The material structure described by Mn5(Si2O7)2 crystallizes in the triclinic P1 space group. There are ten inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a square co-planar geometry to one O(17), one O(19), one O(26), and one O(28) atom. In the second Mn site, Mn(2) is bonded in a square co-planar geometry to one O(18), one O(20), one O(25), and one O(27) atom. In the third Mn site, Mn(3) is bonded to one O(13), one O(2), one O(23), one O(4), and one O(6) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  an edgeedge with one Mn(7)O6 pentagonal pyramid, and  an edgeedge with one Mn(5)O5 trigonal bipyramid. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(14), one O(24), one O(3), and one O(5) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, and  an edgeedge with one Mn(6)O5 trigonal bipyramid. In the fifth Mn site, Mn(5) is bonded to one O(15), one O(2), one O(21), one O(4), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. In the sixth Mn site, Mn(6) is bonded to one O(1), one O(16), one O(22), one O(3), and one O(7) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  an edgeedge with one Mn(10)O6 pentagonal pyramid, and  an edgeedge with one Mn(4)O5 trigonal bipyramid. In the seventh Mn site, Mn(7) is bonded to one O(13), one O(20), one O(21), one O(23), one O(27), and one O(5) atom to form distorted MnO6 pentagonal pyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid,  an edgeedge with one Si(5)O4 tetrahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. In the eighth Mn site, Mn(8) is bonded in a 6-coordinate geometry to one O(14), one O(19), one O(22), one O(24), one O(28), and one O(6) atom. In the ninth Mn site, Mn(9) is bonded in a 6-coordinate geometry to one O(15), one O(18), one O(21), one O(23), one O(25), and one O(7) atom. In the tenth Mn site, Mn(10) is bonded to one O(16), one O(17), one O(22), one O(24), one O(26), and one O(8) atom to form distorted MnO6 pentagonal pyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid,  an edgeedge with one Si(8)O4 tetrahedra, and  an edgeedge with one Mn(6)O5 trigonal bipyramid. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(11), one O(13), and one O(26) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid,  a cornercorner with one Mn(4)O5 trigonal bipyramid, and  a cornercorner with one Mn(6)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(12), one O(14), one O(2), and one O(25) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(8)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid,  a cornercorner with one Mn(4)O5 trigonal bipyramid, and  a cornercorner with one Mn(5)O5 trigonal bipyramid. In the third Si site, Si(3) is bonded to one O(15), one O(28), one O(3), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid, and  a cornercorner with one Mn(6)O5 trigonal bipyramid. In the fourth Si site, Si(4) is bonded to one O(10), one O(16), one O(27), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid, and  a cornercorner with one Mn(6)O5 trigonal bipyramid. In the fifth Si site, Si(5) is bonded to one O(17), one O(21), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid, and  an edgeedge with one Mn(7)O6 pentagonal pyramid. In the sixth Si site, Si(6) is bonded to one O(10), one O(18), one O(22), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid, and  a cornercorner with one Mn(6)O5 trigonal bipyramid. In the seventh Si site, Si(7) is bonded to one O(11), one O(19), one O(23), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid, and  a cornercorner with one Mn(6)O5 trigonal bipyramid. In the eighth Si site, Si(8) is bonded to one O(12), one O(20), one O(24), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid, and  an edgeedge with one Mn(10)O6 pentagonal pyramid. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(6), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(5), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(6), and one Si(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(5), and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Mn(4), one Mn(7), and one Si(5) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mn(3), one Mn(8), and one Si(6) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mn(6), one Mn(9), and one Si(7) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Mn(10), one Mn(5), and one Si(8) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Si(3) and one Si(5) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Si(4) and one Si(6) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(7) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Si(2) and one Si(8) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(7), and one Si(1) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(8), and one Si(2) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Mn(5), one Mn(9), and one Si(3) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Mn(10), one Mn(6), and one Si(4) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(10), and one Si(5) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(9), and one Si(6) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(8), and one Si(7) atom. In the twentieth O site, O(20) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(7), and one Si(8) atom. In the twenty-first O site, O(21) is bonded in a 4-coordinate geometry to one Mn(5), one Mn(7), one Mn(9), and one Si(5) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Mn(10), one Mn(6), one Mn(8), and one Si(6) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Mn(3), one Mn(7), one Mn(9), and one Si(7) atom. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one Mn(10), one Mn(4), one Mn(8), and one Si(8) atom. In the twenty-fifth O site, O(25) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(9), and one Si(2) atom. In the twenty-sixth O site, O(26) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(10), and one Si(1) atom. In the twenty-seventh O site, O(27) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(7), and one Si(4) atom. In the twenty-eighth O site, O(28) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(8), and one Si(3) atom. is represented by the CIF card [CIF]
data_Mn5(Si2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.813
_cell_length_b   8.971
_cell_length_c   9.580
_cell_angle_alpha   103.650
_cell_angle_beta   80.597
_cell_angle_gamma   75.950
_symmetry_Int_Tables_number   1
_cell_volume   615.393
_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
  Mn  Mn0  1  0.512  0.490  0.488  1.0
  Mn  Mn1  1  0.987  0.010  0.012  1.0
  Mn  Mn2  1  0.006  0.446  0.650  1.0
  Mn  Mn3  1  0.475  0.943  0.155  1.0
  Mn  Mn4  1  0.025  0.558  0.346  1.0
  Mn  Mn5  1  0.494  0.054  0.850  1.0
  Mn  Mn6  1  0.884  0.678  0.982  1.0
  Mn  Mn7  1  0.386  0.174  0.474  1.0
  Mn  Mn8  1  0.114  0.326  0.025  1.0
  Mn  Mn9  1  0.616  0.822  0.519  1.0
  Si  Si10  1  0.553  0.670  0.812  1.0
  Si  Si11  1  0.037  0.180  0.333  1.0
  Si  Si12  1  0.463  0.320  0.167  1.0
  Si  Si13  1  0.948  0.830  0.688  1.0
  Si  Si14  1  0.671  0.560  0.180  1.0
  Si  Si15  1  0.161  0.067  0.699  1.0
  Si  Si16  1  0.339  0.433  0.801  1.0
  Si  Si17  1  0.829  0.940  0.320  1.0
  O  O18  1  0.474  0.862  0.911  1.0
  O  O19  1  0.979  0.370  0.439  1.0
  O  O20  1  0.521  0.130  0.061  1.0
  O  O21  1  0.026  0.638  0.589  1.0
  O  O22  1  0.607  0.710  0.115  1.0
  O  O23  1  0.117  0.219  0.630  1.0
  O  O24  1  0.384  0.281  0.869  1.0
  O  O25  1  0.890  0.790  0.386  1.0
  O  O26  1  0.612  0.403  0.101  1.0
  O  O27  1  0.088  0.921  0.621  1.0
  O  O28  1  0.412  0.579  0.879  1.0
  O  O29  1  0.888  0.097  0.398  1.0
  O  O30  1  0.764  0.582  0.806  1.0
  O  O31  1  0.247  0.083  0.319  1.0
  O  O32  1  0.253  0.417  0.181  1.0
  O  O33  1  0.737  0.918  0.695  1.0
  O  O34  1  0.586  0.608  0.361  1.0
  O  O35  1  0.075  0.123  0.879  1.0
  O  O36  1  0.424  0.379  0.620  1.0
  O  O37  1  0.913  0.890  0.139  1.0
  O  O38  1  0.894  0.520  0.143  1.0
  O  O39  1  0.386  0.007  0.668  1.0
  O  O40  1  0.114  0.493  0.833  1.0
  O  O41  1  0.606  0.981  0.357  1.0
  O  O42  1  0.017  0.179  0.162  1.0
  O  O43  1  0.535  0.657  0.639  1.0
  O  O44  1  0.966  0.841  0.860  1.0
  O  O45  1  0.484  0.322  0.338  1.0
[/CIF]
.
The material structure described by Mn5(Si2O7)2 crystallizes in the triclinic P1 space group. There are ten inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a square co-planar geometry to one O(17), one O(19), one O(26), and one O(28) atom. In the second Mn site, Mn(2) is bonded in a square co-planar geometry to one O(18), one O(20), one O(25), and one O(27) atom. In the third Mn site, Mn(3) is bonded to one O(13), one O(2), one O(23), one O(4), and one O(6) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  an edgeedge with one Mn(7)O6 pentagonal pyramid, and  an edgeedge with one Mn(5)O5 trigonal bipyramid. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(14), one O(24), one O(3), and one O(5) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, and  an edgeedge with one Mn(6)O5 trigonal bipyramid. In the fifth Mn site, Mn(5) is bonded to one O(15), one O(2), one O(21), one O(4), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. In the sixth Mn site, Mn(6) is bonded to one O(1), one O(16), one O(22), one O(3), and one O(7) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  an edgeedge with one Mn(10)O6 pentagonal pyramid, and  an edgeedge with one Mn(4)O5 trigonal bipyramid. In the seventh Mn site, Mn(7) is bonded to one O(13), one O(20), one O(21), one O(23), one O(27), and one O(5) atom to form distorted MnO6 pentagonal pyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid,  an edgeedge with one Si(5)O4 tetrahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. In the eighth Mn site, Mn(8) is bonded in a 6-coordinate geometry to one O(14), one O(19), one O(22), one O(24), one O(28), and one O(6) atom. In the ninth Mn site, Mn(9) is bonded in a 6-coordinate geometry to one O(15), one O(18), one O(21), one O(23), one O(25), and one O(7) atom. In the tenth Mn site, Mn(10) is bonded to one O(16), one O(17), one O(22), one O(24), one O(26), and one O(8) atom to form distorted MnO6 pentagonal pyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid,  an edgeedge with one Si(8)O4 tetrahedra, and  an edgeedge with one Mn(6)O5 trigonal bipyramid. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(11), one O(13), and one O(26) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid,  a cornercorner with one Mn(4)O5 trigonal bipyramid, and  a cornercorner with one Mn(6)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(12), one O(14), one O(2), and one O(25) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(8)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid,  a cornercorner with one Mn(4)O5 trigonal bipyramid, and  a cornercorner with one Mn(5)O5 trigonal bipyramid. In the third Si site, Si(3) is bonded to one O(15), one O(28), one O(3), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid, and  a cornercorner with one Mn(6)O5 trigonal bipyramid. In the fourth Si site, Si(4) is bonded to one O(10), one O(16), one O(27), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid, and  a cornercorner with one Mn(6)O5 trigonal bipyramid. In the fifth Si site, Si(5) is bonded to one O(17), one O(21), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid, and  an edgeedge with one Mn(7)O6 pentagonal pyramid. In the sixth Si site, Si(6) is bonded to one O(10), one O(18), one O(22), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(10)O6 pentagonal pyramid,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid, and  a cornercorner with one Mn(6)O5 trigonal bipyramid. In the seventh Si site, Si(7) is bonded to one O(11), one O(19), one O(23), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid, and  a cornercorner with one Mn(6)O5 trigonal bipyramid. In the eighth Si site, Si(8) is bonded to one O(12), one O(20), one O(24), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(7)O6 pentagonal pyramid,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Mn(4)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid, and  an edgeedge with one Mn(10)O6 pentagonal pyramid. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(6), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(5), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(6), and one Si(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(5), and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Mn(4), one Mn(7), and one Si(5) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mn(3), one Mn(8), and one Si(6) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mn(6), one Mn(9), and one Si(7) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Mn(10), one Mn(5), and one Si(8) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Si(3) and one Si(5) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Si(4) and one Si(6) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(7) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Si(2) and one Si(8) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(7), and one Si(1) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(8), and one Si(2) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Mn(5), one Mn(9), and one Si(3) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Mn(10), one Mn(6), and one Si(4) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(10), and one Si(5) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(9), and one Si(6) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(8), and one Si(7) atom. In the twentieth O site, O(20) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(7), and one Si(8) atom. In the twenty-first O site, O(21) is bonded in a 4-coordinate geometry to one Mn(5), one Mn(7), one Mn(9), and one Si(5) atom. In the twenty-second O site, O(22) is bonded in a 4-coordinate geometry to one Mn(10), one Mn(6), one Mn(8), and one Si(6) atom. In the twenty-third O site, O(23) is bonded in a 4-coordinate geometry to one Mn(3), one Mn(7), one Mn(9), and one Si(7) atom. In the twenty-fourth O site, O(24) is bonded in a 4-coordinate geometry to one Mn(10), one Mn(4), one Mn(8), and one Si(8) atom. In the twenty-fifth O site, O(25) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(9), and one Si(2) atom. In the twenty-sixth O site, O(26) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(10), and one Si(1) atom. In the twenty-seventh O site, O(27) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(7), and one Si(4) atom. In the twenty-eighth O site, O(28) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(8), and one Si(3) atom. is represented by the CIF card [CIF]
data_Mn5(Si2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.813
_cell_length_b   8.971
_cell_length_c   9.580
_cell_angle_alpha   103.650
_cell_angle_beta   80.597
_cell_angle_gamma   75.950
_symmetry_Int_Tables_number   1
_cell_volume   615.393
_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
  Mn  Mn0  1  0.512  0.490  0.488  1.0
  Mn  Mn1  1  0.987  0.010  0.012  1.0
  Mn  Mn2  1  0.006  0.446  0.650  1.0
  Mn  Mn3  1  0.475  0.943  0.155  1.0
  Mn  Mn4  1  0.025  0.558  0.346  1.0
  Mn  Mn5  1  0.494  0.054  0.850  1.0
  Mn  Mn6  1  0.884  0.678  0.982  1.0
  Mn  Mn7  1  0.386  0.174  0.474  1.0
  Mn  Mn8  1  0.114  0.326  0.025  1.0
  Mn  Mn9  1  0.616  0.822  0.519  1.0
  Si  Si10  1  0.553  0.670  0.812  1.0
  Si  Si11  1  0.037  0.180  0.333  1.0
  Si  Si12  1  0.463  0.320  0.167  1.0
  Si  Si13  1  0.948  0.830  0.688  1.0
  Si  Si14  1  0.671  0.560  0.180  1.0
  Si  Si15  1  0.161  0.067  0.699  1.0
  Si  Si16  1  0.339  0.433  0.801  1.0
  Si  Si17  1  0.829  0.940  0.320  1.0
  O  O18  1  0.474  0.862  0.911  1.0
  O  O19  1  0.979  0.370  0.439  1.0
  O  O20  1  0.521  0.130  0.061  1.0
  O  O21  1  0.026  0.638  0.589  1.0
  O  O22  1  0.607  0.710  0.115  1.0
  O  O23  1  0.117  0.219  0.630  1.0
  O  O24  1  0.384  0.281  0.869  1.0
  O  O25  1  0.890  0.790  0.386  1.0
  O  O26  1  0.612  0.403  0.101  1.0
  O  O27  1  0.088  0.921  0.621  1.0
  O  O28  1  0.412  0.579  0.879  1.0
  O  O29  1  0.888  0.097  0.398  1.0
  O  O30  1  0.764  0.582  0.806  1.0
  O  O31  1  0.247  0.083  0.319  1.0
  O  O32  1  0.253  0.417  0.181  1.0
  O  O33  1  0.737  0.918  0.695  1.0
  O  O34  1  0.586  0.608  0.361  1.0
  O  O35  1  0.075  0.123  0.879  1.0
  O  O36  1  0.424  0.379  0.620  1.0
  O  O37  1  0.913  0.890  0.139  1.0
  O  O38  1  0.894  0.520  0.143  1.0
  O  O39  1  0.386  0.007  0.668  1.0
  O  O40  1  0.114  0.493  0.833  1.0
  O  O41  1  0.606  0.981  0.357  1.0
  O  O42  1  0.017  0.179  0.162  1.0
  O  O43  1  0.535  0.657  0.639  1.0
  O  O44  1  0.966  0.841  0.860  1.0
  O  O45  1  0.484  0.322  0.338  1.0
[/CIF]
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