data_global
_chemical_name_mineral 'Gedrite'
loop_
_publ_author_name
'Papike J J'
'Ross M'
_journal_name_full 'American Mineralogist'
_journal_volume 55 
_journal_year 1970
_journal_page_first 1945
_journal_page_last 1972
_publ_section_title
;
 Gedrites: Crystal structures and intracrystalline cation distributions
 sample 001
;
_database_code_amcsd 0000215
_chemical_formula_sum 'Si6.24 Al2.96 Mg4.48 Fe1.26 Ca.04 Na.36 O24'
_cell_length_a 18.531
_cell_length_b 17.741
_cell_length_c 5.249
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1725.653
_exptl_crystal_density_diffrn      3.188
_symmetry_space_group_name_H-M 'P n m a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,z'
  '-x,1/2+y,-z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  '1/2+x,y,1/2-z'
  '1/2-x,-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
Si1A   0.23150  -0.16310  -0.44870   0.66000   0.00545
Al1A   0.23150  -0.16310  -0.44870   0.34000   0.00545
Si1B   0.02020  -0.16450   0.29710   0.62000   0.00532
Al1B   0.02020  -0.16450   0.29710   0.38000   0.00532
Si2A   0.22780  -0.07600   0.05020   1.00000   0.00583
Si2B   0.02660  -0.08020  -0.19850   0.84000   0.00735
Al2B   0.02660  -0.08020  -0.19850   0.16000   0.00735
Mg1   0.12440   0.16110   0.37370   0.88000   0.00950
Fe1   0.12440   0.16110   0.37370   0.12000   0.00950
Al2   0.12480   0.07310  -0.12810   0.60000   0.00431
Mg2   0.12480   0.07310  -0.12810   0.36000   0.00431
Fe2   0.12480   0.07310  -0.12810   0.04000   0.00431
Mg3   0.12490   0.25000  -0.12480   0.90000   0.00595
Fe3   0.12490   0.25000  -0.12480   0.10000   0.00595
Mg4   0.11890  -0.01450   0.36360   0.55000   0.00798
Fe4   0.11890  -0.01450   0.36360   0.42000   0.00798
Ca4   0.11890  -0.01450   0.36360   0.02000   0.00798
Na4   0.11890  -0.01450   0.36360   0.01000   0.00798
Na   0.11510  -0.25000   0.85330   0.34000   0.01862
O1A   0.17960   0.16030   0.03120   1.00000   0.00507
O1B   0.06950   0.15840  -0.28600   1.00000   0.01165
O2A   0.18400   0.07370  -0.44360   1.00000   0.01330
O2B   0.06220   0.07420   0.18750   1.00000   0.00633
O3A   0.17970   0.25000  -0.45710   1.00000   0.01292
O3B   0.07000   0.25000   0.20870   1.00000   0.00950
O4A   0.18680   0.00220   0.04250   1.00000   0.00785
O4B   0.06790  -0.00460  -0.29850   1.00000   0.00937
O5A   0.19680  -0.10900   0.32060   1.00000   0.01343
O5B   0.05490  -0.10260   0.09430   1.00000   0.00912
O6A   0.20220  -0.13130  -0.17520   1.00000   0.00925
O6B   0.04720  -0.14500  -0.40970   1.00000   0.01887
O7A   0.20300  -0.25000   0.51380   1.00000   0.00823
O7B   0.04540  -0.25000   0.21530   1.00000   0.01659