The crystal structure described by Mn2Si4O11 crystallizes in the triclinic P-1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 6-coordinate geometry to one O(1), one O(7), one O(8), one O(9), and two equivalent O(11) atoms. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(11), one O(3), one O(7), one O(8), and one O(9) atom. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(6), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(1) and one Si(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mn(2) and one Si(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Si(3) and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(4) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Si(2) and one Si(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Mn(2), two equivalent Mn(1), and one Si(2) atom. is represented by the CIF file [CIF]
data_Mn2Si4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.092
_cell_length_b   7.477
_cell_length_c   8.325
_cell_angle_alpha   97.457
_cell_angle_beta   104.033
_cell_angle_gamma   110.325
_symmetry_Int_Tables_number   1
_cell_volume   390.353
_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  0.135  0.373  0.608  1.0
  Mn  Mn1  1  0.646  0.375  0.609  1.0
  Mn  Mn2  1  0.354  0.625  0.391  1.0
  Mn  Mn3  1  0.865  0.627  0.392  1.0
  Si  Si4  1  0.772  0.624  0.980  1.0
  Si  Si5  1  0.058  0.800  0.788  1.0
  Si  Si6  1  0.487  0.797  0.794  1.0
  Si  Si7  1  0.219  0.016  0.391  1.0
  Si  Si8  1  0.781  0.984  0.609  1.0
  Si  Si9  1  0.513  0.203  0.206  1.0
  Si  Si10  1  0.942  0.200  0.212  1.0
  Si  Si11  1  0.228  0.376  0.020  1.0
  O  O12  1  0.193  0.424  0.836  1.0
  O  O13  1  0.619  0.744  0.952  1.0
  O  O14  1  0.679  0.423  0.833  1.0
  O  O15  1  0.991  0.768  0.956  1.0
  O  O16  1  0.306  0.857  0.837  1.0
  O  O17  1  0.632  0.976  0.730  1.0
  O  O18  1  0.386  0.606  0.628  1.0
  O  O19  1  0.346  0.210  0.549  1.0
  O  O20  1  0.845  0.197  0.563  1.0
  O  O21  1  0.001  0.971  0.712  1.0
  O  O22  1  0.920  0.599  0.631  1.0
  O  O23  1  0.080  0.401  0.369  1.0
  O  O24  1  0.999  0.029  0.288  1.0
  O  O25  1  0.155  0.803  0.437  1.0
  O  O26  1  0.654  0.790  0.451  1.0
  O  O27  1  0.614  0.394  0.372  1.0
  O  O28  1  0.368  0.024  0.270  1.0
  O  O29  1  0.694  0.143  0.163  1.0
  O  O30  1  0.009  0.232  0.044  1.0
  O  O31  1  0.321  0.577  0.167  1.0
  O  O32  1  0.381  0.256  0.048  1.0
  O  O33  1  0.807  0.576  0.164  1.0
[/CIF]
.
The crystal structure described by Mn2Si4O11 crystallizes in the triclinic P-1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 6-coordinate geometry to one O(1), one O(7), one O(8), one O(9), and two equivalent O(11) atoms. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(11), one O(3), one O(7), one O(8), and one O(9) atom. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(6), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(1) and one Si(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mn(2) and one Si(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Si(3) and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(4) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Si(2) and one Si(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Mn(2), two equivalent Mn(1), and one Si(2) atom. is represented by the CIF file [CIF]
data_Mn2Si4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.092
_cell_length_b   7.477
_cell_length_c   8.325
_cell_angle_alpha   97.457
_cell_angle_beta   104.033
_cell_angle_gamma   110.325
_symmetry_Int_Tables_number   1
_cell_volume   390.353
_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  0.135  0.373  0.608  1.0
  Mn  Mn1  1  0.646  0.375  0.609  1.0
  Mn  Mn2  1  0.354  0.625  0.391  1.0
  Mn  Mn3  1  0.865  0.627  0.392  1.0
  Si  Si4  1  0.772  0.624  0.980  1.0
  Si  Si5  1  0.058  0.800  0.788  1.0
  Si  Si6  1  0.487  0.797  0.794  1.0
  Si  Si7  1  0.219  0.016  0.391  1.0
  Si  Si8  1  0.781  0.984  0.609  1.0
  Si  Si9  1  0.513  0.203  0.206  1.0
  Si  Si10  1  0.942  0.200  0.212  1.0
  Si  Si11  1  0.228  0.376  0.020  1.0
  O  O12  1  0.193  0.424  0.836  1.0
  O  O13  1  0.619  0.744  0.952  1.0
  O  O14  1  0.679  0.423  0.833  1.0
  O  O15  1  0.991  0.768  0.956  1.0
  O  O16  1  0.306  0.857  0.837  1.0
  O  O17  1  0.632  0.976  0.730  1.0
  O  O18  1  0.386  0.606  0.628  1.0
  O  O19  1  0.346  0.210  0.549  1.0
  O  O20  1  0.845  0.197  0.563  1.0
  O  O21  1  0.001  0.971  0.712  1.0
  O  O22  1  0.920  0.599  0.631  1.0
  O  O23  1  0.080  0.401  0.369  1.0
  O  O24  1  0.999  0.029  0.288  1.0
  O  O25  1  0.155  0.803  0.437  1.0
  O  O26  1  0.654  0.790  0.451  1.0
  O  O27  1  0.614  0.394  0.372  1.0
  O  O28  1  0.368  0.024  0.270  1.0
  O  O29  1  0.694  0.143  0.163  1.0
  O  O30  1  0.009  0.232  0.044  1.0
  O  O31  1  0.321  0.577  0.167  1.0
  O  O32  1  0.381  0.256  0.048  1.0
  O  O33  1  0.807  0.576  0.164  1.0
[/CIF]
.