The material described by MgMn2(PO4)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted MgO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with four equivalent Mn(1)O5 trigonal bipyramids, edges with two equivalent P(1)O4 tetrahedra, and edges with two equivalent Mn(1)O5 trigonal bipyramids. Mn(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(4) atoms to form distorted MnO5 trigonal bipyramids that share corners with two equivalent Mg(1)O6 octahedra, corners with five equivalent P(1)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 43-82°. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra, corners with five equivalent Mn(1)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 46°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(1), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the fourth O site, O(4) is bonded to one Mg(1), two equivalent Mn(1), and one P(1) atom to form a mixture of distorted edge and corner-sharing OMgMn2P trigonal pyramids. is represented by the CIF card [CIF]
data_MgMn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.428
_cell_length_b   4.880
_cell_length_c   6.426
_cell_angle_alpha   94.463
_cell_angle_beta   86.871
_cell_angle_gamma   73.750
_symmetry_Int_Tables_number   1
_cell_volume   162.371
_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  0.500  0.500  0.500  1.0
  Mn  Mn1  1  0.929  0.780  0.730  1.0
  Mn  Mn2  1  0.071  0.220  0.270  1.0
  P  P3  1  0.337  0.152  0.766  1.0
  P  P4  1  0.663  0.848  0.234  1.0
  O  O5  1  0.692  0.154  0.286  1.0
  O  O6  1  0.618  0.165  0.718  1.0
  O  O7  1  0.225  0.273  0.985  1.0
  O  O8  1  0.185  0.352  0.599  1.0
  O  O9  1  0.775  0.727  0.015  1.0
  O  O10  1  0.308  0.846  0.714  1.0
  O  O11  1  0.815  0.648  0.401  1.0
  O  O12  1  0.382  0.835  0.282  1.0
[/CIF]
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The material described by MgMn2(PO4)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted MgO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with four equivalent Mn(1)O5 trigonal bipyramids, edges with two equivalent P(1)O4 tetrahedra, and edges with two equivalent Mn(1)O5 trigonal bipyramids. Mn(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(4) atoms to form distorted MnO5 trigonal bipyramids that share corners with two equivalent Mg(1)O6 octahedra, corners with five equivalent P(1)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 43-82°. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra, corners with five equivalent Mn(1)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 46°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(1), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the fourth O site, O(4) is bonded to one Mg(1), two equivalent Mn(1), and one P(1) atom to form a mixture of distorted edge and corner-sharing OMgMn2P trigonal pyramids. is represented by the CIF card [CIF]
data_MgMn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.428
_cell_length_b   4.880
_cell_length_c   6.426
_cell_angle_alpha   94.463
_cell_angle_beta   86.871
_cell_angle_gamma   73.750
_symmetry_Int_Tables_number   1
_cell_volume   162.371
_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  0.500  0.500  0.500  1.0
  Mn  Mn1  1  0.929  0.780  0.730  1.0
  Mn  Mn2  1  0.071  0.220  0.270  1.0
  P  P3  1  0.337  0.152  0.766  1.0
  P  P4  1  0.663  0.848  0.234  1.0
  O  O5  1  0.692  0.154  0.286  1.0
  O  O6  1  0.618  0.165  0.718  1.0
  O  O7  1  0.225  0.273  0.985  1.0
  O  O8  1  0.185  0.352  0.599  1.0
  O  O9  1  0.775  0.727  0.015  1.0
  O  O10  1  0.308  0.846  0.714  1.0
  O  O11  1  0.815  0.648  0.401  1.0
  O  O12  1  0.382  0.835  0.282  1.0
[/CIF]
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