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 (2an) ; _database_code_amcsd 0005958 _chemical_compound_source 'Mongolia' _chemical_formula_sum 'Ce4 Fe2.04 Ca.05 Mn.04 Y.03 Zr.03 Ti2.57 Nb.16 Si4 O22' _cell_length_a 13.400 _cell_length_b 5.7232 _cell_length_c 11.0573 _cell_angle_alpha 90 _cell_angle_beta 100.537 _cell_angle_gamma 90 _cell_volume 833.694 _exptl_crystal_density_diffrn 5.124 _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_occupancy _atom_site_U_iso_or_equiv CeA1 0.35648 0.00000 0.73698 1.00000 0.01460 CeA2 0.07064 0.00000 0.74336 1.00000 0.01770 Fe2+M1 0.50000 0.00000 0.50000 0.85000 0.01190 CaM1 0.50000 0.00000 0.50000 0.05000 0.01190 MnM1 0.50000 0.00000 0.50000 0.04000 0.01190 YM1 0.50000 0.00000 0.50000 0.03000 0.01190 ZrM1 0.50000 0.00000 0.50000 0.03000 0.01190 Fe3+M2 0.25000 0.25000 0.00000 0.59500 0.01000 TiM2 0.25000 0.25000 0.00000 0.28500 0.01000 NbM2 0.25000 0.25000 0.00000 0.08000 0.01000 TiM3 0.00000 0.00000 0.00000 1.00000 0.01630 TiM4 0.50000 0.00000 0.00000 1.00000 0.01560 Si1 0.20200 0.50000 0.73120 1.00000 0.02650 Si2 0.35960 0.50000 0.54420 1.00000 0.03020 O1 0.47810 0.25220 0.87320 1.00000 0.01090 O2 0.14670 0.00000 0.97860 1.00000 0.00900 O3 0.18720 0.00000 0.59630 1.00000 0.01200 O4 0.34780 0.00000 0.98860 1.00000 0.00480 O5 0.42790 0.26900 0.59050 1.00000 0.02100 O6 0.22770 -0.73600 0.81420 1.00000 0.00980 O7 0.08510 0.50000 0.66600 1.00000 0.02800 O8 0.27340 0.50000 0.63080 1.00000 0.03400 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 0.01620 0.01500 0.01290 0.00000 0.00310 0.00000 CeA2 0.01280 0.02630 0.01290 0.00000 -0.00050 0.00000 Fe2+M1 0.01410 0.01510 0.00490 0.00000 -0.00220 0.00000 CaM1 0.01410 0.01510 0.00490 0.00000 -0.00220 0.00000 MnM1 0.01410 0.01510 0.00490 0.00000 -0.00220 0.00000 YM1 0.01410 0.01510 0.00490 0.00000 -0.00220 0.00000 ZrM1 0.01410 0.01510 0.00490 0.00000 -0.00220 0.00000 Fe3+M2 0.01290 0.01100 0.00550 -0.00030 0.00040 0.00010 TiM2 0.01290 0.01100 0.00550 -0.00030 0.00040 0.00010 NbM2 0.01290 0.01100 0.00550 -0.00030 0.00040 0.00010 TiM3 0.01400 0.02479 0.01000 0.00000 0.00230 0.00000 TiM4 0.01200 0.02200 0.01100 0.00000 -0.00120 0.00000 Si1 0.03000 0.02480 0.02400 0.00000 0.00310 0.00000 Si2 0.03200 0.03200 0.02520 0.00000 0.00270 0.00000 O1 0.00700 0.01700 0.00900 -0.00300 0.00000 -0.00300 O2 0.00900 0.00800 0.00900 0.00000 0.00000 0.00000 O3 0.02100 0.01300 0.00000 0.00000 0.00100 0.00000 O4 0.00300 0.00700 0.00400 0.00000 -0.00200 0.00000 O5 0.01900 0.03000 0.01200 0.00800 0.00000 0.01000 O6 0.02100 0.00600 0.00300 0.00100 0.00200 0.00100 O7 0.00600 0.04800 0.02400 0.00000 -0.01000 0.00000 O8 0.02700 0.05400 0.02800 0.00000 0.02500 0.00000