data_global
_chemical_name_mineral 'Lemmleinite-K'
loop_
_publ_author_name
'Rastsvetaeva R K'
'Arakcheeva A V'
'Khomyakov A P'
_journal_name_full 'Doklady Chemistry'
_journal_volume 351 
_journal_year 1996
_journal_page_first 294
_journal_page_last 297
_publ_section_title
;
 Crystal structure and microtwinning of a new monoclinic analog of
 nenadkevichite
;
_database_code_amcsd 0012501
_chemical_compound_source 'Khibiny alkaline massif, Kola Peninsula, Russia'
_chemical_formula_sum 'Na.43 K.875 (Ti.7 Nb.3) Si2 O7.89 H2.08'
_cell_length_a 14.39
_cell_length_b 13.900
_cell_length_c 7.825
_cell_angle_alpha 90
_cell_angle_beta 117.6
_cell_angle_gamma 90
_cell_volume 1387.054
_exptl_crystal_density_diffrn      2.777
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-z'
  '-x,-y,-z'
  '1/2-x,1/2-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
Na   0.40830   0.26470   0.00000   0.43000   0.04179
K1   0.08420   0.00000   0.33650   0.95000   0.03293
K2   0.41590   0.00000   0.70120   0.80000   0.04179
TiM1   0.00000   0.22440   0.50000   0.70000   0.01862
NbM1   0.00000   0.22440   0.50000   0.30000   0.01862
TiM2   0.25000   0.25000   0.50000   0.70000   0.01912
NbM2   0.25000   0.25000   0.50000   0.30000   0.01912
Si1   0.20860   0.10960   0.80150   1.00000   0.01026
Si2   0.32320   0.11010   0.25250   1.00000   0.01077
O1   0.23910   0.12440   0.02700   1.00000   0.01773
O2   0.27280   0.17980   0.73400   1.00000   0.01393
O3   0.10080   0.22440   0.39600   0.70000   0.01140
O-H3   0.10080   0.22440   0.39600   0.30000   0.01140
O4   0.23580   0.00000   0.76800   1.00000   0.01900
O5   0.42290   0.17670   0.30400   1.00000   0.02153
O6   0.26670   0.12840   0.38600   1.00000   0.01520
O7   0.36830   0.00000   0.28200   1.00000   0.01646
O8   0.08300   0.12370   0.68100   1.00000   0.01900
Wat1   0.50000   0.14200   0.00000   0.90000   0.11145
Wat2   0.00000   0.12600   0.00000   0.88000   0.13805