne F C' 'Della Ventura G' 'Kartashov P M' _journal_name_full 'The Canadian Mineralogist' _journal_volume 42 _journal_year 2004 _journal_page_first 1013 _journal_page_last 1025 _publ_section_title ; Chevkinite-(Ce): Crystal structure and the effect of moderate radiation-induced damage on site-occupancy refinement Reported formula: (Ce1.85 La1.11 Nd.53 Pr.15 Sm.04 Gd.03 Ca.32 Th.02) (Fe2+.85 Mn2+.04 Zr.03 Y.03 Ca.05) (Ti2.54 Fe3+1.19 Nb.15) Si4.06 O22 Crystal (2) ; _database_code_amcsd 0005957 _chemical_compound_source 'Mongolia' _chemical_formula_sum 'Ce4 Fe3 Ti2 Si4 O22' _cell_length_a 13.534 _cell_length_b 5.789 _cell_length_c 11.159 _cell_angle_alpha 90 _cell_angle_beta 100.57 _cell_angle_gamma 90 _cell_volume 859.454 _exptl_crystal_density_diffrn 4.977 _symmetry_space_group_name_H-M 'C 1 2/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,z' '1/2+x,1/2-y,z' '-x,y,-z' '1/2-x,1/2+y,-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 CeA1 0.35496 0.00000 0.73642 0.02830 CeA2 0.06918 0.00000 0.74232 0.03160 Fe2+M1 0.50000 0.00000 0.50000 0.03470 Fe3+M2 0.25000 0.25000 0.00000 0.02310 TiM3 0.00000 0.00000 0.00000 0.02090 TiM4 0.50000 0.00000 0.00000 0.02660 Si1 0.20200 0.50000 0.73170 0.03700 Si2 0.35760 0.50000 0.54700 0.04160 O1 0.47760 0.25320 0.87440 0.02230 O2 0.14680 0.00000 0.97860 0.02000 O3 0.18270 0.00000 0.59570 0.02500 O4 0.34860 0.00000 0.98860 0.02100 O5 0.42470 0.27300 0.59850 0.03700 O6 0.22860 -0.73540 0.81380 0.01930 O7 0.08310 0.50000 0.67370 0.05200 O8 0.26540 0.50000 0.62540 0.05300 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 CeA1 0.03040 0.02480 0.03080 0.00000 0.00860 0.00000 CeA2 0.02420 0.04620 0.02540 0.00000 0.00730 0.00000 Fe2+M1 0.05300 0.02860 0.02340 0.00000 0.00950 0.00000 Fe3+M2 0.02840 0.02040 0.02060 0.00030 0.00450 0.00050 TiM3 0.02400 0.01900 0.02220 0.00000 0.00850 0.00000 TiM4 0.03010 0.02150 0.02770 0.00000 0.00410 0.00000 Si1 0.04100 0.03030 0.04000 0.00000 0.00880 0.00000 Si2 0.04600 0.04100 0.03800 0.00000 0.00930 0.00000 O1 0.02300 0.02600 0.02000 -0.00500 0.00780 -0.00600 O2 0.02100 0.01700 0.02300 0.00000 0.00600 0.00000 O3 0.03600 0.01900 0.01900 0.00000 0.00800 0.00000 O4 0.02400 0.01900 0.01900 0.00000 0.00500 0.00000 O5 0.04000 0.03700 0.03100 0.00300 -0.00500 0.01720 O6 0.03600 0.01000 0.01200 0.00000 0.00400 0.00300 O7 0.01600 0.08300 0.05300 0.00000 -0.00400 0.00000 O8 0.04400 0.08300 0.03900 0.00000 0.03000 0.00000