The structure described by MgNb2(BO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form distorted MgO6 octahedra that share  a cornercorner with one B(1)O4 tetrahedra,  a cornercorner with one B(2)O4 tetrahedra,  an edgeedge with one B(1)O4 tetrahedra, and  an edgeedge with one B(2)O4 tetrahedra. There are two inequivalent Nb sites. In the first Nb site, Nb(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. In the second Nb site, Nb(2) 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. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form BO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. In the second B site, B(2) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form BO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(2), and one B(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(2), and one B(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(2) atom. is represented by the CIF card [CIF]
data_MgNb2(BO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.579
_cell_length_b   5.447
_cell_length_c   5.584
_cell_angle_alpha   103.720
_cell_angle_beta   106.061
_cell_angle_gamma   120.202
_symmetry_Int_Tables_number   1
_cell_volume   125.622
_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  0.291  0.010  0.784  1.0
  Nb  Nb1  1  0.115  0.872  0.227  1.0
  Nb  Nb2  1  0.873  0.149  0.746  1.0
  B  B3  1  0.640  0.400  0.279  1.0
  B  B4  1  0.398  0.621  0.743  1.0
  O  O5  1  0.768  0.377  0.060  1.0
  O  O6  1  0.734  0.824  0.923  1.0
  O  O7  1  0.294  0.245  0.111  1.0
  O  O8  1  0.201  0.644  0.893  1.0
  O  O9  1  0.228  0.281  0.607  1.0
  O  O10  1  0.617  0.196  0.411  1.0
  O  O11  1  0.843  0.740  0.449  1.0
  O  O12  1  0.385  0.777  0.553  1.0
[/CIF]
.
The structure described by MgNb2(BO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form distorted MgO6 octahedra that share  a cornercorner with one B(1)O4 tetrahedra,  a cornercorner with one B(2)O4 tetrahedra,  an edgeedge with one B(1)O4 tetrahedra, and  an edgeedge with one B(2)O4 tetrahedra. There are two inequivalent Nb sites. In the first Nb site, Nb(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. In the second Nb site, Nb(2) 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. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form BO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. In the second B site, B(2) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form BO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(2), and one B(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(2), and one B(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one Nb(1), one Nb(2), and one B(2) atom. is represented by the CIF card [CIF]
data_MgNb2(BO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.579
_cell_length_b   5.447
_cell_length_c   5.584
_cell_angle_alpha   103.720
_cell_angle_beta   106.061
_cell_angle_gamma   120.202
_symmetry_Int_Tables_number   1
_cell_volume   125.622
_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  0.291  0.010  0.784  1.0
  Nb  Nb1  1  0.115  0.872  0.227  1.0
  Nb  Nb2  1  0.873  0.149  0.746  1.0
  B  B3  1  0.640  0.400  0.279  1.0
  B  B4  1  0.398  0.621  0.743  1.0
  O  O5  1  0.768  0.377  0.060  1.0
  O  O6  1  0.734  0.824  0.923  1.0
  O  O7  1  0.294  0.245  0.111  1.0
  O  O8  1  0.201  0.644  0.893  1.0
  O  O9  1  0.228  0.281  0.607  1.0
  O  O10  1  0.617  0.196  0.411  1.0
  O  O11  1  0.843  0.740  0.449  1.0
  O  O12  1  0.385  0.777  0.553  1.0
[/CIF]
.