data_9009591
_chemical_name 'Ankerite'
loop_
_publ_author_name
'Beran A'
'Zemann J'
_journal_name_full "Tschermaks Mineralogische und Petrographische Mitteilungen"
_journal_volume 24
_journal_year 1977
_journal_page_first 279
_journal_page_last 286
_publ_section_title
;
 Refinement and comparison of the crystal structures of a dolomite and of an Fe-
 Locality: Erzberg, Etage Dreikonig, Styria, Austria
;
_chemical_formula_sum 'Ca1.05 Fe.63 Mg.27 Mn.05 C2 O6'
_cell_length_a 4.830
_cell_length_b 4.830
_cell_length_c 16.167
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 326.629
_symmetry_space_group_name_H-M 'R -3'
loop_
_symmetry_equiv_pos_as_xyz
  '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'
  '-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
Ca   0.00000   0.00000   0.00000   1.00000
Fe   0.00000   0.00000   0.50000   0.63000
Mg   0.00000   0.00000   0.50000   0.27000
Ca   0.00000   0.00000   0.50000   0.05000
Mn   0.00000   0.00000   0.50000   0.05000
C   0.00000   0.00000   0.24420   1.00000
O   0.25060  -0.02830   0.24490   1.00000