The material structure described by Nd2SiO5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to one O(1), three equivalent O(2), and three equivalent O(3) atoms to form distorted NdO7 hexagonal pyramids that share corners with two equivalent Si(1)O4 tetrahedra, edges with six equivalent Nd(1)O7 hexagonal pyramids, and  an edgeedge with one Si(1)O4 tetrahedra. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), three equivalent O(4), and three equivalent O(5) atoms. Si(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Nd(1)O7 hexagonal pyramids and  an edgeedge with one Nd(1)O7 hexagonal pyramid. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Nd(1), two equivalent Nd(2), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Nd(1) and one Si(1) atom. In the third O site, O(3) is bonded to one Nd(2) and three equivalent Nd(1) atoms to form a mixture of corner and edge-sharing ONd4 tetrahedra. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to three equivalent Nd(2) and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to three equivalent Nd(2) and one Si(1) atom. is represented by the CIF card [CIF]
data_Nd2SiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.325
_cell_length_b   6.882
_cell_length_c   9.250
_cell_angle_alpha   71.702
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   442.750
_cell_formula_units_Z   4
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
  Nd  Nd0  1  0.625  0.234  0.979  1.0
  Nd  Nd1  1  0.125  0.266  0.021  1.0
  Nd  Nd2  1  0.653  0.093  0.610  1.0
  Nd  Nd3  1  0.847  0.593  0.610  1.0
  Nd  Nd4  1  0.153  0.407  0.390  1.0
  Nd  Nd5  1  0.347  0.907  0.390  1.0
  Nd  Nd6  1  0.875  0.734  0.979  1.0
  Nd  Nd7  1  0.375  0.766  0.021  1.0
  Si  Si8  1  0.081  0.044  0.701  1.0
  Si  Si9  1  0.581  0.456  0.299  1.0
  Si  Si10  1  0.419  0.544  0.701  1.0
  Si  Si11  1  0.919  0.956  0.299  1.0
  O  O12  1  0.571  0.365  0.706  1.0
  O  O13  1  0.365  0.494  0.882  1.0
  O  O14  1  0.377  0.047  0.116  1.0
  O  O15  1  0.865  0.006  0.118  1.0
  O  O16  1  0.254  0.057  0.592  1.0
  O  O17  1  0.746  0.943  0.408  1.0
  O  O18  1  0.039  0.748  0.366  1.0
  O  O19  1  0.135  0.994  0.882  1.0
  O  O20  1  0.461  0.248  0.366  1.0
  O  O21  1  0.623  0.953  0.884  1.0
  O  O22  1  0.071  0.135  0.294  1.0
  O  O23  1  0.123  0.547  0.116  1.0
  O  O24  1  0.754  0.443  0.408  1.0
  O  O25  1  0.539  0.752  0.634  1.0
  O  O26  1  0.961  0.252  0.634  1.0
  O  O27  1  0.929  0.865  0.706  1.0
  O  O28  1  0.635  0.506  0.118  1.0
  O  O29  1  0.877  0.453  0.884  1.0
  O  O30  1  0.429  0.635  0.294  1.0
  O  O31  1  0.246  0.557  0.592  1.0
[/CIF]
.
The material structure described by Nd2SiO5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to one O(1), three equivalent O(2), and three equivalent O(3) atoms to form distorted NdO7 hexagonal pyramids that share corners with two equivalent Si(1)O4 tetrahedra, edges with six equivalent Nd(1)O7 hexagonal pyramids, and  an edgeedge with one Si(1)O4 tetrahedra. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), three equivalent O(4), and three equivalent O(5) atoms. Si(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Nd(1)O7 hexagonal pyramids and  an edgeedge with one Nd(1)O7 hexagonal pyramid. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Nd(1), two equivalent Nd(2), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Nd(1) and one Si(1) atom. In the third O site, O(3) is bonded to one Nd(2) and three equivalent Nd(1) atoms to form a mixture of corner and edge-sharing ONd4 tetrahedra. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to three equivalent Nd(2) and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to three equivalent Nd(2) and one Si(1) atom. is represented by the CIF card [CIF]
data_Nd2SiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.325
_cell_length_b   6.882
_cell_length_c   9.250
_cell_angle_alpha   71.702
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   442.750
_cell_formula_units_Z   4
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
  Nd  Nd0  1  0.625  0.234  0.979  1.0
  Nd  Nd1  1  0.125  0.266  0.021  1.0
  Nd  Nd2  1  0.653  0.093  0.610  1.0
  Nd  Nd3  1  0.847  0.593  0.610  1.0
  Nd  Nd4  1  0.153  0.407  0.390  1.0
  Nd  Nd5  1  0.347  0.907  0.390  1.0
  Nd  Nd6  1  0.875  0.734  0.979  1.0
  Nd  Nd7  1  0.375  0.766  0.021  1.0
  Si  Si8  1  0.081  0.044  0.701  1.0
  Si  Si9  1  0.581  0.456  0.299  1.0
  Si  Si10  1  0.419  0.544  0.701  1.0
  Si  Si11  1  0.919  0.956  0.299  1.0
  O  O12  1  0.571  0.365  0.706  1.0
  O  O13  1  0.365  0.494  0.882  1.0
  O  O14  1  0.377  0.047  0.116  1.0
  O  O15  1  0.865  0.006  0.118  1.0
  O  O16  1  0.254  0.057  0.592  1.0
  O  O17  1  0.746  0.943  0.408  1.0
  O  O18  1  0.039  0.748  0.366  1.0
  O  O19  1  0.135  0.994  0.882  1.0
  O  O20  1  0.461  0.248  0.366  1.0
  O  O21  1  0.623  0.953  0.884  1.0
  O  O22  1  0.071  0.135  0.294  1.0
  O  O23  1  0.123  0.547  0.116  1.0
  O  O24  1  0.754  0.443  0.408  1.0
  O  O25  1  0.539  0.752  0.634  1.0
  O  O26  1  0.961  0.252  0.634  1.0
  O  O27  1  0.929  0.865  0.706  1.0
  O  O28  1  0.635  0.506  0.118  1.0
  O  O29  1  0.877  0.453  0.884  1.0
  O  O30  1  0.429  0.635  0.294  1.0
  O  O31  1  0.246  0.557  0.592  1.0
[/CIF]
.