data_global
_chemical_name_mineral 'Chamosite'
loop_
_publ_author_name
'Walker J R'
'Bish D L'
_journal_name_full 'Clays and Clay Minerals'
_journal_volume 40 
_journal_year 1992
_journal_page_first 319
_journal_page_last 322
_publ_section_title
;
 Application of Rietveld refinement techniques to a disordered IIb Mg-chamosite
;
_database_code_amcsd 0012235
_chemical_compound_source 'Lebanon, New Hampshire, USA'
_chemical_formula_sum '(Mg2.518 Fe2.482) Al1.2 Si3.8 O18 H10'
_cell_length_a 5.36982
_cell_length_b 9.3031
_cell_length_c 14.2610
_cell_angle_alpha 90.315
_cell_angle_beta 97.234
_cell_angle_gamma 90.022
_cell_volume 706.740
_exptl_crystal_density_diffrn      2.993
_symmetry_space_group_name_H-M 'C -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'
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   0.00000   0.00000   0.53800   0.00200
FeM1   0.00000   0.00000   0.00000   0.46200   0.00200
MgM2   0.01410   0.33480   0.00270   0.49600   0.00200
FeM2   0.01410   0.33480   0.00270   0.50400   0.00200
MgM3   0.00320   0.16830   0.50040   0.49400   0.00200
FeM3   0.00320   0.16830   0.50040   0.50600   0.00200
AlM4   0.00000   0.50000   0.50000   1.00000   0.00300
SiT1   0.24000   0.17000   0.19410   0.95000   0.00100
AlT1   0.24000   0.17000   0.19410   0.05000   0.00100
SiT2   0.73000   0.99800   0.19450   0.95000   0.00100
AlT2   0.73000   0.99800   0.19450   0.05000   0.00100
O1   0.19100   0.16350   0.07890   1.00000   0.01100
O2   0.70500   0.99800   0.07560   1.00000   0.01100
O3   0.23100   0.33600   0.23740   1.00000   0.01100
O4   0.52800   0.11800   0.23020   1.00000   0.01100
O-H5   0.01800   0.06100   0.23060   1.00000   0.01100
O-H6   0.68900   0.33120   0.07420   1.00000   0.01100
O-H7   0.14400   0.99900   0.43000   1.00000   0.01100
O-H8   0.14300   0.33610   0.42860   1.00000   0.01100
O-H9   0.64300   0.16270   0.43110   1.00000   0.01100