data_global
_chemical_name_mineral 'Stichtite'
loop_
_publ_author_name
'Mills S J'
'Whitfield P S'
'Wilson S A'
'Woodhouse J N'
'Dipple G M'
'Raudsepp M'
'Francis C A'
_journal_name_full 'American Mineralogist'
_journal_volume 96 
_journal_year 2011
_journal_page_first 179
_journal_page_last 187
_publ_section_title
;
 The crystal structure of stichtite, re-examination of barbertonite, and the
 nature of polytypism in MgCr hydrotalcites
 Note: 3R1 polytype of stichtite
;
_database_code_amcsd 0018330
_chemical_compound_source 'Tasmania, Australia'
_chemical_formula_sum '(Mg.77 Cr.23) O2.966 H3.224 C.118'
_cell_length_a 3.09552
_cell_length_b 3.09552
_cell_length_c 23.5042
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 195.049
_exptl_crystal_density_diffrn      2.115
_symmetry_space_group_name_H-M 'R -3 m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '2/3+x,1/3+y,1/3+z'
  '1/3+x,2/3+y,2/3+z'
  'x,x-y,z'
  '2/3+x,1/3+x-y,1/3+z'
  '1/3+x,2/3+x-y,2/3+z'
  'y,x,-z'
  '2/3+y,1/3+x,1/3-z'
  '1/3+y,2/3+x,2/3-z'
  '-x+y,y,z'
  '2/3-x+y,1/3+y,1/3+z'
  '1/3-x+y,2/3+y,2/3+z'
  '-x,-x+y,-z'
  '2/3-x,1/3-x+y,1/3-z'
  '1/3-x,2/3-x+y,2/3-z'
  '-y,-x,z'
  '2/3-y,1/3-x,1/3+z'
  '1/3-y,2/3-x,2/3+z'
  'x-y,-y,-z'
  '2/3+x-y,1/3-y,1/3-z'
  '1/3+x-y,2/3-y,2/3-z'
  'y,-x+y,-z'
  '2/3+y,1/3-x+y,1/3-z'
  '1/3+y,2/3-x+y,2/3-z'
  '-x+y,-x,z'
  '2/3-x+y,1/3-x,1/3+z'
  '1/3-x+y,2/3-x,2/3+z'
  '-x,-y,-z'
  '2/3-x,1/3-y,1/3-z'
  '1/3-x,2/3-y,2/3-z'
  '-y,x-y,z'
  '2/3-y,1/3+x-y,1/3+z'
  '1/3-y,2/3+x-y,2/3+z'
  'x-y,x,-z'
  '2/3+x-y,1/3+x,1/3-z'
  '1/3+x-y,2/3+x,2/3-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
Mg   0.00000   0.00000   0.00000   0.77000   0.00203
Cr   0.00000   0.00000   0.00000   0.23000   0.00203
O1   0.33333   0.66667   0.37268   1.00000   0.00051
H1   0.33333   0.66667   0.41108   1.00000   0.00051
Wat2   0.12420  -0.12420   0.50000   0.10200   0.00025
CO3   0.33333   0.66667   0.50000   0.05900   0.00025
O3   0.12420  -0.12420   0.50000   0.05900   0.00025