data_global
_chemical_name_mineral 'Pargasite'
loop_
_publ_author_name
'Sharma A'
'Jenkins D M'
_journal_name_full 'American Mineralogist'
_journal_volume 84 
_journal_year 1999
_journal_page_first 1304
_journal_page_last 1318
_publ_section_title
;
 Hydrothermal synthesis of amphiboles along the tremolite-pargasite join
 and in the ternary system tremolite-pargasite-cummingtonite
 Sample: PARG 20-2
;
_database_code_amcsd 0002277
_chemical_formula_sum 'O24 Si6.88 Al1.72 Mg4.56 Ca1.84 Na.58'
_cell_length_a 9.8466
_cell_length_b 17.990
_cell_length_c 5.2793
_cell_angle_alpha 90
_cell_angle_beta 105.099
_cell_angle_gamma 90
_cell_volume 902.892
_exptl_crystal_density_diffrn      3.022
_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
O1   0.11310   0.08660   0.21560   1.00000   0.01013
O2   0.11040   0.17050   0.72240   1.00000   0.01013
O3   0.10800   0.00000   0.71860   1.00000   0.01013
O4   0.35610   0.24780   0.78200   1.00000   0.01013
O5   0.35160   0.13650   0.11320   1.00000   0.01393
O6   0.33680   0.11320   0.60430   1.00000   0.01393
O7   0.34350   0.00000   0.28050   1.00000   0.01520
Si1   0.28150   0.08580   0.30130   0.86000   0.00507
Al1   0.28150   0.08580   0.30130   0.14000   0.00507
Si2   0.28800   0.17140   0.80610   0.86000   0.00507
Al2   0.28800   0.17140   0.80610   0.14000   0.00507
Mg1   0.00000   0.08700   0.50000   0.88000   0.00760
Al1   0.00000   0.08700   0.50000   0.12000   0.00760
Mg2   0.00000   0.17630   0.50000   0.88000   0.00760
Al2   0.00000   0.17630   0.50000   0.12000   0.00760
Mg3   0.00000   0.00000   0.00000   0.88000   0.00760
Al3   0.00000   0.00000   0.00000   0.12000   0.00760
Ca4   0.00000   0.27760   0.50000   0.92000   0.01140
Mg4   0.00000   0.27760   0.50000   0.08000   0.01140
NaA   0.00000   0.50000   0.00000   0.58000   0.02913