The structure described by CaMg2(SO4)3 crystallizes in the hexagonal P6_3/m space group. Ca(1) is bonded in a distorted hexagonal planar geometry to six equivalent O(2) atoms. Mg(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra and  a faceface with one Mg(1)O6 octahedra. S(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SO4 tetrahedra that share corners with four equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-49°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Mg(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one S(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one S(1) atom. is represented by the CIF file [CIF]
data_CaMg2(SO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.470
_cell_length_b   8.470
_cell_length_c   7.447
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   462.644
_cell_formula_units_Z   2
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  0.000  0.000  0.000  1.0
  Ca  Ca1  1  0.000  0.000  0.500  1.0
  Mg  Mg2  1  0.667  0.333  0.953  1.0
  Mg  Mg3  1  0.333  0.667  0.047  1.0
  Mg  Mg4  1  0.333  0.667  0.453  1.0
  Mg  Mg5  1  0.667  0.333  0.547  1.0
  S  S6  1  0.033  0.670  0.750  1.0
  S  S7  1  0.670  0.637  0.250  1.0
  S  S8  1  0.637  0.967  0.750  1.0
  S  S9  1  0.363  0.033  0.250  1.0
  S  S10  1  0.967  0.330  0.250  1.0
  S  S11  1  0.330  0.363  0.750  1.0
  O  O12  1  0.872  0.480  0.750  1.0
  O  O13  1  0.163  0.963  0.250  1.0
  O  O14  1  0.442  0.142  0.086  1.0
  O  O15  1  0.199  0.163  0.750  1.0
  O  O16  1  0.608  0.128  0.750  1.0
  O  O17  1  0.520  0.392  0.750  1.0
  O  O18  1  0.858  0.299  0.086  1.0
  O  O19  1  0.142  0.701  0.586  1.0
  O  O20  1  0.299  0.442  0.586  1.0
  O  O21  1  0.128  0.520  0.250  1.0
  O  O22  1  0.037  0.199  0.250  1.0
  O  O23  1  0.963  0.801  0.750  1.0
  O  O24  1  0.801  0.837  0.250  1.0
  O  O25  1  0.299  0.442  0.914  1.0
  O  O26  1  0.142  0.701  0.914  1.0
  O  O27  1  0.480  0.608  0.250  1.0
  O  O28  1  0.701  0.558  0.086  1.0
  O  O29  1  0.442  0.142  0.414  1.0
  O  O30  1  0.392  0.872  0.250  1.0
  O  O31  1  0.858  0.299  0.414  1.0
  O  O32  1  0.701  0.558  0.414  1.0
  O  O33  1  0.837  0.037  0.750  1.0
  O  O34  1  0.558  0.858  0.586  1.0
  O  O35  1  0.558  0.858  0.914  1.0
[/CIF]
.
The structure described by CaMg2(SO4)3 crystallizes in the hexagonal P6_3/m space group. Ca(1) is bonded in a distorted hexagonal planar geometry to six equivalent O(2) atoms. Mg(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent S(1)O4 tetrahedra and  a faceface with one Mg(1)O6 octahedra. S(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SO4 tetrahedra that share corners with four equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-49°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Mg(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Ca(1) and one S(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one S(1) atom. is represented by the CIF file [CIF]
data_CaMg2(SO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.470
_cell_length_b   8.470
_cell_length_c   7.447
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   462.644
_cell_formula_units_Z   2
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  0.000  0.000  0.000  1.0
  Ca  Ca1  1  0.000  0.000  0.500  1.0
  Mg  Mg2  1  0.667  0.333  0.953  1.0
  Mg  Mg3  1  0.333  0.667  0.047  1.0
  Mg  Mg4  1  0.333  0.667  0.453  1.0
  Mg  Mg5  1  0.667  0.333  0.547  1.0
  S  S6  1  0.033  0.670  0.750  1.0
  S  S7  1  0.670  0.637  0.250  1.0
  S  S8  1  0.637  0.967  0.750  1.0
  S  S9  1  0.363  0.033  0.250  1.0
  S  S10  1  0.967  0.330  0.250  1.0
  S  S11  1  0.330  0.363  0.750  1.0
  O  O12  1  0.872  0.480  0.750  1.0
  O  O13  1  0.163  0.963  0.250  1.0
  O  O14  1  0.442  0.142  0.086  1.0
  O  O15  1  0.199  0.163  0.750  1.0
  O  O16  1  0.608  0.128  0.750  1.0
  O  O17  1  0.520  0.392  0.750  1.0
  O  O18  1  0.858  0.299  0.086  1.0
  O  O19  1  0.142  0.701  0.586  1.0
  O  O20  1  0.299  0.442  0.586  1.0
  O  O21  1  0.128  0.520  0.250  1.0
  O  O22  1  0.037  0.199  0.250  1.0
  O  O23  1  0.963  0.801  0.750  1.0
  O  O24  1  0.801  0.837  0.250  1.0
  O  O25  1  0.299  0.442  0.914  1.0
  O  O26  1  0.142  0.701  0.914  1.0
  O  O27  1  0.480  0.608  0.250  1.0
  O  O28  1  0.701  0.558  0.086  1.0
  O  O29  1  0.442  0.142  0.414  1.0
  O  O30  1  0.392  0.872  0.250  1.0
  O  O31  1  0.858  0.299  0.414  1.0
  O  O32  1  0.701  0.558  0.414  1.0
  O  O33  1  0.837  0.037  0.750  1.0
  O  O34  1  0.558  0.858  0.586  1.0
  O  O35  1  0.558  0.858  0.914  1.0
[/CIF]
.