The compound described by Ta6Mn2FeO18 is Hydrophilite-derived structured and crystallizes in the monoclinic C2/m space group. There are six inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(12), one O(14), one O(4), one O(7), and two equivalent O(1) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Ta(5)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-54°. In the second Ta site, Ta(2) is bonded to one O(6), one O(9), two equivalent O(13), and two equivalent O(2) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra, corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(2)O6 octahedra, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. In the third Ta site, Ta(3) is bonded to one O(12), one O(14), one O(5), one O(8), and two equivalent O(3) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. In the fourth Ta site, Ta(4) is bonded to one O(4), one O(8), two equivalent O(10), and two equivalent O(2) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  an edgeedge with one Ta(6)O6 octahedra, and  an edgeedge with one Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-55°. In the fifth Ta site, Ta(5) is bonded to one O(5), one O(9), two equivalent O(1), and two equivalent O(11) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra,  an edgeedge with one Ta(5)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-54°. In the sixth Ta site, Ta(6) is bonded to one O(6), one O(7), two equivalent O(10), and two equivalent O(3) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  an edgeedge with one Ta(4)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(5), one O(6), one O(8), one O(9), and two equivalent O(10) atoms to form MnO6 octahedra that share corners with two equivalent Ta(5)O6 octahedra, corners with three equivalent Ta(4)O6 octahedra, corners with three equivalent Ta(6)O6 octahedra,  an edgeedge with one Ta(2)O6 octahedra, and  an edgeedge with one Ta(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. In the second Mn site, Mn(2) is bonded to two equivalent O(11), two equivalent O(4), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, corners with four equivalent Ta(5)O6 octahedra, and edges with two equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the third Mn site, Mn(3) is bonded to two equivalent O(12) and four equivalent O(2) atoms to form MnO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with four equivalent Ta(2)O6 octahedra, and edges with two equivalent Ta(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. Fe(1) is bonded to one O(13), one O(14), two equivalent O(1), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Ta(2)O6 octahedra, corners with three equivalent Ta(1)O6 octahedra, corners with three equivalent Ta(3)O6 octahedra,  an edgeedge with one Ta(5)O6 octahedra, and  an edgeedge with one Ta(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(5), and one Fe(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(4), and one Mn(3) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(6), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(4), and one Mn(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(5), and one Mn(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(6), and one Mn(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(6), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(4), and one Mn(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(5), and one Mn(1) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Ta(4), one Ta(6), and one Mn(1) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to two equivalent Ta(5) and one Mn(2) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Ta(1), one Ta(3), and one Mn(3) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to two equivalent Ta(2) and one Fe(1) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Ta(1), one Ta(3), and one Fe(1) atom. is represented by the CIF card [CIF]
data_Ta6Mn2FeO18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.533
_cell_length_b   10.533
_cell_length_c   11.582
_cell_angle_alpha   58.200
_cell_angle_beta   58.200
_cell_angle_gamma   37.943
_symmetry_Int_Tables_number   1
_cell_volume   656.119
_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
  Ta  Ta0  1  0.112  0.112  0.610  1.0
  Ta  Ta1  1  0.444  0.444  0.945  1.0
  Ta  Ta2  1  0.777  0.777  0.278  1.0
  Ta  Ta3  1  0.110  0.110  0.111  1.0
  Ta  Ta4  1  0.444  0.444  0.443  1.0
  Ta  Ta5  1  0.777  0.777  0.777  1.0
  Ta  Ta6  1  0.888  0.888  0.390  1.0
  Ta  Ta7  1  0.223  0.223  0.722  1.0
  Ta  Ta8  1  0.556  0.556  0.055  1.0
  Ta  Ta9  1  0.223  0.223  0.223  1.0
  Ta  Ta10  1  0.556  0.556  0.557  1.0
  Ta  Ta11  1  0.890  0.890  0.889  1.0
  Mn  Mn12  1  0.666  0.666  0.166  1.0
  Mn  Mn13  1  0.334  0.334  0.834  1.0
  Mn  Mn14  1  0.000  0.000  0.500  1.0
  Mn  Mn15  1  0.000  0.000  0.000  1.0
  Fe  Fe16  1  0.666  0.666  0.667  1.0
  Fe  Fe17  1  0.334  0.334  0.333  1.0
  O  O18  1  0.399  0.814  0.606  1.0
  O  O19  1  0.731  0.147  0.940  1.0
  O  O20  1  0.066  0.480  0.272  1.0
  O  O21  1  0.814  0.399  0.606  1.0
  O  O22  1  0.147  0.731  0.940  1.0
  O  O23  1  0.480  0.066  0.272  1.0
  O  O24  1  0.007  0.007  0.301  1.0
  O  O25  1  0.342  0.342  0.634  1.0
  O  O26  1  0.675  0.675  0.968  1.0
  O  O27  1  0.870  0.870  0.577  1.0
  O  O28  1  0.204  0.204  0.910  1.0
  O  O29  1  0.537  0.537  0.243  1.0
  O  O30  1  0.601  0.186  0.394  1.0
  O  O31  1  0.934  0.520  0.728  1.0
  O  O32  1  0.269  0.853  0.060  1.0
  O  O33  1  0.186  0.601  0.394  1.0
  O  O34  1  0.520  0.934  0.728  1.0
  O  O35  1  0.853  0.269  0.060  1.0
  O  O36  1  0.993  0.993  0.699  1.0
  O  O37  1  0.325  0.325  0.032  1.0
  O  O38  1  0.658  0.658  0.366  1.0
  O  O39  1  0.130  0.130  0.423  1.0
  O  O40  1  0.463  0.463  0.757  1.0
  O  O41  1  0.796  0.796  0.090  1.0
  O  O42  1  0.982  0.350  0.167  1.0
  O  O43  1  0.650  0.018  0.833  1.0
  O  O44  1  0.317  0.683  0.500  1.0
  O  O45  1  0.350  0.982  0.167  1.0
  O  O46  1  0.018  0.650  0.833  1.0
  O  O47  1  0.683  0.317  0.500  1.0
  O  O48  1  0.893  0.893  0.212  1.0
  O  O49  1  0.562  0.562  0.875  1.0
  O  O50  1  0.231  0.231  0.540  1.0
  O  O51  1  0.769  0.769  0.460  1.0
  O  O52  1  0.438  0.438  0.125  1.0
  O  O53  1  0.107  0.107  0.788  1.0
[/CIF]
.
The compound described by Ta6Mn2FeO18 is Hydrophilite-derived structured and crystallizes in the monoclinic C2/m space group. There are six inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(12), one O(14), one O(4), one O(7), and two equivalent O(1) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Ta(5)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(3)O6 octahedra, and  an edgeedge with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-54°. In the second Ta site, Ta(2) is bonded to one O(6), one O(9), two equivalent O(13), and two equivalent O(2) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Ta(6)O6 octahedra, corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(2)O6 octahedra, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. In the third Ta site, Ta(3) is bonded to one O(12), one O(14), one O(5), one O(8), and two equivalent O(3) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(4)O6 octahedra,  a cornercorner with one Ta(5)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra,  an edgeedge with one Ta(1)O6 octahedra, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. In the fourth Ta site, Ta(4) is bonded to one O(4), one O(8), two equivalent O(10), and two equivalent O(2) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  an edgeedge with one Ta(6)O6 octahedra, and  an edgeedge with one Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-55°. In the fifth Ta site, Ta(5) is bonded to one O(5), one O(9), two equivalent O(1), and two equivalent O(11) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Ta(3)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra,  an edgeedge with one Ta(5)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-54°. In the sixth Ta site, Ta(6) is bonded to one O(6), one O(7), two equivalent O(10), and two equivalent O(3) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra,  a cornercorner with one Ta(2)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  an edgeedge with one Ta(4)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(5), one O(6), one O(8), one O(9), and two equivalent O(10) atoms to form MnO6 octahedra that share corners with two equivalent Ta(5)O6 octahedra, corners with three equivalent Ta(4)O6 octahedra, corners with three equivalent Ta(6)O6 octahedra,  an edgeedge with one Ta(2)O6 octahedra, and  an edgeedge with one Ta(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. In the second Mn site, Mn(2) is bonded to two equivalent O(11), two equivalent O(4), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with two equivalent Ta(4)O6 octahedra, corners with two equivalent Ta(6)O6 octahedra, corners with four equivalent Ta(5)O6 octahedra, and edges with two equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the third Mn site, Mn(3) is bonded to two equivalent O(12) and four equivalent O(2) atoms to form MnO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, corners with four equivalent Ta(2)O6 octahedra, and edges with two equivalent Ta(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. Fe(1) is bonded to one O(13), one O(14), two equivalent O(1), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Ta(2)O6 octahedra, corners with three equivalent Ta(1)O6 octahedra, corners with three equivalent Ta(3)O6 octahedra,  an edgeedge with one Ta(5)O6 octahedra, and  an edgeedge with one Ta(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(5), and one Fe(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(4), and one Mn(3) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(6), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(4), and one Mn(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(5), and one Mn(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(6), and one Mn(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ta(1), one Ta(6), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Ta(3), one Ta(4), and one Mn(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ta(2), one Ta(5), and one Mn(1) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Ta(4), one Ta(6), and one Mn(1) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to two equivalent Ta(5) and one Mn(2) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Ta(1), one Ta(3), and one Mn(3) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to two equivalent Ta(2) and one Fe(1) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Ta(1), one Ta(3), and one Fe(1) atom. is represented by the CIF card [CIF]
data_Ta6Mn2FeO18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.533
_cell_length_b   10.533
_cell_length_c   11.582
_cell_angle_alpha   58.200
_cell_angle_beta   58.200
_cell_angle_gamma   37.943
_symmetry_Int_Tables_number   1
_cell_volume   656.119
_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
  Ta  Ta0  1  0.112  0.112  0.610  1.0
  Ta  Ta1  1  0.444  0.444  0.945  1.0
  Ta  Ta2  1  0.777  0.777  0.278  1.0
  Ta  Ta3  1  0.110  0.110  0.111  1.0
  Ta  Ta4  1  0.444  0.444  0.443  1.0
  Ta  Ta5  1  0.777  0.777  0.777  1.0
  Ta  Ta6  1  0.888  0.888  0.390  1.0
  Ta  Ta7  1  0.223  0.223  0.722  1.0
  Ta  Ta8  1  0.556  0.556  0.055  1.0
  Ta  Ta9  1  0.223  0.223  0.223  1.0
  Ta  Ta10  1  0.556  0.556  0.557  1.0
  Ta  Ta11  1  0.890  0.890  0.889  1.0
  Mn  Mn12  1  0.666  0.666  0.166  1.0
  Mn  Mn13  1  0.334  0.334  0.834  1.0
  Mn  Mn14  1  0.000  0.000  0.500  1.0
  Mn  Mn15  1  0.000  0.000  0.000  1.0
  Fe  Fe16  1  0.666  0.666  0.667  1.0
  Fe  Fe17  1  0.334  0.334  0.333  1.0
  O  O18  1  0.399  0.814  0.606  1.0
  O  O19  1  0.731  0.147  0.940  1.0
  O  O20  1  0.066  0.480  0.272  1.0
  O  O21  1  0.814  0.399  0.606  1.0
  O  O22  1  0.147  0.731  0.940  1.0
  O  O23  1  0.480  0.066  0.272  1.0
  O  O24  1  0.007  0.007  0.301  1.0
  O  O25  1  0.342  0.342  0.634  1.0
  O  O26  1  0.675  0.675  0.968  1.0
  O  O27  1  0.870  0.870  0.577  1.0
  O  O28  1  0.204  0.204  0.910  1.0
  O  O29  1  0.537  0.537  0.243  1.0
  O  O30  1  0.601  0.186  0.394  1.0
  O  O31  1  0.934  0.520  0.728  1.0
  O  O32  1  0.269  0.853  0.060  1.0
  O  O33  1  0.186  0.601  0.394  1.0
  O  O34  1  0.520  0.934  0.728  1.0
  O  O35  1  0.853  0.269  0.060  1.0
  O  O36  1  0.993  0.993  0.699  1.0
  O  O37  1  0.325  0.325  0.032  1.0
  O  O38  1  0.658  0.658  0.366  1.0
  O  O39  1  0.130  0.130  0.423  1.0
  O  O40  1  0.463  0.463  0.757  1.0
  O  O41  1  0.796  0.796  0.090  1.0
  O  O42  1  0.982  0.350  0.167  1.0
  O  O43  1  0.650  0.018  0.833  1.0
  O  O44  1  0.317  0.683  0.500  1.0
  O  O45  1  0.350  0.982  0.167  1.0
  O  O46  1  0.018  0.650  0.833  1.0
  O  O47  1  0.683  0.317  0.500  1.0
  O  O48  1  0.893  0.893  0.212  1.0
  O  O49  1  0.562  0.562  0.875  1.0
  O  O50  1  0.231  0.231  0.540  1.0
  O  O51  1  0.769  0.769  0.460  1.0
  O  O52  1  0.438  0.438  0.125  1.0
  O  O53  1  0.107  0.107  0.788  1.0
[/CIF]
.