The material structure described by MgMn8(SiO3)10 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(18), one O(24), one O(26), one O(7), and one O(8) atom. There are eight inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(15), one O(16), one O(29), one O(3), and one O(30) atom. In the second Mn site, Mn(2) is bonded to one O(10), one O(13), one O(15), one O(17), one O(3), and one O(9) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(10)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(8)O4 tetrahedra,  an edgeedge with one Mn(5)O6 octahedra, and  an edgeedge with one Mn(7)O6 octahedra. In the third Mn site, Mn(3) is bonded in a 6-coordinate geometry to one O(11), one O(19), one O(20), one O(24), one O(26), and one O(29) atom. In the fourth Mn site, Mn(4) is bonded to one O(16), one O(21), one O(22), one O(30), one O(4), and one O(5) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, corners with two equivalent Si(5)O4 tetrahedra,  an edgeedge with one Mn(6)O6 octahedra, and  an edgeedge with one Si(6)O4 tetrahedra. In the fifth Mn site, Mn(5) is bonded to one O(13), one O(19), one O(2), one O(28), one O(29), and one O(3) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(7)O6 octahedra, and  an edgeedge with one Si(2)O4 tetrahedra. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(14), one O(16), one O(26), one O(5), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(9)O4 tetrahedra, corners with two equivalent Si(6)O4 tetrahedra,  an edgeedge with one Mn(4)O6 octahedra, and  an edgeedge with one Mn(7)O6 octahedra. In the seventh Mn site, Mn(7) is bonded to one O(13), one O(14), one O(17), one O(18), one O(2), and one O(8) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  a cornercorner with one Si(9)O4 tetrahedra, corners with two equivalent Si(10)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(5)O6 octahedra, and  an edgeedge with one Mn(6)O6 octahedra. In the eighth Mn site, Mn(8) is bonded in a 6-coordinate geometry to one O(14), one O(17), one O(22), one O(23), one O(5), and one O(9) atom. There are ten inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(27), one O(28), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra,  a cornercorner with one Si(10)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 17-69°. In the second Si site, Si(2) is bonded to one O(20), one O(28), one O(29), and one O(30) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, and  an edgeedge with one Mn(5)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. In the third Si site, Si(3) is bonded to one O(12), one O(15), one O(2), and one O(25) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-63°. In the fourth Si site, Si(4) is bonded to one O(1), one O(6), one O(8), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(6)O6 octahedra,  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Si(10)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-66°. In the fifth Si site, Si(5) is bonded to one O(12), one O(16), one O(19), and one O(21) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(6)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-61°. In the sixth Si site, Si(6) is bonded to one O(21), one O(23), one O(26), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Mn(6)O6 octahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(9)O4 tetrahedra, and  an edgeedge with one Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-69°. In the seventh Si site, Si(7) is bonded to one O(11), one O(20), one O(22), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Mn(6)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-67°. In the eighth Si site, Si(8) is bonded to one O(10), one O(13), one O(25), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(7)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(9)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-62°. In the ninth Si site, Si(9) is bonded to one O(14), one O(23), one O(24), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(6)O6 octahedra,  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Si(6)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-71°. In the tenth Si site, Si(10) is bonded to one O(1), one O(17), one O(18), and one O(27) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-67°. There are thirty inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Si(10) and one Si(4) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(5), one Mn(7), and one Si(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(2), one Mn(5), and one Si(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Mn(4) and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Mn(4), one Mn(6), one Mn(8), and one Si(6) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(7) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Mg(1), one Si(8), and one Si(9) atom. In the eighth O site, O(8) is bonded to one Mg(1), one Mn(6), one Mn(7), and one Si(4) atom to form distorted corner-sharing OMgMn2Si tetrahedra. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2), one Mn(8), and one Si(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Mn(2) and one Si(8) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(3), one Mn(6), and one Si(7) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Mn(1), one Si(3), and one Si(5) atom. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Mn(2), one Mn(5), one Mn(7), and one Si(8) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Mn(6), one Mn(7), one Mn(8), and one Si(9) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one Si(3) atom. In the sixteenth O site, O(16) is bonded to one Mn(1), one Mn(4), one Mn(6), and one Si(5) atom to form distorted corner-sharing OMn3Si tetrahedra. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Mn(2), one Mn(7), one Mn(8), and one Si(10) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mn(7), and one Si(10) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(5), and one Si(5) atom. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one Mn(3), one Si(2), and one Si(7) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one Mn(4), one Si(5), and one Si(6) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Mn(4), one Mn(8), and one Si(7) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one Mn(8), one Si(6), and one Si(9) atom. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mn(3), and one Si(9) atom. In the twenty-fifth O site, O(25) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(8) atom. In the twenty-sixth O site, O(26) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(3), one Mn(6), and one Si(6) atom. In the twenty-seventh O site, O(27) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(10) atom. In the twenty-eighth O site, O(28) is bonded in a 3-coordinate geometry to one Mn(5), one Si(1), and one Si(2) atom. In the twenty-ninth O site, O(29) is bonded in a distorted rectangular see-saw-like geometry to one Mn(1), one Mn(3), one Mn(5), and one Si(2) atom. In the thirtieth O site, O(30) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(4), and one Si(2) atom. is represented by the CIF file [CIF]
data_MgMn8(SiO3)10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.801
_cell_length_b   7.519
_cell_length_c   12.116
_cell_angle_alpha   106.484
_cell_angle_beta   94.212
_cell_angle_gamma   94.788
_symmetry_Int_Tables_number   1
_cell_volume   588.946
_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
  Mg  Mg0  1  0.668  0.031  0.698  1.0
  Mn  Mn1  1  0.033  0.109  0.165  1.0
  Mn  Mn2  1  0.123  0.325  0.449  1.0
  Mn  Mn3  1  0.771  0.271  0.971  1.0
  Mn  Mn4  1  0.261  0.741  0.037  1.0
  Mn  Mn5  1  0.809  0.487  0.263  1.0
  Mn  Mn6  1  0.977  0.882  0.856  1.0
  Mn  Mn7  1  0.865  0.687  0.547  1.0
  Mn  Mn8  1  0.184  0.509  0.737  1.0
  Si  Si9  1  0.293  0.541  0.258  1.0
  Si  Si10  1  0.489  0.200  0.124  1.0
  Si  Si11  1  0.835  0.936  0.346  1.0
  Si  Si12  1  0.147  0.081  0.659  1.0
  Si  Si13  1  0.783  0.734  0.081  1.0
  Si  Si14  1  0.519  0.779  0.870  1.0
  Si  Si15  1  0.239  0.273  0.922  1.0
  Si  Si16  1  0.620  0.264  0.467  1.0
  Si  Si17  1  0.706  0.444  0.734  1.0
  Si  Si18  1  0.361  0.737  0.524  1.0
  O  O19  1  0.290  0.948  0.577  1.0
  O  O20  1  0.877  0.754  0.388  1.0
  O  O21  1  0.099  0.401  0.266  1.0
  O  O22  1  0.257  0.659  0.168  1.0
  O  O23  1  0.283  0.805  0.879  1.0
  O  O24  1  0.279  0.168  0.787  1.0
  O  O25  1  0.634  0.291  0.609  1.0
  O  O26  1  0.951  0.957  0.679  1.0
  O  O27  1  0.103  0.255  0.610  1.0
  O  O28  1  0.404  0.309  0.428  1.0
  O  O29  1  0.052  0.166  0.962  1.0
  O  O30  1  0.748  0.867  0.209  1.0
  O  O31  1  0.813  0.396  0.442  1.0
  O  O32  1  0.894  0.596  0.737  1.0
  O  O33  1  0.030  0.083  0.345  1.0
  O  O34  1  0.967  0.829  0.030  1.0
  O  O35  1  0.187  0.590  0.553  1.0
  O  O36  1  0.581  0.765  0.591  1.0
  O  O37  1  0.805  0.530  0.092  1.0
  O  O38  1  0.442  0.251  0.999  1.0
  O  O39  1  0.582  0.743  0.996  1.0
  O  O40  1  0.209  0.487  0.924  1.0
  O  O41  1  0.516  0.571  0.772  1.0
  O  O42  1  0.739  0.299  0.808  1.0
  O  O43  1  0.666  0.046  0.417  1.0
  O  O44  1  0.663  0.941  0.845  1.0
  O  O45  1  0.367  0.688  0.385  1.0
  O  O46  1  0.474  0.404  0.223  1.0
  O  O47  1  0.726  0.184  0.131  1.0
  O  O48  1  0.329  0.030  0.129  1.0
[/CIF]
.
The material structure described by MgMn8(SiO3)10 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(18), one O(24), one O(26), one O(7), and one O(8) atom. There are eight inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(15), one O(16), one O(29), one O(3), and one O(30) atom. In the second Mn site, Mn(2) is bonded to one O(10), one O(13), one O(15), one O(17), one O(3), and one O(9) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(10)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(8)O4 tetrahedra,  an edgeedge with one Mn(5)O6 octahedra, and  an edgeedge with one Mn(7)O6 octahedra. In the third Mn site, Mn(3) is bonded in a 6-coordinate geometry to one O(11), one O(19), one O(20), one O(24), one O(26), and one O(29) atom. In the fourth Mn site, Mn(4) is bonded to one O(16), one O(21), one O(22), one O(30), one O(4), and one O(5) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, corners with two equivalent Si(5)O4 tetrahedra,  an edgeedge with one Mn(6)O6 octahedra, and  an edgeedge with one Si(6)O4 tetrahedra. In the fifth Mn site, Mn(5) is bonded to one O(13), one O(19), one O(2), one O(28), one O(29), and one O(3) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(7)O6 octahedra, and  an edgeedge with one Si(2)O4 tetrahedra. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(14), one O(16), one O(26), one O(5), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(9)O4 tetrahedra, corners with two equivalent Si(6)O4 tetrahedra,  an edgeedge with one Mn(4)O6 octahedra, and  an edgeedge with one Mn(7)O6 octahedra. In the seventh Mn site, Mn(7) is bonded to one O(13), one O(14), one O(17), one O(18), one O(2), and one O(8) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  a cornercorner with one Si(9)O4 tetrahedra, corners with two equivalent Si(10)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(5)O6 octahedra, and  an edgeedge with one Mn(6)O6 octahedra. In the eighth Mn site, Mn(8) is bonded in a 6-coordinate geometry to one O(14), one O(17), one O(22), one O(23), one O(5), and one O(9) atom. There are ten inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(27), one O(28), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra,  a cornercorner with one Si(10)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 17-69°. In the second Si site, Si(2) is bonded to one O(20), one O(28), one O(29), and one O(30) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, and  an edgeedge with one Mn(5)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. In the third Si site, Si(3) is bonded to one O(12), one O(15), one O(2), and one O(25) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-63°. In the fourth Si site, Si(4) is bonded to one O(1), one O(6), one O(8), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(6)O6 octahedra,  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Si(10)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-66°. In the fifth Si site, Si(5) is bonded to one O(12), one O(16), one O(19), and one O(21) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(6)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-61°. In the sixth Si site, Si(6) is bonded to one O(21), one O(23), one O(26), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Mn(6)O6 octahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(9)O4 tetrahedra, and  an edgeedge with one Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-69°. In the seventh Si site, Si(7) is bonded to one O(11), one O(20), one O(22), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Mn(6)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-67°. In the eighth Si site, Si(8) is bonded to one O(10), one O(13), one O(25), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(7)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(9)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-62°. In the ninth Si site, Si(9) is bonded to one O(14), one O(23), one O(24), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(6)O6 octahedra,  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Si(6)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-71°. In the tenth Si site, Si(10) is bonded to one O(1), one O(17), one O(18), and one O(27) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra, corners with two equivalent Mn(7)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-67°. There are thirty inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Si(10) and one Si(4) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(5), one Mn(7), and one Si(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(2), one Mn(5), and one Si(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Mn(4) and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Mn(4), one Mn(6), one Mn(8), and one Si(6) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(7) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Mg(1), one Si(8), and one Si(9) atom. In the eighth O site, O(8) is bonded to one Mg(1), one Mn(6), one Mn(7), and one Si(4) atom to form distorted corner-sharing OMgMn2Si tetrahedra. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2), one Mn(8), and one Si(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Mn(2) and one Si(8) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(3), one Mn(6), and one Si(7) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Mn(1), one Si(3), and one Si(5) atom. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Mn(2), one Mn(5), one Mn(7), and one Si(8) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Mn(6), one Mn(7), one Mn(8), and one Si(9) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one Si(3) atom. In the sixteenth O site, O(16) is bonded to one Mn(1), one Mn(4), one Mn(6), and one Si(5) atom to form distorted corner-sharing OMn3Si tetrahedra. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Mn(2), one Mn(7), one Mn(8), and one Si(10) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mn(7), and one Si(10) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(5), and one Si(5) atom. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one Mn(3), one Si(2), and one Si(7) atom. In the twenty-first O site, O(21) is bonded in a 3-coordinate geometry to one Mn(4), one Si(5), and one Si(6) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Mn(4), one Mn(8), and one Si(7) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one Mn(8), one Si(6), and one Si(9) atom. In the twenty-fourth O site, O(24) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Mn(3), and one Si(9) atom. In the twenty-fifth O site, O(25) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(8) atom. In the twenty-sixth O site, O(26) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(3), one Mn(6), and one Si(6) atom. In the twenty-seventh O site, O(27) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(10) atom. In the twenty-eighth O site, O(28) is bonded in a 3-coordinate geometry to one Mn(5), one Si(1), and one Si(2) atom. In the twenty-ninth O site, O(29) is bonded in a distorted rectangular see-saw-like geometry to one Mn(1), one Mn(3), one Mn(5), and one Si(2) atom. In the thirtieth O site, O(30) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(4), and one Si(2) atom. is represented by the CIF file [CIF]
data_MgMn8(SiO3)10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.801
_cell_length_b   7.519
_cell_length_c   12.116
_cell_angle_alpha   106.484
_cell_angle_beta   94.212
_cell_angle_gamma   94.788
_symmetry_Int_Tables_number   1
_cell_volume   588.946
_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
  Mg  Mg0  1  0.668  0.031  0.698  1.0
  Mn  Mn1  1  0.033  0.109  0.165  1.0
  Mn  Mn2  1  0.123  0.325  0.449  1.0
  Mn  Mn3  1  0.771  0.271  0.971  1.0
  Mn  Mn4  1  0.261  0.741  0.037  1.0
  Mn  Mn5  1  0.809  0.487  0.263  1.0
  Mn  Mn6  1  0.977  0.882  0.856  1.0
  Mn  Mn7  1  0.865  0.687  0.547  1.0
  Mn  Mn8  1  0.184  0.509  0.737  1.0
  Si  Si9  1  0.293  0.541  0.258  1.0
  Si  Si10  1  0.489  0.200  0.124  1.0
  Si  Si11  1  0.835  0.936  0.346  1.0
  Si  Si12  1  0.147  0.081  0.659  1.0
  Si  Si13  1  0.783  0.734  0.081  1.0
  Si  Si14  1  0.519  0.779  0.870  1.0
  Si  Si15  1  0.239  0.273  0.922  1.0
  Si  Si16  1  0.620  0.264  0.467  1.0
  Si  Si17  1  0.706  0.444  0.734  1.0
  Si  Si18  1  0.361  0.737  0.524  1.0
  O  O19  1  0.290  0.948  0.577  1.0
  O  O20  1  0.877  0.754  0.388  1.0
  O  O21  1  0.099  0.401  0.266  1.0
  O  O22  1  0.257  0.659  0.168  1.0
  O  O23  1  0.283  0.805  0.879  1.0
  O  O24  1  0.279  0.168  0.787  1.0
  O  O25  1  0.634  0.291  0.609  1.0
  O  O26  1  0.951  0.957  0.679  1.0
  O  O27  1  0.103  0.255  0.610  1.0
  O  O28  1  0.404  0.309  0.428  1.0
  O  O29  1  0.052  0.166  0.962  1.0
  O  O30  1  0.748  0.867  0.209  1.0
  O  O31  1  0.813  0.396  0.442  1.0
  O  O32  1  0.894  0.596  0.737  1.0
  O  O33  1  0.030  0.083  0.345  1.0
  O  O34  1  0.967  0.829  0.030  1.0
  O  O35  1  0.187  0.590  0.553  1.0
  O  O36  1  0.581  0.765  0.591  1.0
  O  O37  1  0.805  0.530  0.092  1.0
  O  O38  1  0.442  0.251  0.999  1.0
  O  O39  1  0.582  0.743  0.996  1.0
  O  O40  1  0.209  0.487  0.924  1.0
  O  O41  1  0.516  0.571  0.772  1.0
  O  O42  1  0.739  0.299  0.808  1.0
  O  O43  1  0.666  0.046  0.417  1.0
  O  O44  1  0.663  0.941  0.845  1.0
  O  O45  1  0.367  0.688  0.385  1.0
  O  O46  1  0.474  0.404  0.223  1.0
  O  O47  1  0.726  0.184  0.131  1.0
  O  O48  1  0.329  0.030  0.129  1.0
[/CIF]
.