The structure described by MgNi(GeO3)2 is Esseneite structured and crystallizes in the monoclinic C2/c space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra and edges with three equivalent Ni(1)O6 octahedra. Ni(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form NiO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra, edges with two equivalent Ni(1)O6 octahedra, and edges with three equivalent Mg(1)O6 octahedra. Ge(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with three equivalent Ni(1)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mg(1), one Ni(1), and one Ge(1) atom. In the third O site, O(3) is bonded to one Mg(1), two equivalent Ni(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OMgNi2Ge trigonal pyramids. is represented by the CIF file [CIF]
data_MgNi(GeO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.225
_cell_length_b   6.629
_cell_length_c   6.629
_cell_angle_alpha   85.613
_cell_angle_beta   81.899
_cell_angle_gamma   81.897
_symmetry_Int_Tables_number   1
_cell_volume   224.631
_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
  Ge  Ge0  1  0.210  0.795  0.605  1.0
  Ge  Ge1  1  0.290  0.395  0.205  1.0
  Ge  Ge2  1  0.790  0.205  0.395  1.0
  Ge  Ge3  1  0.710  0.605  0.795  1.0
  Mg  Mg4  1  0.250  0.268  0.732  1.0
  Mg  Mg5  1  0.750  0.732  0.268  1.0
  Ni  Ni6  1  0.250  0.908  0.092  1.0
  Ni  Ni7  1  0.750  0.092  0.908  1.0
  O  O8  1  0.403  0.569  0.709  1.0
  O  O9  1  0.097  0.291  0.431  1.0
  O  O10  1  0.597  0.431  0.291  1.0
  O  O11  1  0.903  0.709  0.569  1.0
  O  O12  1  0.883  0.373  0.862  1.0
  O  O13  1  0.618  0.138  0.627  1.0
  O  O14  1  0.117  0.627  0.138  1.0
  O  O15  1  0.383  0.862  0.373  1.0
  O  O16  1  0.131  0.976  0.794  1.0
  O  O17  1  0.369  0.206  0.024  1.0
  O  O18  1  0.869  0.024  0.206  1.0
  O  O19  1  0.631  0.794  0.976  1.0
[/CIF]
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The structure described by MgNi(GeO3)2 is Esseneite structured and crystallizes in the monoclinic C2/c space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra and edges with three equivalent Ni(1)O6 octahedra. Ni(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form NiO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra, edges with two equivalent Ni(1)O6 octahedra, and edges with three equivalent Mg(1)O6 octahedra. Ge(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with three equivalent Ni(1)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mg(1), one Ni(1), and one Ge(1) atom. In the third O site, O(3) is bonded to one Mg(1), two equivalent Ni(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OMgNi2Ge trigonal pyramids. is represented by the CIF file [CIF]
data_MgNi(GeO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.225
_cell_length_b   6.629
_cell_length_c   6.629
_cell_angle_alpha   85.613
_cell_angle_beta   81.899
_cell_angle_gamma   81.897
_symmetry_Int_Tables_number   1
_cell_volume   224.631
_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
  Ge  Ge0  1  0.210  0.795  0.605  1.0
  Ge  Ge1  1  0.290  0.395  0.205  1.0
  Ge  Ge2  1  0.790  0.205  0.395  1.0
  Ge  Ge3  1  0.710  0.605  0.795  1.0
  Mg  Mg4  1  0.250  0.268  0.732  1.0
  Mg  Mg5  1  0.750  0.732  0.268  1.0
  Ni  Ni6  1  0.250  0.908  0.092  1.0
  Ni  Ni7  1  0.750  0.092  0.908  1.0
  O  O8  1  0.403  0.569  0.709  1.0
  O  O9  1  0.097  0.291  0.431  1.0
  O  O10  1  0.597  0.431  0.291  1.0
  O  O11  1  0.903  0.709  0.569  1.0
  O  O12  1  0.883  0.373  0.862  1.0
  O  O13  1  0.618  0.138  0.627  1.0
  O  O14  1  0.117  0.627  0.138  1.0
  O  O15  1  0.383  0.862  0.373  1.0
  O  O16  1  0.131  0.976  0.794  1.0
  O  O17  1  0.369  0.206  0.024  1.0
  O  O18  1  0.869  0.024  0.206  1.0
  O  O19  1  0.631  0.794  0.976  1.0
[/CIF]
.