The compound described by MgMn2(PO4)2 crystallizes in the monoclinic C2 space group. Mg(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted MgO6 pentagonal pyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, edges with two equivalent Mn(1)O6 pentagonal pyramids, edges with two equivalent Mn(2)O6 pentagonal pyramids, and  an edgeedge with one P(1)O4 tetrahedra. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted MnO6 pentagonal pyramids that share corners with four equivalent Mn(2)O6 pentagonal pyramids, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 pentagonal pyramids, and  an edgeedge with one P(1)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form distorted MnO6 pentagonal pyramids that share corners with four equivalent Mn(1)O6 pentagonal pyramids, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 pentagonal pyramids, and  an edgeedge with one P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form PO4 tetrahedra that share corners with two equivalent Mg(1)O6 pentagonal pyramids, corners with two equivalent Mn(1)O6 pentagonal pyramids, corners with two equivalent Mn(2)O6 pentagonal pyramids,  an edgeedge with one Mg(1)O6 pentagonal pyramid, and  an edgeedge with one Mn(1)O6 pentagonal pyramid. In the second P site, P(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with two equivalent Mg(1)O6 pentagonal pyramids, corners with two equivalent Mn(1)O6 pentagonal pyramids, corners with two equivalent Mn(2)O6 pentagonal pyramids, and  an edgeedge with one Mn(2)O6 pentagonal pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(2) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(1), one Mn(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgMn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.548
_cell_length_b   6.393
_cell_length_c   5.548
_cell_angle_alpha   76.636
_cell_angle_beta   62.623
_cell_angle_gamma   103.373
_symmetry_Int_Tables_number   1
_cell_volume   156.496
_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  0.822  0.250  0.823  1.0
  Mn  Mn1  1  0.445  0.250  0.445  1.0
  Mn  Mn2  1  0.177  0.750  0.177  1.0
  P  P3  1  0.118  0.250  0.117  1.0
  P  P4  1  0.868  0.750  0.867  1.0
  O  O5  1  0.758  0.584  0.182  1.0
  O  O6  1  0.788  0.112  0.244  1.0
  O  O7  1  0.134  0.390  0.314  1.0
  O  O8  1  0.183  0.916  0.758  1.0
  O  O9  1  0.680  0.898  0.871  1.0
  O  O10  1  0.244  0.388  0.788  1.0
  O  O11  1  0.871  0.602  0.680  1.0
  O  O12  1  0.314  0.110  0.133  1.0
[/CIF]
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The compound described by MgMn2(PO4)2 crystallizes in the monoclinic C2 space group. Mg(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted MgO6 pentagonal pyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, edges with two equivalent Mn(1)O6 pentagonal pyramids, edges with two equivalent Mn(2)O6 pentagonal pyramids, and  an edgeedge with one P(1)O4 tetrahedra. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted MnO6 pentagonal pyramids that share corners with four equivalent Mn(2)O6 pentagonal pyramids, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 pentagonal pyramids, and  an edgeedge with one P(1)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form distorted MnO6 pentagonal pyramids that share corners with four equivalent Mn(1)O6 pentagonal pyramids, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 pentagonal pyramids, and  an edgeedge with one P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form PO4 tetrahedra that share corners with two equivalent Mg(1)O6 pentagonal pyramids, corners with two equivalent Mn(1)O6 pentagonal pyramids, corners with two equivalent Mn(2)O6 pentagonal pyramids,  an edgeedge with one Mg(1)O6 pentagonal pyramid, and  an edgeedge with one Mn(1)O6 pentagonal pyramid. In the second P site, P(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with two equivalent Mg(1)O6 pentagonal pyramids, corners with two equivalent Mn(1)O6 pentagonal pyramids, corners with two equivalent Mn(2)O6 pentagonal pyramids, and  an edgeedge with one Mn(2)O6 pentagonal pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(2) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Mn(1), one Mn(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgMn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.548
_cell_length_b   6.393
_cell_length_c   5.548
_cell_angle_alpha   76.636
_cell_angle_beta   62.623
_cell_angle_gamma   103.373
_symmetry_Int_Tables_number   1
_cell_volume   156.496
_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  0.822  0.250  0.823  1.0
  Mn  Mn1  1  0.445  0.250  0.445  1.0
  Mn  Mn2  1  0.177  0.750  0.177  1.0
  P  P3  1  0.118  0.250  0.117  1.0
  P  P4  1  0.868  0.750  0.867  1.0
  O  O5  1  0.758  0.584  0.182  1.0
  O  O6  1  0.788  0.112  0.244  1.0
  O  O7  1  0.134  0.390  0.314  1.0
  O  O8  1  0.183  0.916  0.758  1.0
  O  O9  1  0.680  0.898  0.871  1.0
  O  O10  1  0.244  0.388  0.788  1.0
  O  O11  1  0.871  0.602  0.680  1.0
  O  O12  1  0.314  0.110  0.133  1.0
[/CIF]
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