data_global
_chemical_name_mineral 'Kostylevite'
loop_
_publ_author_name
'Ilyukhin V V'
'Khomyakov A P'
'Shumyatskaya N G'
'Voronkov A A'
'Nevskii N N'
'Belov N V'
_journal_name_full 'Soviet Physics Doklady'
_journal_volume 26 
_journal_year 1981
_journal_page_first 118
_journal_page_last 120
_publ_section_title
;
 The crystal structure of the new natural zirconosilicate K4Zr2Si6O18*2H2O
 Note: dimorphic with umbite
 Note: y(O7) corrected
;
_database_code_amcsd 0015609
_chemical_compound_source 'Khibinsk massif, Kola Peninsula, Russia'
_chemical_formula_sum 'K2 Zr Si3 O10 H2'
_cell_length_a 6.565
_cell_length_b 13.171
_cell_length_c 11.727
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 105.26
_cell_volume 978.253
_exptl_crystal_density_diffrn      2.822
_symmetry_space_group_name_H-M 'P 1 1 21/b'
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_U_iso_or_equiv
K1   0.79500   0.08530   0.54840   0.02254
K2   0.68160   0.88490   0.88310   0.03838
Zr   0.12230   0.22050   0.78340   0.00912
Si1   0.84380   0.15570   0.02750   0.00861
Si2   0.58850   0.15130   0.81320   0.00811
Si3   0.79090   0.01810   0.23570   0.00773
O1   0.80370   0.20030   0.74700   0.01343
O2   0.05730   0.19200   0.95360   0.01570
O3   0.43910   0.22980   0.81450   0.01520
O4   0.16490   0.37750   0.81290   0.01418
O5   0.19430   0.25570   0.61150   0.01520
O6   0.07700   0.06360   0.73260   0.01532
O7   0.63720   0.11880   0.94360   0.01786
O8   0.84950   0.05250   0.10240   0.01748
O9   0.46620   0.03760   0.75680   0.01279
Wat   0.40290   0.12430   0.49270   0.03584