data_Ca4SiCl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.54
_cell_length_b   6.54
_cell_length_c   6.54
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ca4SiCl
_chemical_formula_sum   'Ca4 Si1 Cl1'
_cell_volume   197.95
_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
  Ca  Ca0  1  0.8  0.8  0.45  1.0
  Ca  Ca1  1  0.8  0.45  0.8  1.0
  Ca  Ca2  1  0.45  0.8  0.8  1.0
  Ca  Ca3  1  0.45  0.45  0.45  1.0
  Si  Si5  1  0.0  0.0  0.0  1.0
  Cl  Cl4  1  0.94  0.94  0.94  1.0

data_Ca4SiCl
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.54
_cell_length_b   6.54
_cell_length_c   16.02
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Ca4SiCl
_chemical_formula_sum   'Ca12 Si3 Cl3'
_cell_volume   593.86
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Ca  Ca0  9  0.22  0.44  0.98  1.0
  Ca  Ca1  3  0.0  0.0  0.55  1.0
  Si  Si2  3  0.0  0.0  0.0  1.0
  Cl  Cl3  3  0.0  0.0  0.06  1.0

Ca Ca Ca Ca Si Cl
Ca4SiCl crystallizes in the trigonal R3m space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 4-coordinate geometry to two equivalent Ca(1), three equivalent Ca(2), one Si(1), and one Cl(1) atom. Both Ca(1)-Ca(1) bond lengths are 2.24 Å. There are two shorter (3.72 Å) and one longer (3.89 Å) Ca(1)-Ca(2) bond length. The Ca(1)-Si(1) bond length is 2.50 Å. The Ca(1)-Cl(1) bond length is 2.78 Å. In the second Ca site, Ca(2) is bonded in a 9-coordinate geometry to nine equivalent Ca(1) atoms. Si(1) is bonded in a single-bond geometry to three equivalent Ca(1) and one Cl(1) atom. The Si(1)-Cl(1) bond length is 0.98 Å. Cl(1) is bonded in a single-bond geometry to three equivalent Ca(1) and one Si(1) atom.