data_9004135
_chemical_name 'Ferroglaucophane'
loop_
_publ_author_name
'Hawthorne F C'
_journal_name_full "The Canadian Mineralogist"
_journal_volume 17
_journal_year 1979
_journal_page_first 1
_journal_page_last 10
_publ_section_title
;
 The crystal chemistry of the amphiboles. X. Refinement of the crystal
 structure of ferroglaucophane and an ideal polyhedral model for
 clinoamphiboles
;
_chemical_formula_sum 'O24 Si7.92 Al1.902 Fe2.277 Mg1.031 Na1.72 Ca.15'
_cell_length_a 9.587
_cell_length_b 17.832
_cell_length_c 5.315
_cell_angle_alpha 90
_cell_angle_beta 103.47
_cell_angle_gamma 90
_cell_volume 883.633
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_symmetry_equiv_pos_as_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
O1   0.10890   0.09470   0.20160   1.00000
O2   0.11780   0.17300   0.74780   1.00000
O3   0.11290   0.00000   0.70770   1.00000
O4   0.36950   0.25200   0.80640   1.00000
O5   0.35500   0.13070   0.08840   1.00000
O6   0.33980   0.12240   0.57930   1.00000
O7   0.32880   0.00000   0.30220   1.00000
SiT1   0.28240   0.08732   0.29220   0.99000
AlT1   0.28240   0.08732   0.29220   0.01000
SiT2   0.29260   0.17268   0.80790   0.99000
AlT2   0.29260   0.17268   0.80790   0.01000
FeM1   0.00000   0.09176   0.50000   0.58500
MgM1   0.00000   0.09176   0.50000   0.34800
AlM1   0.00000   0.09176   0.50000   0.06700
FeM2   0.00000   0.18168   0.00000   0.15600
AlM2   0.00000   0.18168   0.00000   0.84400
FeM3   0.00000   0.00000   0.00000   0.79500
MgM3   0.00000   0.00000   0.00000   0.20500
NaM4   0.00000   0.27720   0.50000   0.86000
CaM4   0.00000   0.27720   0.50000   0.07500
MgM4   0.00000   0.27720   0.50000   0.06500