The material described by K2Ca2MgH2(SO4)4 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 11-coordinate geometry to one H(1), one O(3), one O(4), two equivalent O(2), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. Mg(1) is bonded to two equivalent H(1), two equivalent O(1), and two equivalent O(4) atoms to form MgH2O4 octahedra that share corners with two equivalent S(1)O4 tetrahedra and corners with two equivalent S(2)O4 tetrahedra. H(1) is bonded in a water-like geometry to one K(1) and one Mg(1) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form SO4 tetrahedra that share  a cornercorner with one Mg(1)H2O4 octahedra. The corner-sharing octahedral tilt angles are 51°. In the second S site, S(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form SO4 tetrahedra that share  a cornercorner with one Mg(1)H2O4 octahedra. The corner-sharing octahedral tilt angles are 31°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Ca(1), one Mg(1), and one S(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent K(1), one Ca(1), and one S(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), and one S(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Ca(1), one Mg(1), and one S(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Ca(1) and one S(2) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent K(1), one Ca(1), and one S(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1), one Ca(1), and one S(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(1), one Ca(1), and one S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Ca2MgH2(SO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.964
_cell_length_b   6.994
_cell_length_c   8.936
_cell_angle_alpha   100.054
_cell_angle_beta   104.624
_cell_angle_gamma   113.967
_symmetry_Int_Tables_number   1
_cell_volume   365.424
_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
  K  K0  1  0.713  0.481  0.434  1.0
  K  K1  1  0.287  0.519  0.566  1.0
  Ca  Ca2  1  0.875  0.136  0.752  1.0
  Ca  Ca3  1  0.125  0.864  0.248  1.0
  Mg  Mg4  1  0.500  0.000  0.000  1.0
  H  H5  1  0.462  0.667  0.919  1.0
  H  H6  1  0.538  0.333  0.081  1.0
  S  S7  1  0.687  0.947  0.358  1.0
  S  S8  1  0.313  0.053  0.642  1.0
  S  S9  1  0.935  0.687  0.859  1.0
  S  S10  1  0.065  0.313  0.141  1.0
  O  O11  1  0.172  0.871  0.958  1.0
  O  O12  1  0.828  0.129  0.042  1.0
  O  O13  1  0.811  0.771  0.751  1.0
  O  O14  1  0.189  0.229  0.249  1.0
  O  O15  1  0.781  0.829  0.270  1.0
  O  O16  1  0.219  0.171  0.730  1.0
  O  O17  1  0.512  0.972  0.231  1.0
  O  O18  1  0.488  0.028  0.769  1.0
  O  O19  1  0.831  0.623  0.979  1.0
  O  O20  1  0.169  0.377  0.021  1.0
  O  O21  1  0.946  0.504  0.756  1.0
  O  O22  1  0.054  0.496  0.244  1.0
  O  O23  1  0.576  0.821  0.456  1.0
  O  O24  1  0.424  0.179  0.544  1.0
  O  O25  1  0.138  0.830  0.532  1.0
  O  O26  1  0.862  0.170  0.468  1.0
[/CIF]
.
The material described by K2Ca2MgH2(SO4)4 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 11-coordinate geometry to one H(1), one O(3), one O(4), two equivalent O(2), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms. Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. Mg(1) is bonded to two equivalent H(1), two equivalent O(1), and two equivalent O(4) atoms to form MgH2O4 octahedra that share corners with two equivalent S(1)O4 tetrahedra and corners with two equivalent S(2)O4 tetrahedra. H(1) is bonded in a water-like geometry to one K(1) and one Mg(1) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form SO4 tetrahedra that share  a cornercorner with one Mg(1)H2O4 octahedra. The corner-sharing octahedral tilt angles are 51°. In the second S site, S(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form SO4 tetrahedra that share  a cornercorner with one Mg(1)H2O4 octahedra. The corner-sharing octahedral tilt angles are 31°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Ca(1), one Mg(1), and one S(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to two equivalent K(1), one Ca(1), and one S(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), and one S(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Ca(1), one Mg(1), and one S(1) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Ca(1) and one S(2) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent K(1), one Ca(1), and one S(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(1), one Ca(1), and one S(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(1), one Ca(1), and one S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Ca2MgH2(SO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.964
_cell_length_b   6.994
_cell_length_c   8.936
_cell_angle_alpha   100.054
_cell_angle_beta   104.624
_cell_angle_gamma   113.967
_symmetry_Int_Tables_number   1
_cell_volume   365.424
_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
  K  K0  1  0.713  0.481  0.434  1.0
  K  K1  1  0.287  0.519  0.566  1.0
  Ca  Ca2  1  0.875  0.136  0.752  1.0
  Ca  Ca3  1  0.125  0.864  0.248  1.0
  Mg  Mg4  1  0.500  0.000  0.000  1.0
  H  H5  1  0.462  0.667  0.919  1.0
  H  H6  1  0.538  0.333  0.081  1.0
  S  S7  1  0.687  0.947  0.358  1.0
  S  S8  1  0.313  0.053  0.642  1.0
  S  S9  1  0.935  0.687  0.859  1.0
  S  S10  1  0.065  0.313  0.141  1.0
  O  O11  1  0.172  0.871  0.958  1.0
  O  O12  1  0.828  0.129  0.042  1.0
  O  O13  1  0.811  0.771  0.751  1.0
  O  O14  1  0.189  0.229  0.249  1.0
  O  O15  1  0.781  0.829  0.270  1.0
  O  O16  1  0.219  0.171  0.730  1.0
  O  O17  1  0.512  0.972  0.231  1.0
  O  O18  1  0.488  0.028  0.769  1.0
  O  O19  1  0.831  0.623  0.979  1.0
  O  O20  1  0.169  0.377  0.021  1.0
  O  O21  1  0.946  0.504  0.756  1.0
  O  O22  1  0.054  0.496  0.244  1.0
  O  O23  1  0.576  0.821  0.456  1.0
  O  O24  1  0.424  0.179  0.544  1.0
  O  O25  1  0.138  0.830  0.532  1.0
  O  O26  1  0.862  0.170  0.468  1.0
[/CIF]
.