data_global
_chemical_name_mineral 'Chondrodite'
loop_
_publ_author_name
'Ottolini L'
'Camara F'
'Bigi S'
_journal_name_full 'American Mineralogist'
_journal_volume 85 
_journal_year 2000
_journal_page_first 89
_journal_page_last 102
_publ_section_title
;
 An investigation of matrix effects in the analysis of fluorine in humite-group
 minerals by EMPA, SIMS, and SREF
 Sample: Chum HV-41 n.2
;
_database_code_amcsd 0002337
_chemical_formula_sum 'Si4 Mg9 O16.72 F1.28 H.66'
_cell_length_a 4.7405
_cell_length_b 10.2377
_cell_length_c 13.6496
_cell_angle_alpha 100.843
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 650.613
_exptl_crystal_density_diffrn      3.183
_symmetry_space_group_name_H-M 'P 21/b 1 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-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
Si1   0.07329   0.06623   0.38930   1.00000   0.00393
Si2   0.07641   0.17670   0.83511   1.00000   0.00393
Mg1A   0.50000   0.00000   0.50000   1.00000   0.00583
Mg1B   0.49743   0.94627   0.27421   1.00000   0.00608
Mg25   0.00928   0.14038   0.17026   1.00000   0.00621
Mg26   0.50876   0.25023   0.38825   1.00000   0.00570
Mg3   0.49277   0.87792   0.04299   1.00000   0.00659
O11   0.73294   0.06451   0.38811   1.00000   0.00519
O12   0.27787   0.41947   0.38776   1.00000   0.00507
O13   0.22308   0.11240   0.29312   1.00000   0.00545
O14   0.22238   0.15881   0.48636   1.00000   0.00545
O21   0.23624   0.32276   0.16287   1.00000   0.00507
O22   0.77897   0.96885   0.16257   1.00000   0.00557
O23   0.72430   0.27994   0.26273   1.00000   0.00570
O24   0.72808   0.22680   0.07021   1.00000   0.00570
F5   0.26152   0.04630   0.05566   0.64000   0.00861
O5   0.26152   0.04630   0.05566   0.36000   0.00861
H   0.06700  -0.02100   0.01300   0.33000   0.05712