data_global _chemical_name_mineral 'Vladykinite' loop_ _publ_author_name 'Chakhmourdian A R' 'Cooper M A' 'Ball N' 'Reguir E P' 'Medici L' 'Abdu Y A' 'Antonov A A' _journal_name_full 'American Mineralogist' _journal_volume 99 _journal_year 2014 _journal_page_first 235 _journal_page_last 241 _publ_section_title ; Vladykinite, Na3Sr4(Fe2+Fe3+)Si8O24: A new complex sheet silicate from peralkaline rocks of the Murun complex, eastern Siberia, Russia ; _database_code_amcsd 0020023 _chemical_compound_source 'Murun complex, eastern Siberia, Russia' _chemical_formula_sum 'Na2.45 Ca.55 Sr3.84 K.04 La.02 Ce.01 Fe1.41 Mn.26 Zn.16 Al.12 Mg.05 Ti.01 Si8 O24' _cell_length_a 5.21381 _cell_length_b 7.9143 _cell_length_c 26.0888 _cell_angle_alpha 90 _cell_angle_beta 90.3556 _cell_angle_gamma 90 _cell_volume 1076.499 _exptl_crystal_density_diffrn 3.510 _symmetry_space_group_name_H-M 'P 1 21/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,1/2+z' '-x,1/2+y,1/2-z' '-x,-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 Na1 0.50000 0.50000 0.50000 1.00000 0.02780 Na2 0.48483 0.44221 0.63351 0.72500 0.02100 Ca2 0.48483 0.44221 0.63351 0.27500 0.02100 Sr1 0.49578 0.90294 0.57005 1.00000 0.01107 Sr2 0.50609 0.58890 0.77700 0.92000 0.01184 K2 0.50609 0.58890 0.77700 0.02000 0.01184 La2 0.50609 0.58890 0.77700 0.01000 0.01184 Ce2 0.50609 0.58890 0.77700 0.00500 0.01184 Fe2+ 0.00453 0.75589 0.67545 0.37500 0.01134 Fe3+ 0.00453 0.75589 0.67545 0.33000 0.01134 Mn 0.00453 0.75589 0.67545 0.13000 0.01134 Zn 0.00453 0.75589 0.67545 0.08000 0.01134 Al 0.00453 0.75589 0.67545 0.06000 0.01134 Mg 0.00453 0.75589 0.67545 0.02500 0.01134 Ti 0.00453 0.75589 0.67545 0.00500 0.01134 Si1 0.94527 0.39083 0.71424 1.00000 0.01073 Si2 0.95867 0.10612 0.63401 1.00000 0.01018 Si3 0.05166 0.23197 0.53140 1.00000 0.00944 Si4 0.02973 0.60042 0.56752 1.00000 0.00895 O1 0.24940 0.39304 0.71818 1.00000 0.01750 O2 0.80520 0.56879 0.70091 1.00000 0.01800 O3 0.79630 0.32075 0.76480 1.00000 0.01700 O4 0.84110 0.26336 0.66773 1.00000 0.01690 O5 0.74120 0.58495 0.86101 1.00000 0.02090 O6 0.79210 -0.05618 0.65173 1.00000 0.01610 O7 0.86480 0.14346 0.57432 1.00000 0.01380 O8 0.28520 0.11891 0.51492 1.00000 0.01550 O9 0.15520 0.41060 0.55787 1.00000 0.01310 O10 0.13580 0.71048 0.51702 1.00000 0.01300 O11 0.72750 0.60334 0.57060 1.00000 0.01400 O12 0.18810 0.67881 0.61515 1.00000 0.01450 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 Na1 0.01250 0.04640 0.02440 -0.00510 0.00380 -0.01740 Na2 0.01100 0.03660 0.01530 0.00680 0.00110 0.01300 Ca2 0.01100 0.03660 0.01530 0.00680 0.00110 0.01300 Sr1 0.01124 0.01049 0.01149 0.00041 0.00051 -0.00036 Sr2 0.01087 0.01313 0.01153 0.00114 0.00042 -0.00075 K2 0.01087 0.01313 0.01153 0.00114 0.00042 -0.00075 La2 0.01087 0.01313 0.01153 0.00114 0.00042 -0.00075 Ce2 0.01087 0.01313 0.01153 0.00114 0.00042 -0.00075 Fe2+ 0.01494 0.00987 0.00921 0.00097 0.00026 0.00018 Fe3+ 0.01494 0.00987 0.00921 0.00097 0.00026 0.00018 Mn 0.01494 0.00987 0.00921 0.00097 0.00026 0.00018 Zn 0.01494 0.00987 0.00921 0.00097 0.00026 0.00018 Al 0.01494 0.00987 0.00921 0.00097 0.00026 0.00018 Mg 0.01494 0.00987 0.00921 0.00097 0.00026 0.00018 Ti 0.01494 0.00987 0.00921 0.00097 0.00026 0.00018 Si1 0.00941 0.01030 0.01253 -0.00032 0.00084 -0.00214 Si2 0.00984 0.01190 0.00877 0.00098 0.00032 -0.00105 Si3 0.01026 0.00856 0.00950 0.00120 0.00122 0.00102 Si4 0.00852 0.00870 0.00961 0.00019 0.00013 0.00002 O1 0.01100 0.01940 0.02190 -0.00130 -0.00050 -0.00470 O2 0.01590 0.01310 0.02490 0.00200 0.00170 0.00000 O3 0.01500 0.01750 0.01850 -0.00080 0.00470 -0.00040 O4 0.01180 0.01930 0.01980 0.00100 -0.00010 -0.00930 O5 0.01210 0.03490 0.01570 -0.00690 -0.00090 0.00550 O6 0.01780 0.01560 0.01510 -0.00100 0.00200 0.00150 O7 0.01310 0.01750 0.01070 -0.00370 -0.00090 0.00190 O8 0.01680 0.01680 0.01310 0.00740 0.00280 0.00100 O9 0.01270 0.00900 0.01770 0.00050 -0.00010 -0.00120 O10 0.01190 0.01400 0.01330 0.00000 0.00070 0.00360 O11 0.01000 0.01700 0.01500 -0.00010 0.00070 0.00000 O12 0.01400 0.01520 0.01430 -0.00100 -0.00260 -0.00170