data_global
_chemical_name_mineral 'Pargasite'
loop_
_publ_author_name
'Makino K'
'Tomita K'
_journal_name_full 'American Mineralogist'
_journal_volume 74 
_journal_year 1989
_journal_page_first 1097
_journal_page_last 1105
_publ_section_title
;
 Cation distribution in the octahedral sites of hornblendes
 sample I-P from Iratsu, Japan
;
_database_code_amcsd 0001267
_chemical_formula_sum '(Si6.2 Al1.8) Mg3.343 Fe1.771 Ca1.702 Na3.384 O24 H2'
_cell_length_a 9.805
_cell_length_b 17.96
_cell_length_c 5.302
_cell_angle_alpha 90
_cell_angle_beta 104.93
_cell_angle_gamma 90
_cell_volume 902.151
_exptl_crystal_density_diffrn      3.442
_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
Si1   0.28090   0.08580   0.30140   0.57000   0.00608
Al1   0.28090   0.08580   0.30140   0.43000   0.00608
Si2   0.29190   0.17310   0.81330   0.98000   0.00608
Al2   0.29190   0.17310   0.81330   0.02000   0.00608
Mg1   0.00000   0.08860   0.50000   0.61500   0.00988
Fe1   0.00000   0.08860   0.50000   0.38500   0.00988
Mg2   0.00000   0.17720   0.00000   0.81600   0.00621
Fe2   0.00000   0.17720   0.00000   0.18400   0.00621
Mg3   0.00000   0.00000   0.00000   0.48100   0.00785
Fe3   0.00000   0.00000   0.00000   0.51900   0.00785
Ca4   0.00000   0.27890   0.50000   0.85100   0.01013
Na4   0.00000   0.27890   0.50000   0.09200   0.01013
Fe4   0.00000   0.27890   0.50000   0.05700   0.01013
NaAm   0.04740   0.50000   0.10140   0.80000   0.03420
NaA2   0.00000   0.47740   0.00000   0.80000   0.02736
O1   0.10700   0.08960   0.21450   1.00000   0.01203
O2   0.12040   0.17420   0.73660   1.00000   0.00975
O-H3   0.11010   0.00000   0.71400   1.00000   0.01089
O4   0.36840   0.25010   0.78950   1.00000   0.01165
O5   0.35000   0.14040   0.10840   1.00000   0.01115
O6   0.34270   0.11810   0.60720   1.00000   0.01279
O7   0.33800   0.00000   0.27650   1.00000   0.01558