data_global
_chemical_name_mineral 'Arapovite'
loop_
_publ_author_name
'Uvarova Y A'
'Sokolova E V'
'Hawthorne F C'
'Agakhanov A A'
'Pautov L A'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 42 
_journal_year 2004
_journal_page_first 1005
_journal_page_last 1011
_publ_section_title
;
 The crystal structure of arapovite, U4+(Ca,Na)2(K1-x_x)[Si8O20],x~0.5,
 a new mineral species of the steacyite group from the Dara-i-Pioz moraine,
 Tien-Shan Mountains, Tajikistan
;
_database_code_amcsd 0005955
_chemical_compound_source 'Dara-i-Pioz moraine, Tien-Shan Mountains, Tajikistan'
_chemical_formula_sum 'U.59 Th.26 Ca1.34 Dy.02 Sm.01 Pr.01 Na.68 Nd.04 Ce.02 Ba.02 K.52 Si8 O20'
_cell_length_a 7.5505
_cell_length_b 7.5505
_cell_length_c 14.7104
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 838.641
_exptl_crystal_density_diffrn      3.376
_symmetry_space_group_name_H-M 'P 4/m c c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-y,-x,1/2+z'
  'y,x,1/2-z'
  'y,-x,-z'
  '-y,x,z'
  'x,-y,1/2+z'
  '-x,y,1/2-z'
  'x,y,-z'
  '-x,-y,z'
  'y,x,1/2+z'
  '-y,-x,1/2-z'
  '-y,x,-z'
  'y,-x,z'
  '-x,y,1/2+z'
  '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
U4+A   0.00000   0.00000   0.25000   0.59000   0.00970
ThA   0.00000   0.00000   0.25000   0.26000   0.00970
CaA   0.00000   0.00000   0.25000   0.10000   0.00970
DyA   0.00000   0.00000   0.25000   0.02000   0.00970
SmA   0.00000   0.00000   0.25000   0.01000   0.00970
PrA   0.00000   0.00000   0.25000   0.01000   0.00970
CaB   0.00000   0.50000   0.25000   0.62000   0.01410
NaB   0.00000   0.50000   0.25000   0.34000   0.01410
NdB   0.00000   0.50000   0.25000   0.02000   0.01410
CeB   0.00000   0.50000   0.25000   0.01000   0.01410
BaB   0.00000   0.50000   0.25000   0.01000   0.01410
KC   0.00000   0.00000   0.00000   0.52000   0.03390
Si   0.25940   0.33540   0.10846   1.00000   0.01070
O1  -0.23620   0.68450   0.00000   1.00000   0.02290
O2   0.45380   0.25670   0.13610   1.00000   0.01720
O3  -0.10260   0.25080   0.33570   1.00000   0.01570
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
U4+A 0.00710 0.00710 0.01490 0.00000 0.00000 0.00000
ThA 0.00710 0.00710 0.01490 0.00000 0.00000 0.00000
CaA 0.00710 0.00710 0.01490 0.00000 0.00000 0.00000
DyA 0.00710 0.00710 0.01490 0.00000 0.00000 0.00000
SmA 0.00710 0.00710 0.01490 0.00000 0.00000 0.00000
PrA 0.00710 0.00710 0.01490 0.00000 0.00000 0.00000
CaB 0.01340 0.01240 0.01650 0.00000 0.00000 0.00000
NaB 0.01340 0.01240 0.01650 0.00000 0.00000 0.00000
NdB 0.01340 0.01240 0.01650 0.00000 0.00000 0.00000
CeB 0.01340 0.01240 0.01650 0.00000 0.00000 0.00000
BaB 0.01340 0.01240 0.01650 0.00000 0.00000 0.00000
KC 0.02880 0.02880 0.04420 0.00000 0.00000 0.00000
Si 0.00930 0.00970 0.01320 0.00010 0.00080 0.00010
O1 0.02630 0.02950 0.01290 0.00000 0.00000 0.00000
O2 0.01050 0.01910 0.02210 0.00050 0.00040 0.00360
O3 0.01300 0.01380 0.02020 -0.00010 0.00370 -0.00260