data_MgTi2Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.03
_cell_length_b   5.03
_cell_length_c   5.03
_cell_angle_alpha   135.33
_cell_angle_beta   135.33
_cell_angle_gamma   65.02
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgTi2Ni
_chemical_formula_sum   'Mg1 Ti2 Ni1'
_cell_volume   61.9
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Mg  Mg0  1  0.0  0.0  0.0  1.0
  Ti  Ti2  1  0.0  0.91  0.12  1.0
  Ti  Ti3  1  0.91  0.0  0.12  1.0
  Ni  Ni1  1  0.0  0.0  0.24  1.0

data_MgTi2Ni
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.4
_cell_length_b   5.4
_cell_length_c   5.03
_cell_angle_alpha   90.0
_cell_angle_beta   122.51
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   MgTi2Ni
_chemical_formula_sum   'Mg2 Ti4 Ni2'
_cell_volume   123.8
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Mg  Mg0  2  0.0  0.0  0.0  1.0
  Ti  Ti1  4  0.34  0.46  0.79  1.0
  Ni  Ni2  2  0.26  0.5  0.76  1.0

Mg Ti Ti Ni
Mg Ti Ti Ni 0 2 - o o 0 1 o - o 1 3 o + o 1 2 - + o 2 3 + o o 