data_global
_chemical_name_mineral 'Pertsevite-(OH)'
loop_
_publ_author_name
'Galuskina I O'
'Kadiyski M'
'Armbruster T'
'Galuskin E V'
'Pertsev N N'
'Dzierzanowski P'
'Wrzalik R'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 20 
_journal_year 2008
_journal_page_first 951
_journal_page_last 964
_publ_section_title
;
 A new natural phase in the system Mg2SiO4-Mg2BO3F-Mg2BO3(OH): composition,
 paragenesis and structure of OH-dominant pertsevite
;
_database_code_amcsd 0007266
_chemical_compound_source 'East Vekhoyan'ye region, northern Siberia'
_chemical_formula_sum 'Mg8 B3.112 Si1.028 O16.026'
_cell_length_a 20.494
_cell_length_b 11.890
_cell_length_c 4.5880
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1117.975
_exptl_crystal_density_diffrn      3.050
_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
Mg1   0.37724   0.25000   0.01930   1.00000   0.01300
Mg2   0.37760  -0.02284   0.01730   1.00000   0.01280
Mg3   0.24737   0.11148   0.03260   1.00000   0.01290
Mg4  -0.01370   0.12252  -0.00790   1.00000   0.01450
Mg5   0.11879   0.25000   0.01330   1.00000   0.01540
B1   0.34460   0.08560  -0.43620   0.85600   0.01020
B2   0.02430   0.22020   0.45600   0.27100   0.01020
B2A   0.47660  -0.03400  -0.07600   0.14400   0.01020
B3   0.18510   0.25000  -0.43300   0.57000   0.01020
Si1   0.33250   0.12430  -0.39680   0.11300   0.01020
Si2   0.03500   0.25000   0.42910   0.39800   0.01020
Si3   0.21040   0.25000  -0.39170   0.40400   0.01020
O1   0.20521   0.25000   0.26860   1.00000   0.01670
O2   0.33513   0.11208   0.26870   1.00000   0.01510
O3   0.03173   0.25000  -0.23840   1.00000   0.01470
O4   0.32872  -0.14794   0.23010   1.00000   0.01580
O5   0.40017   0.11717  -0.28060   1.00000   0.01460
O6   0.46568   0.25000   0.20540   1.00000   0.01500
O7   0.46278  -0.00783   0.24860   1.00000   0.01080
O8   0.42160  -0.12570  -0.27100   0.27100   0.00990
O8A   0.43020  -0.10900  -0.23300   0.14000   0.00990
O8B   0.43120  -0.14860  -0.20660   0.60200   0.00990
O9   0.30137   0.01635  -0.28160   1.00000   0.01390
O10   0.28769   0.25000  -0.19840   1.00000   0.02540
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
Mg1 0.01130 0.01100 0.01680 0.00000 0.00120 0.00000
Mg2 0.01670 0.01070 0.01100 -0.00120 -0.00190 0.00100
Mg3 0.01000 0.01260 0.01600 -0.00130 -0.00050 -0.00080
Mg4 0.01220 0.01400 0.01730 -0.00050 -0.00020 -0.00210
Mg5 0.01360 0.01550 0.01710 0.00000 -0.00170 0.00000
O1 0.02000 0.01450 0.01550 0.00000 -0.00260 0.00000
O2 0.01460 0.01850 0.01210 -0.00200 0.00030 0.00020
O3 0.01350 0.01440 0.01640 0.00000 0.00170 0.00000
O4 0.01570 0.01720 0.01440 0.00070 0.00000 0.00250
O5 0.01390 0.01650 0.01350 -0.00020 0.00140 0.00000
O6 0.01480 0.01430 0.01590 0.00000 -0.00370 0.00000
O7 0.00950 0.00870 0.01410 0.00190 -0.00400 -0.00060
O9 0.01490 0.01380 0.01300 -0.00210 -0.00150 -0.00100
O10 0.03000 0.02020 0.02600 0.00000 0.00480 0.00000