data_global
_chemical_name_mineral 'Glaucophane'
loop_
_publ_author_name
'Comodi P'
'Mellini M'
'Ungaretti L'
'Zanazzi P F'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 3 
_journal_year 1991
_journal_page_first 485
_journal_page_last 499
_publ_section_title
;
 Compressibility and high pressure structure refinement
 of tremolite, pargasite and glaucophane
 Sample: pressure at 20 kbar
;
_database_code_amcsd 0006416
_chemical_formula_sum 'Mg1.98 Fe1.42 Al1.6 (Na1.98 Li.02) Si8 O24 H2'
_cell_length_a 9.422
_cell_length_b 17.662
_cell_length_c 5.274
_cell_angle_alpha 90
_cell_angle_beta 103.9
_cell_angle_gamma 90
_cell_volume 851.953
_exptl_crystal_density_diffrn      3.224
_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
MgM1   0.00000   0.09110   0.50000   0.72000   0.02220
FeM1   0.00000   0.09110   0.50000   0.28000   0.02220
AlM2   0.00000   0.18010   0.00000   0.80000   0.00020
FeM2   0.00000   0.18010   0.00000   0.20000   0.00020
MgM3   0.00000   0.00000   0.00000   0.54000   0.00020
FeM3   0.00000   0.00000   0.00000   0.46000   0.00020
NaM4   0.00000   0.27750   0.50000   0.99000   0.01800
LiM4   0.00000   0.27750   0.50000   0.01000   0.01800
SiT1   0.28500   0.08610   0.29350   1.00000   0.00400
SiT2   0.29440   0.17300   0.80760   1.00000   0.00110
O1   0.11050   0.09320   0.20060   1.00000   0.00230
O2   0.11670   0.17240   0.74750   1.00000   0.00010
O-H3   0.10920   0.00000   0.70350   1.00000   0.00570
O4   0.36730   0.25430   0.79820   1.00000   0.00410
O5   0.36010   0.13240   0.09590   1.00000   0.00080
O6   0.34640   0.12260   0.58510   1.00000   0.00640
O7   0.33820   0.00000   0.29470   1.00000   0.00870