data_global
_chemical_name_mineral 'Lovdarite'
loop_
_publ_author_name
'Merlino S'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 2 
_journal_year 1990
_journal_page_first 809
_journal_page_last 817
_publ_section_title
;
 Lovdarite, K4Na12(Be8Si28O72).18H2O, a zeolite-like mineral:
 structural features and OD character
;
_database_code_amcsd 0006403
_chemical_formula_sum 'K2 Na6 Si14 Be4 O45 H18'
_cell_length_a 39.576
_cell_length_b 6.9308
_cell_length_c 7.1526
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1961.910
_exptl_crystal_density_diffrn      2.342
_symmetry_space_group_name_H-M 'P m a 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,-y,z'
  '1/2-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   0.38600   0.04170   0.18280   0.02508
Na1   0.25000   0.60980   0.24370   0.02470
Na2   0.25000   0.62170   0.76830   0.02495
Na3   0.12830   0.85420   0.69900   0.02761
Na4   0.00690   0.28400   0.86520   0.07726
Si1   0.21130   0.05040   0.27700   0.00925
Si2   0.21130   0.04970   0.71790   0.01064
Si3   0.19520   0.36710  -0.00080   0.00975
Si4   0.12480   0.50260  -0.02690   0.01127
Si5   0.05820   0.52670   0.13990   0.01165
Si6   0.03330   0.25930   0.44690   0.01001
Si7   0.04580   0.82020   0.45880   0.01102
Be1   0.18050   0.78200   0.00500   0.00595
Be2   0.06700   0.54150   0.73340   0.01267
O1   0.25000  -0.03190   0.27230   0.00773
O2   0.21030   0.26030   0.18570   0.01710
O3   0.18580  -0.09600   0.19010   0.01418
O4   0.20230   0.09050   0.50070   0.01684
O5   0.25000  -0.03240   0.72870   0.01520
O6   0.21060   0.26240   0.81470   0.01444
O7   0.18580  -0.10140   0.80300   0.01456
O8   0.20650   0.58700   0.00110   0.00975
O9   0.15400   0.33560   0.00270   0.01684
O10   0.14090   0.71220  -0.00410   0.01583
O11   0.09790   0.45630   0.14630   0.01267
O12   0.10570   0.47350   0.77940   0.01697
O13   0.03550   0.36080   0.24930   0.01545
O14   0.05630   0.72050   0.26060   0.02394
O15   0.04480   0.55390  -0.06710   0.01773
O16   0.05140   0.05010   0.42260   0.01431
O17   0.04930   0.37820   0.61450   0.01912
O18  -0.00600   0.21980   0.50390   0.01811
O19   0.06780  -0.25010   0.63410   0.01115
Wat1   0.21150   0.56430   0.51230   0.02748
Wat2   0.14380   0.69580   0.42470   0.03014
Wat3   0.12900   0.18200   0.54590   0.03420
Wat4   0.07440   0.06160   0.87900   0.04952
Wat5   0.00000   0.00000   0.01340   0.10170