The compound described by MgCo3(P2O7)2 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted MgO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra, corners with four equivalent P(1)O4 tetrahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(7) atoms to form distorted CoO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(2)O6 octahedra. In the second Co site, Co(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with four equivalent P(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, corners with three equivalent Co(1)O6 octahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-71°. In the second P site, P(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with three equivalent Co(1)O6 octahedra, and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-63°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Co(1) and one P(1) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one P(2) atom. In the third O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Co(1) and one P(2) atom. In the fourth O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one Co(2), and one P(2) atom. In the fifth O site, O(2) is bonded to one Mg(1), one Co(1), one Co(2), and one P(1) atom to form distorted corner-sharing OMgCo2P tetrahedra. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Co(1), and one P(1) atom. In the seventh O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. is represented by the CIF card [CIF]
data_MgCo3(P2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.323
_cell_length_b   7.182
_cell_length_c   9.561
_cell_angle_alpha   67.277
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   463.765
_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
  Mg  Mg0  1  0.000  0.500  0.000  1.0
  Mg  Mg1  1  0.500  0.500  0.500  1.0
  Co  Co2  1  0.133  0.817  0.522  1.0
  Co  Co3  1  0.633  0.183  0.978  1.0
  Co  Co4  1  0.867  0.183  0.478  1.0
  Co  Co5  1  0.367  0.817  0.022  1.0
  Co  Co6  1  0.000  0.000  0.000  1.0
  Co  Co7  1  0.500  0.000  0.500  1.0
  P  P8  1  0.909  0.420  0.698  1.0
  P  P9  1  0.409  0.580  0.802  1.0
  P  P10  1  0.091  0.580  0.302  1.0
  P  P11  1  0.591  0.420  0.198  1.0
  P  P12  1  0.200  0.135  0.686  1.0
  P  P13  1  0.700  0.865  0.814  1.0
  P  P14  1  0.800  0.865  0.314  1.0
  P  P15  1  0.300  0.135  0.186  1.0
  O  O16  1  0.380  0.196  0.602  1.0
  O  O17  1  0.880  0.804  0.898  1.0
  O  O18  1  0.620  0.804  0.398  1.0
  O  O19  1  0.120  0.196  0.102  1.0
  O  O20  1  0.383  0.697  0.629  1.0
  O  O21  1  0.883  0.303  0.871  1.0
  O  O22  1  0.617  0.303  0.371  1.0
  O  O23  1  0.117  0.697  0.129  1.0
  O  O24  1  0.759  0.378  0.605  1.0
  O  O25  1  0.259  0.622  0.895  1.0
  O  O26  1  0.241  0.622  0.395  1.0
  O  O27  1  0.741  0.378  0.105  1.0
  O  O28  1  0.098  0.341  0.659  1.0
  O  O29  1  0.598  0.659  0.841  1.0
  O  O30  1  0.902  0.659  0.341  1.0
  O  O31  1  0.402  0.341  0.159  1.0
  O  O32  1  0.551  0.637  0.165  1.0
  O  O33  1  0.051  0.363  0.335  1.0
  O  O34  1  0.449  0.363  0.835  1.0
  O  O35  1  0.949  0.637  0.665  1.0
  O  O36  1  0.791  0.972  0.142  1.0
  O  O37  1  0.291  0.028  0.358  1.0
  O  O38  1  0.209  0.028  0.858  1.0
  O  O39  1  0.709  0.972  0.642  1.0
  O  O40  1  0.420  0.024  0.116  1.0
  O  O41  1  0.920  0.976  0.384  1.0
  O  O42  1  0.580  0.976  0.884  1.0
  O  O43  1  0.080  0.024  0.616  1.0
[/CIF]
.
The compound described by MgCo3(P2O7)2 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted MgO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra, corners with four equivalent P(1)O4 tetrahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(7) atoms to form distorted CoO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(2)O6 octahedra. In the second Co site, Co(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with four equivalent P(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, corners with three equivalent Co(1)O6 octahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-71°. In the second P site, P(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with three equivalent Co(1)O6 octahedra, and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-63°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Co(1) and one P(1) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Co(1), one Co(2), and one P(2) atom. In the third O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Co(1) and one P(2) atom. In the fourth O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one Co(2), and one P(2) atom. In the fifth O site, O(2) is bonded to one Mg(1), one Co(1), one Co(2), and one P(1) atom to form distorted corner-sharing OMgCo2P tetrahedra. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Co(1), and one P(1) atom. In the seventh O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. is represented by the CIF card [CIF]
data_MgCo3(P2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.323
_cell_length_b   7.182
_cell_length_c   9.561
_cell_angle_alpha   67.277
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   463.765
_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
  Mg  Mg0  1  0.000  0.500  0.000  1.0
  Mg  Mg1  1  0.500  0.500  0.500  1.0
  Co  Co2  1  0.133  0.817  0.522  1.0
  Co  Co3  1  0.633  0.183  0.978  1.0
  Co  Co4  1  0.867  0.183  0.478  1.0
  Co  Co5  1  0.367  0.817  0.022  1.0
  Co  Co6  1  0.000  0.000  0.000  1.0
  Co  Co7  1  0.500  0.000  0.500  1.0
  P  P8  1  0.909  0.420  0.698  1.0
  P  P9  1  0.409  0.580  0.802  1.0
  P  P10  1  0.091  0.580  0.302  1.0
  P  P11  1  0.591  0.420  0.198  1.0
  P  P12  1  0.200  0.135  0.686  1.0
  P  P13  1  0.700  0.865  0.814  1.0
  P  P14  1  0.800  0.865  0.314  1.0
  P  P15  1  0.300  0.135  0.186  1.0
  O  O16  1  0.380  0.196  0.602  1.0
  O  O17  1  0.880  0.804  0.898  1.0
  O  O18  1  0.620  0.804  0.398  1.0
  O  O19  1  0.120  0.196  0.102  1.0
  O  O20  1  0.383  0.697  0.629  1.0
  O  O21  1  0.883  0.303  0.871  1.0
  O  O22  1  0.617  0.303  0.371  1.0
  O  O23  1  0.117  0.697  0.129  1.0
  O  O24  1  0.759  0.378  0.605  1.0
  O  O25  1  0.259  0.622  0.895  1.0
  O  O26  1  0.241  0.622  0.395  1.0
  O  O27  1  0.741  0.378  0.105  1.0
  O  O28  1  0.098  0.341  0.659  1.0
  O  O29  1  0.598  0.659  0.841  1.0
  O  O30  1  0.902  0.659  0.341  1.0
  O  O31  1  0.402  0.341  0.159  1.0
  O  O32  1  0.551  0.637  0.165  1.0
  O  O33  1  0.051  0.363  0.335  1.0
  O  O34  1  0.449  0.363  0.835  1.0
  O  O35  1  0.949  0.637  0.665  1.0
  O  O36  1  0.791  0.972  0.142  1.0
  O  O37  1  0.291  0.028  0.358  1.0
  O  O38  1  0.209  0.028  0.858  1.0
  O  O39  1  0.709  0.972  0.642  1.0
  O  O40  1  0.420  0.024  0.116  1.0
  O  O41  1  0.920  0.976  0.384  1.0
  O  O42  1  0.580  0.976  0.884  1.0
  O  O43  1  0.080  0.024  0.616  1.0
[/CIF]
.