data_global
_chemical_name_mineral 'Fenaksite'
loop_
_publ_author_name
'Rozhdestvenskaya I V'
'Bannova I I'
'Nikishova L V'
'Soboleva T V'
_journal_name_full 'Doklady Earth Sciences'
_journal_volume 398 
_journal_year 2004
_journal_page_first 1029
_journal_page_last 1033
_publ_section_title
;
 The crystal structure of fenaksite K2Na2Fe2Si8O20
;
_database_code_amcsd 0012511
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'K Na Fe Si4 O10'
_cell_length_a 8.142
_cell_length_b 9.954
_cell_length_c 6.983
_cell_angle_alpha 100.21
_cell_angle_beta 114.13
_cell_angle_gamma 105.87
_cell_volume 469.098
_exptl_crystal_density_diffrn      2.763
_symmetry_space_group_name_H-M 'P -1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
K   0.20125   0.00942   0.34106   0.02090
Na   0.14350   0.41038   0.66600   0.02290
Fe   0.10795   0.40673   0.15634   0.00999
Si1   0.35852   0.72997   0.12574   0.00796
Si2   0.35887   0.72840   0.55640   0.00859
Si3   0.17367   0.86816   0.79338   0.00833
Si4   0.69635   0.78618   0.03015   0.00750
O1   0.54960   0.71120   0.11970   0.01650
O2   0.32570   0.86531   0.03260   0.01310
O3   0.42150   0.79400   0.38740   0.01400
O4   0.16970   0.58196   0.99530   0.01140
O5   0.21840   0.56020   0.45680   0.01780
O6   0.43310   0.23020   0.22720   0.01710
O7   0.74640   0.16600   0.38160   0.01720
O8   0.04380   0.23950   0.29940   0.01540
O9   0.81010   0.96193   0.17440   0.01660
O10   0.85530   0.71690   0.06850   0.01240
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
K 0.01440 0.02110 0.02670 0.00604 0.00859 0.01080
Na 0.04140 0.01220 0.01460 0.00610 0.01530 0.00580
Fe 0.01053 0.00853 0.01067 0.00341 0.00556 0.00201
Si1 0.00860 0.00840 0.00710 0.00258 0.00432 0.00301
Si2 0.00970 0.00860 0.00660 0.00238 0.00415 0.00198
Si3 0.01020 0.00600 0.00890 0.00332 0.00454 0.00243
Si4 0.00800 0.00630 0.00860 0.00310 0.00425 0.00228
O1 0.01590 0.02060 0.02490 0.01040 0.01560 0.01410
O2 0.01500 0.01000 0.01130 0.00400 0.00370 0.00510
O3 0.01650 0.01410 0.00760 0.00020 0.00690 0.00210
O4 0.01040 0.00840 0.01250 0.00250 0.00400 0.00280
O5 0.02450 0.00940 0.01220 0.00170 0.00900 0.00050
O6 0.01380 0.02560 0.00910 0.00730 0.00320 0.00580
O7 0.02350 0.02260 0.01590 0.01550 0.01370 0.00890
O8 0.01170 0.01200 0.01900 0.00120 0.00560 0.00710
O9 0.01560 0.00620 0.01990 0.00430 0.00240 0.00120
O10 0.01280 0.01210 0.01530 0.00800 0.00770 0.00390