The crystal structure described by MgMn2(BO3)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(4), one O(5), and one O(6) atom to form MgO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and  an edgeedge with one Mn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-75°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MnO6 octahedra that share corners with four equivalent Mg(1)O4 tetrahedra and corners with four equivalent Mn(2)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form distorted MnO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and  an edgeedge with one Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 60-80°. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(4), and one O(5) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted tetrahedral geometry to one Mg(1), one Mn(1), one Mn(2), and one B(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one B(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(1), and one B(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1), one Mn(1), and one B(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(1), one Mn(2), and one B(2) atom. is represented by the CIF file [CIF]
data_MgMn2(BO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.493
_cell_length_b   5.889
_cell_length_c   6.491
_cell_angle_alpha   47.559
_cell_angle_beta   41.811
_cell_angle_gamma   42.492
_symmetry_Int_Tables_number   1
_cell_volume   123.888
_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  0.723  0.425  0.558  1.0
  Mn  Mn1  1  0.013  0.007  0.009  1.0
  Mn  Mn2  1  0.303  0.592  0.463  1.0
  B  B3  1  0.362  0.176  0.256  1.0
  B  B4  1  0.663  0.851  0.772  1.0
  O  O5  1  0.351  0.872  0.521  1.0
  O  O6  1  0.917  0.549  0.798  1.0
  O  O7  1  0.379  0.876  0.997  1.0
  O  O8  1  0.638  0.174  0.010  1.0
  O  O9  1  0.092  0.467  0.258  1.0
  O  O10  1  0.700  0.143  0.502  1.0
[/CIF]
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The crystal structure described by MgMn2(BO3)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(4), one O(5), and one O(6) atom to form MgO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and  an edgeedge with one Mn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-75°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MnO6 octahedra that share corners with four equivalent Mg(1)O4 tetrahedra and corners with four equivalent Mn(2)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form distorted MnO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and  an edgeedge with one Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 60-80°. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(4), and one O(5) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted tetrahedral geometry to one Mg(1), one Mn(1), one Mn(2), and one B(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one B(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(1), and one B(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1), one Mn(1), and one B(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(1), one Mn(2), and one B(2) atom. is represented by the CIF file [CIF]
data_MgMn2(BO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.493
_cell_length_b   5.889
_cell_length_c   6.491
_cell_angle_alpha   47.559
_cell_angle_beta   41.811
_cell_angle_gamma   42.492
_symmetry_Int_Tables_number   1
_cell_volume   123.888
_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  0.723  0.425  0.558  1.0
  Mn  Mn1  1  0.013  0.007  0.009  1.0
  Mn  Mn2  1  0.303  0.592  0.463  1.0
  B  B3  1  0.362  0.176  0.256  1.0
  B  B4  1  0.663  0.851  0.772  1.0
  O  O5  1  0.351  0.872  0.521  1.0
  O  O6  1  0.917  0.549  0.798  1.0
  O  O7  1  0.379  0.876  0.997  1.0
  O  O8  1  0.638  0.174  0.010  1.0
  O  O9  1  0.092  0.467  0.258  1.0
  O  O10  1  0.700  0.143  0.502  1.0
[/CIF]
.