The structure described by K2Mn3(AsO4)3 is Esseneite-like structured and crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms to form distorted KO8 hexagonal bipyramids that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent As(1)O4 tetrahedra, edges with two equivalent K(1)O8 hexagonal bipyramids,  an edgeedge with one Mn(2)O6 octahedra, edges with four equivalent Mn(1)O6 octahedra,  an edgeedge with one As(2)O4 tetrahedra, and edges with two equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. In the second K site, K(2) is bonded in a distorted body-centered cubic geometry to four equivalent O(4) and four equivalent O(6) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(6), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with two equivalent As(2)O4 tetrahedra, corners with four equivalent As(1)O4 tetrahedra, edges with two equivalent K(1)O8 hexagonal bipyramids,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Mn(2)O6 octahedra. 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 octahedra that share corners with two equivalent K(1)O8 hexagonal bipyramids, corners with two equivalent As(2)O4 tetrahedra, corners with four equivalent As(1)O4 tetrahedra,  an edgeedge with one K(1)O8 hexagonal bipyramid, and edges with two equivalent Mn(1)O6 octahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form AsO4 tetrahedra that share  a cornercorner with one K(1)O8 hexagonal bipyramid, corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra, and  an edgeedge with one K(1)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 35-60°. In the second As site, As(2) is bonded to two equivalent O(3) and two equivalent O(6) atoms to form AsO4 tetrahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra, and  an edgeedge with one K(1)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 51-60°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one K(1), one Mn(1), one Mn(2), and one As(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one Mn(1), and one As(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one K(1), one Mn(1), one Mn(2), and one As(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent K(2), one Mn(2), and one As(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Mn(1) and one As(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent K(2), one Mn(1), and one As(2) atom. is represented by the CIF card [CIF]
data_K2Mn3(AsO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.980
_cell_length_b   8.980
_cell_length_c   6.997
_cell_angle_alpha   74.051
_cell_angle_beta   74.051
_cell_angle_gamma   93.059
_symmetry_Int_Tables_number   1
_cell_volume   516.629
_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
  K  K0  1  0.011  0.989  0.250  1.0
  K  K1  1  0.989  0.011  0.750  1.0
  K  K2  1  0.500  0.500  0.500  1.0
  K  K3  1  0.500  0.500  0.000  1.0
  Mn  Mn4  1  0.938  0.619  0.631  1.0
  Mn  Mn5  1  0.381  0.062  0.869  1.0
  Mn  Mn6  1  0.062  0.381  0.369  1.0
  Mn  Mn7  1  0.619  0.938  0.131  1.0
  Mn  Mn8  1  0.740  0.260  0.250  1.0
  Mn  Mn9  1  0.260  0.740  0.750  1.0
  As  As10  1  0.123  0.353  0.879  1.0
  As  As11  1  0.647  0.877  0.621  1.0
  As  As12  1  0.877  0.647  0.121  1.0
  As  As13  1  0.353  0.123  0.379  1.0
  As  As14  1  0.721  0.279  0.750  1.0
  As  As15  1  0.279  0.721  0.250  1.0
  O  O16  1  0.990  0.319  0.121  1.0
  O  O17  1  0.681  0.010  0.379  1.0
  O  O18  1  0.010  0.681  0.879  1.0
  O  O19  1  0.319  0.990  0.621  1.0
  O  O20  1  0.191  0.181  0.873  1.0
  O  O21  1  0.819  0.809  0.627  1.0
  O  O22  1  0.809  0.819  0.127  1.0
  O  O23  1  0.181  0.191  0.373  1.0
  O  O24  1  0.836  0.246  0.528  1.0
  O  O25  1  0.754  0.164  0.972  1.0
  O  O26  1  0.164  0.754  0.472  1.0
  O  O27  1  0.246  0.836  0.028  1.0
  O  O28  1  0.266  0.498  0.835  1.0
  O  O29  1  0.502  0.734  0.665  1.0
  O  O30  1  0.734  0.502  0.165  1.0
  O  O31  1  0.498  0.266  0.335  1.0
  O  O32  1  0.033  0.407  0.687  1.0
  O  O33  1  0.593  0.967  0.813  1.0
  O  O34  1  0.967  0.593  0.313  1.0
  O  O35  1  0.407  0.033  0.187  1.0
  O  O36  1  0.527  0.256  0.776  1.0
  O  O37  1  0.744  0.473  0.724  1.0
  O  O38  1  0.473  0.744  0.224  1.0
  O  O39  1  0.256  0.527  0.276  1.0
[/CIF]
.
The structure described by K2Mn3(AsO4)3 is Esseneite-like structured and crystallizes in the monoclinic C2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms to form distorted KO8 hexagonal bipyramids that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent As(1)O4 tetrahedra, edges with two equivalent K(1)O8 hexagonal bipyramids,  an edgeedge with one Mn(2)O6 octahedra, edges with four equivalent Mn(1)O6 octahedra,  an edgeedge with one As(2)O4 tetrahedra, and edges with two equivalent As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. In the second K site, K(2) is bonded in a distorted body-centered cubic geometry to four equivalent O(4) and four equivalent O(6) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(6), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with two equivalent As(2)O4 tetrahedra, corners with four equivalent As(1)O4 tetrahedra, edges with two equivalent K(1)O8 hexagonal bipyramids,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Mn(2)O6 octahedra. 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 octahedra that share corners with two equivalent K(1)O8 hexagonal bipyramids, corners with two equivalent As(2)O4 tetrahedra, corners with four equivalent As(1)O4 tetrahedra,  an edgeedge with one K(1)O8 hexagonal bipyramid, and edges with two equivalent Mn(1)O6 octahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form AsO4 tetrahedra that share  a cornercorner with one K(1)O8 hexagonal bipyramid, corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra, and  an edgeedge with one K(1)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 35-60°. In the second As site, As(2) is bonded to two equivalent O(3) and two equivalent O(6) atoms to form AsO4 tetrahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra, and  an edgeedge with one K(1)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 51-60°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one K(1), one Mn(1), one Mn(2), and one As(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one Mn(1), and one As(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one K(1), one Mn(1), one Mn(2), and one As(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent K(2), one Mn(2), and one As(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Mn(1) and one As(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent K(2), one Mn(1), and one As(2) atom. is represented by the CIF card [CIF]
data_K2Mn3(AsO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.980
_cell_length_b   8.980
_cell_length_c   6.997
_cell_angle_alpha   74.051
_cell_angle_beta   74.051
_cell_angle_gamma   93.059
_symmetry_Int_Tables_number   1
_cell_volume   516.629
_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
  K  K0  1  0.011  0.989  0.250  1.0
  K  K1  1  0.989  0.011  0.750  1.0
  K  K2  1  0.500  0.500  0.500  1.0
  K  K3  1  0.500  0.500  0.000  1.0
  Mn  Mn4  1  0.938  0.619  0.631  1.0
  Mn  Mn5  1  0.381  0.062  0.869  1.0
  Mn  Mn6  1  0.062  0.381  0.369  1.0
  Mn  Mn7  1  0.619  0.938  0.131  1.0
  Mn  Mn8  1  0.740  0.260  0.250  1.0
  Mn  Mn9  1  0.260  0.740  0.750  1.0
  As  As10  1  0.123  0.353  0.879  1.0
  As  As11  1  0.647  0.877  0.621  1.0
  As  As12  1  0.877  0.647  0.121  1.0
  As  As13  1  0.353  0.123  0.379  1.0
  As  As14  1  0.721  0.279  0.750  1.0
  As  As15  1  0.279  0.721  0.250  1.0
  O  O16  1  0.990  0.319  0.121  1.0
  O  O17  1  0.681  0.010  0.379  1.0
  O  O18  1  0.010  0.681  0.879  1.0
  O  O19  1  0.319  0.990  0.621  1.0
  O  O20  1  0.191  0.181  0.873  1.0
  O  O21  1  0.819  0.809  0.627  1.0
  O  O22  1  0.809  0.819  0.127  1.0
  O  O23  1  0.181  0.191  0.373  1.0
  O  O24  1  0.836  0.246  0.528  1.0
  O  O25  1  0.754  0.164  0.972  1.0
  O  O26  1  0.164  0.754  0.472  1.0
  O  O27  1  0.246  0.836  0.028  1.0
  O  O28  1  0.266  0.498  0.835  1.0
  O  O29  1  0.502  0.734  0.665  1.0
  O  O30  1  0.734  0.502  0.165  1.0
  O  O31  1  0.498  0.266  0.335  1.0
  O  O32  1  0.033  0.407  0.687  1.0
  O  O33  1  0.593  0.967  0.813  1.0
  O  O34  1  0.967  0.593  0.313  1.0
  O  O35  1  0.407  0.033  0.187  1.0
  O  O36  1  0.527  0.256  0.776  1.0
  O  O37  1  0.744  0.473  0.724  1.0
  O  O38  1  0.473  0.744  0.224  1.0
  O  O39  1  0.256  0.527  0.276  1.0
[/CIF]
.