The material described by Ba2Mn(AsO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one O(1), one O(3), one O(5), one O(6), one O(7), and two equivalent O(8) atoms to form distorted BaO7 pentagonal bipyramids that share corners with three equivalent Mn(1)O6 octahedra, corners with two equivalent Ba(1)O7 pentagonal bipyramids,  a cornercorner with one As(2)O4 tetrahedra, corners with four equivalent As(1)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-75°. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), one O(7), one O(8), and two equivalent O(2) atoms. Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form distorted MnO6 octahedra that share corners with three equivalent Ba(1)O7 pentagonal bipyramids, corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra,  an edgeedge with one Ba(1)O7 pentagonal bipyramid, and  an edgeedge with one As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(6), and one O(8) atom to form AsO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with four equivalent Ba(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-51°. In the second As site, As(2) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Ba(1)O7 pentagonal bipyramid,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Ba(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 38-66°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Mn(1), and one As(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ba(2) and one As(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ba(1), one Mn(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ba(2), one Mn(1), and one As(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Mn(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), one Mn(1), and one As(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Mn(1), and one As(2) atom. In the eighth O site, O(8) is bonded to one Ba(2), two equivalent Ba(1), and one As(1) atom to form distorted corner-sharing OBa3As tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba2Mn(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.341
_cell_length_b   5.609
_cell_length_c   17.771
_cell_angle_alpha   72.036
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   885.762
_cell_formula_units_Z   4
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
  Ba  Ba0  1  0.337  0.524  0.731  1.0
  Ba  Ba1  1  0.698  0.690  0.521  1.0
  Ba  Ba2  1  0.163  0.524  0.231  1.0
  Ba  Ba3  1  0.837  0.476  0.769  1.0
  Ba  Ba4  1  0.663  0.476  0.269  1.0
  Ba  Ba5  1  0.198  0.310  0.979  1.0
  Ba  Ba6  1  0.302  0.310  0.479  1.0
  Ba  Ba7  1  0.802  0.690  0.021  1.0
  Mn  Mn8  1  0.980  0.094  0.637  1.0
  Mn  Mn9  1  0.020  0.906  0.363  1.0
  Mn  Mn10  1  0.480  0.906  0.863  1.0
  Mn  Mn11  1  0.520  0.094  0.137  1.0
  As  As12  1  0.396  0.915  0.336  1.0
  As  As13  1  0.896  0.085  0.164  1.0
  As  As14  1  0.095  0.678  0.576  1.0
  As  As15  1  0.405  0.678  0.076  1.0
  As  As16  1  0.595  0.322  0.924  1.0
  As  As17  1  0.905  0.322  0.424  1.0
  As  As18  1  0.604  0.085  0.664  1.0
  As  As19  1  0.104  0.915  0.836  1.0
  O  O20  1  0.712  0.117  0.901  1.0
  O  O21  1  0.969  0.267  0.076  1.0
  O  O22  1  0.469  0.733  0.424  1.0
  O  O23  1  0.494  0.877  0.258  1.0
  O  O24  1  0.607  0.297  0.022  1.0
  O  O25  1  0.070  0.255  0.392  1.0
  O  O26  1  0.107  0.703  0.478  1.0
  O  O27  1  0.930  0.745  0.608  1.0
  O  O28  1  0.893  0.297  0.522  1.0
  O  O29  1  0.273  0.798  0.827  1.0
  O  O30  1  0.644  0.624  0.870  1.0
  O  O31  1  0.108  0.227  0.832  1.0
  O  O32  1  0.608  0.773  0.668  1.0
  O  O33  1  0.212  0.883  0.599  1.0
  O  O34  1  0.006  0.877  0.758  1.0
  O  O35  1  0.144  0.376  0.630  1.0
  O  O36  1  0.031  0.733  0.924  1.0
  O  O37  1  0.892  0.773  0.168  1.0
  O  O38  1  0.773  0.202  0.673  1.0
  O  O39  1  0.727  0.202  0.173  1.0
  O  O40  1  0.788  0.117  0.401  1.0
  O  O41  1  0.506  0.123  0.742  1.0
  O  O42  1  0.393  0.703  0.978  1.0
  O  O43  1  0.856  0.624  0.370  1.0
  O  O44  1  0.227  0.798  0.327  1.0
  O  O45  1  0.994  0.123  0.242  1.0
  O  O46  1  0.531  0.267  0.576  1.0
  O  O47  1  0.570  0.745  0.108  1.0
  O  O48  1  0.392  0.227  0.332  1.0
  O  O49  1  0.288  0.883  0.099  1.0
  O  O50  1  0.430  0.255  0.892  1.0
  O  O51  1  0.356  0.376  0.130  1.0
[/CIF]
.
The material described by Ba2Mn(AsO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one O(1), one O(3), one O(5), one O(6), one O(7), and two equivalent O(8) atoms to form distorted BaO7 pentagonal bipyramids that share corners with three equivalent Mn(1)O6 octahedra, corners with two equivalent Ba(1)O7 pentagonal bipyramids,  a cornercorner with one As(2)O4 tetrahedra, corners with four equivalent As(1)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-75°. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), one O(7), one O(8), and two equivalent O(2) atoms. Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form distorted MnO6 octahedra that share corners with three equivalent Ba(1)O7 pentagonal bipyramids, corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra,  an edgeedge with one Ba(1)O7 pentagonal bipyramid, and  an edgeedge with one As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(6), and one O(8) atom to form AsO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with four equivalent Ba(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-51°. In the second As site, As(2) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Ba(1)O7 pentagonal bipyramid,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Ba(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 38-66°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Mn(1), and one As(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ba(2) and one As(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ba(1), one Mn(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ba(2), one Mn(1), and one As(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Mn(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), one Mn(1), and one As(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Mn(1), and one As(2) atom. In the eighth O site, O(8) is bonded to one Ba(2), two equivalent Ba(1), and one As(1) atom to form distorted corner-sharing OBa3As tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba2Mn(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.341
_cell_length_b   5.609
_cell_length_c   17.771
_cell_angle_alpha   72.036
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   885.762
_cell_formula_units_Z   4
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
  Ba  Ba0  1  0.337  0.524  0.731  1.0
  Ba  Ba1  1  0.698  0.690  0.521  1.0
  Ba  Ba2  1  0.163  0.524  0.231  1.0
  Ba  Ba3  1  0.837  0.476  0.769  1.0
  Ba  Ba4  1  0.663  0.476  0.269  1.0
  Ba  Ba5  1  0.198  0.310  0.979  1.0
  Ba  Ba6  1  0.302  0.310  0.479  1.0
  Ba  Ba7  1  0.802  0.690  0.021  1.0
  Mn  Mn8  1  0.980  0.094  0.637  1.0
  Mn  Mn9  1  0.020  0.906  0.363  1.0
  Mn  Mn10  1  0.480  0.906  0.863  1.0
  Mn  Mn11  1  0.520  0.094  0.137  1.0
  As  As12  1  0.396  0.915  0.336  1.0
  As  As13  1  0.896  0.085  0.164  1.0
  As  As14  1  0.095  0.678  0.576  1.0
  As  As15  1  0.405  0.678  0.076  1.0
  As  As16  1  0.595  0.322  0.924  1.0
  As  As17  1  0.905  0.322  0.424  1.0
  As  As18  1  0.604  0.085  0.664  1.0
  As  As19  1  0.104  0.915  0.836  1.0
  O  O20  1  0.712  0.117  0.901  1.0
  O  O21  1  0.969  0.267  0.076  1.0
  O  O22  1  0.469  0.733  0.424  1.0
  O  O23  1  0.494  0.877  0.258  1.0
  O  O24  1  0.607  0.297  0.022  1.0
  O  O25  1  0.070  0.255  0.392  1.0
  O  O26  1  0.107  0.703  0.478  1.0
  O  O27  1  0.930  0.745  0.608  1.0
  O  O28  1  0.893  0.297  0.522  1.0
  O  O29  1  0.273  0.798  0.827  1.0
  O  O30  1  0.644  0.624  0.870  1.0
  O  O31  1  0.108  0.227  0.832  1.0
  O  O32  1  0.608  0.773  0.668  1.0
  O  O33  1  0.212  0.883  0.599  1.0
  O  O34  1  0.006  0.877  0.758  1.0
  O  O35  1  0.144  0.376  0.630  1.0
  O  O36  1  0.031  0.733  0.924  1.0
  O  O37  1  0.892  0.773  0.168  1.0
  O  O38  1  0.773  0.202  0.673  1.0
  O  O39  1  0.727  0.202  0.173  1.0
  O  O40  1  0.788  0.117  0.401  1.0
  O  O41  1  0.506  0.123  0.742  1.0
  O  O42  1  0.393  0.703  0.978  1.0
  O  O43  1  0.856  0.624  0.370  1.0
  O  O44  1  0.227  0.798  0.327  1.0
  O  O45  1  0.994  0.123  0.242  1.0
  O  O46  1  0.531  0.267  0.576  1.0
  O  O47  1  0.570  0.745  0.108  1.0
  O  O48  1  0.392  0.227  0.332  1.0
  O  O49  1  0.288  0.883  0.099  1.0
  O  O50  1  0.430  0.255  0.892  1.0
  O  O51  1  0.356  0.376  0.130  1.0
[/CIF]
.