The crystal structure described by NbCr2Mn3(PO4)6 crystallizes in the trigonal R3 space group. Nb(1) is bonded to three equivalent O(3) and three equivalent O(6) atoms to form NbO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Cr(1)O6 octahedra. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to three equivalent O(2) and three equivalent O(6) atoms to form distorted CrO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a faceface with one Nb(1)O6 octahedra, and  a faceface with one Mn(1)O6 pentagonal pyramid. In the second Cr site, Cr(2) is bonded to three equivalent O(4) and three equivalent O(7) atoms to form CrO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a faceface with one Mn(3)O6 octahedra, and  a faceface with one Mn(2)O6 pentagonal pyramid. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent O(2) and three equivalent O(5) atoms to form distorted MnO6 pentagonal pyramids that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Cr(1)O6 octahedra. In the second Mn site, Mn(2) is bonded to three equivalent O(1) and three equivalent O(4) atoms to form distorted MnO6 pentagonal pyramids that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Cr(2)O6 octahedra. In the third Mn site, Mn(3) is bonded to three equivalent O(7) and three equivalent O(8) atoms to form distorted MnO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Cr(2)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(8) atom to form PO4 tetrahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(1)O6 pentagonal pyramid, and  a cornercorner with one Mn(2)O6 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 23-39°. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(1)O6 pentagonal pyramid, and  a cornercorner with one Mn(2)O6 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 35-56°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Cr(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 Nb(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Cr(2), one Mn(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Nb(1), one Cr(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Cr(2), one Mn(3), and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Mn(3) and one P(1) atom. is represented by the CIF card [CIF]
data_Mn3NbCr2(PO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.562
_cell_length_b   8.562
_cell_length_c   8.562
_cell_angle_alpha   61.573
_cell_angle_beta   61.573
_cell_angle_gamma   61.573
_symmetry_Int_Tables_number   1
_cell_volume   459.445
_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
  Mn  Mn0  1  0.149  0.149  0.149  1.0
  Mn  Mn1  1  0.353  0.353  0.353  1.0
  Mn  Mn2  1  0.647  0.647  0.647  1.0
  Nb  Nb3  1  0.853  0.853  0.853  1.0
  Cr  Cr4  1  0.003  0.003  0.003  1.0
  Cr  Cr5  1  0.501  0.501  0.501  1.0
  P  P6  1  0.443  0.748  0.054  1.0
  P  P7  1  0.548  0.254  0.947  1.0
  P  P8  1  0.947  0.548  0.254  1.0
  P  P9  1  0.254  0.947  0.548  1.0
  P  P10  1  0.748  0.054  0.443  1.0
  P  P11  1  0.054  0.443  0.748  1.0
  O  O12  1  0.321  0.095  0.518  1.0
  O  O13  1  0.518  0.321  0.095  1.0
  O  O14  1  0.904  0.070  0.247  1.0
  O  O15  1  0.095  0.518  0.321  1.0
  O  O16  1  0.828  0.987  0.607  1.0
  O  O17  1  0.604  0.250  0.447  1.0
  O  O18  1  0.070  0.247  0.904  1.0
  O  O19  1  0.250  0.447  0.604  1.0
  O  O20  1  0.403  0.175  0.989  1.0
  O  O21  1  0.447  0.604  0.250  1.0
  O  O22  1  0.755  0.094  0.927  1.0
  O  O23  1  0.989  0.403  0.175  1.0
  O  O24  1  0.987  0.607  0.828  1.0
  O  O25  1  0.247  0.904  0.070  1.0
  O  O26  1  0.567  0.401  0.744  1.0
  O  O27  1  0.607  0.828  0.987  1.0
  O  O28  1  0.744  0.567  0.401  1.0
  O  O29  1  0.927  0.755  0.094  1.0
  O  O30  1  0.401  0.744  0.567  1.0
  O  O31  1  0.175  0.989  0.403  1.0
  O  O32  1  0.903  0.486  0.678  1.0
  O  O33  1  0.094  0.927  0.755  1.0
  O  O34  1  0.486  0.678  0.903  1.0
  O  O35  1  0.678  0.903  0.486  1.0
[/CIF]
.
The crystal structure described by NbCr2Mn3(PO4)6 crystallizes in the trigonal R3 space group. Nb(1) is bonded to three equivalent O(3) and three equivalent O(6) atoms to form NbO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Cr(1)O6 octahedra. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to three equivalent O(2) and three equivalent O(6) atoms to form distorted CrO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a faceface with one Nb(1)O6 octahedra, and  a faceface with one Mn(1)O6 pentagonal pyramid. In the second Cr site, Cr(2) is bonded to three equivalent O(4) and three equivalent O(7) atoms to form CrO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  a faceface with one Mn(3)O6 octahedra, and  a faceface with one Mn(2)O6 pentagonal pyramid. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent O(2) and three equivalent O(5) atoms to form distorted MnO6 pentagonal pyramids that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Cr(1)O6 octahedra. In the second Mn site, Mn(2) is bonded to three equivalent O(1) and three equivalent O(4) atoms to form distorted MnO6 pentagonal pyramids that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Cr(2)O6 octahedra. In the third Mn site, Mn(3) is bonded to three equivalent O(7) and three equivalent O(8) atoms to form distorted MnO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Cr(2)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(8) atom to form PO4 tetrahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(1)O6 pentagonal pyramid, and  a cornercorner with one Mn(2)O6 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 23-39°. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(1)O6 pentagonal pyramid, and  a cornercorner with one Mn(2)O6 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 35-56°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Cr(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 Nb(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Cr(2), one Mn(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Nb(1), one Cr(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Cr(2), one Mn(3), and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Mn(3) and one P(1) atom. is represented by the CIF card [CIF]
data_Mn3NbCr2(PO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.562
_cell_length_b   8.562
_cell_length_c   8.562
_cell_angle_alpha   61.573
_cell_angle_beta   61.573
_cell_angle_gamma   61.573
_symmetry_Int_Tables_number   1
_cell_volume   459.445
_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
  Mn  Mn0  1  0.149  0.149  0.149  1.0
  Mn  Mn1  1  0.353  0.353  0.353  1.0
  Mn  Mn2  1  0.647  0.647  0.647  1.0
  Nb  Nb3  1  0.853  0.853  0.853  1.0
  Cr  Cr4  1  0.003  0.003  0.003  1.0
  Cr  Cr5  1  0.501  0.501  0.501  1.0
  P  P6  1  0.443  0.748  0.054  1.0
  P  P7  1  0.548  0.254  0.947  1.0
  P  P8  1  0.947  0.548  0.254  1.0
  P  P9  1  0.254  0.947  0.548  1.0
  P  P10  1  0.748  0.054  0.443  1.0
  P  P11  1  0.054  0.443  0.748  1.0
  O  O12  1  0.321  0.095  0.518  1.0
  O  O13  1  0.518  0.321  0.095  1.0
  O  O14  1  0.904  0.070  0.247  1.0
  O  O15  1  0.095  0.518  0.321  1.0
  O  O16  1  0.828  0.987  0.607  1.0
  O  O17  1  0.604  0.250  0.447  1.0
  O  O18  1  0.070  0.247  0.904  1.0
  O  O19  1  0.250  0.447  0.604  1.0
  O  O20  1  0.403  0.175  0.989  1.0
  O  O21  1  0.447  0.604  0.250  1.0
  O  O22  1  0.755  0.094  0.927  1.0
  O  O23  1  0.989  0.403  0.175  1.0
  O  O24  1  0.987  0.607  0.828  1.0
  O  O25  1  0.247  0.904  0.070  1.0
  O  O26  1  0.567  0.401  0.744  1.0
  O  O27  1  0.607  0.828  0.987  1.0
  O  O28  1  0.744  0.567  0.401  1.0
  O  O29  1  0.927  0.755  0.094  1.0
  O  O30  1  0.401  0.744  0.567  1.0
  O  O31  1  0.175  0.989  0.403  1.0
  O  O32  1  0.903  0.486  0.678  1.0
  O  O33  1  0.094  0.927  0.755  1.0
  O  O34  1  0.486  0.678  0.903  1.0
  O  O35  1  0.678  0.903  0.486  1.0
[/CIF]
.