The crystal structure described by Lu2SiO5 crystallizes in the monoclinic C2/c space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(2) atoms to form distorted LuO6 octahedra that share corners with four equivalent Si(1)O4 tetrahedra and edges with two equivalent Lu(1)O6 octahedra. In the second Lu site, Lu(2) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms. Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with four equivalent Lu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-68°. There are five inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to one Lu(1), one Lu(2), and one Si(1) atom. In the second O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Lu(2) and one Si(1) atom. In the third O site, O(5) is bonded in a 4-coordinate geometry to one Lu(1), two equivalent Lu(2), and one Si(1) atom. In the fourth O site, O(1) is bonded to two equivalent Lu(1) and two equivalent Lu(2) atoms to form edge-sharing OLu4 tetrahedra. In the fifth O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Lu(1) and one Si(1) atom. is represented by the CIF card [CIF]
data_Lu2SiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.812
_cell_length_b   7.812
_cell_length_c   10.132
_cell_angle_alpha   61.215
_cell_angle_beta   61.215
_cell_angle_gamma   49.881
_symmetry_Int_Tables_number   1
_cell_volume   400.687
_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
  Lu  Lu0  1  0.517  0.763  0.663  1.0
  Lu  Lu1  1  0.237  0.483  0.837  1.0
  Lu  Lu2  1  0.483  0.237  0.337  1.0
  Lu  Lu3  1  0.763  0.517  0.163  1.0
  Lu  Lu4  1  0.294  0.781  0.032  1.0
  Lu  Lu5  1  0.219  0.706  0.468  1.0
  Lu  Lu6  1  0.706  0.219  0.968  1.0
  Lu  Lu7  1  0.781  0.294  0.532  1.0
  Si  Si8  1  0.910  0.724  0.307  1.0
  Si  Si9  1  0.276  0.090  0.193  1.0
  Si  Si10  1  0.090  0.276  0.693  1.0
  Si  Si11  1  0.724  0.910  0.807  1.0
  O  O12  1  0.420  0.615  0.603  1.0
  O  O13  1  0.385  0.580  0.897  1.0
  O  O14  1  0.580  0.385  0.397  1.0
  O  O15  1  0.615  0.420  0.103  1.0
  O  O16  1  0.725  0.870  0.438  1.0
  O  O17  1  0.130  0.275  0.062  1.0
  O  O18  1  0.275  0.130  0.562  1.0
  O  O19  1  0.870  0.725  0.938  1.0
  O  O20  1  0.851  0.550  0.323  1.0
  O  O21  1  0.450  0.149  0.177  1.0
  O  O22  1  0.149  0.450  0.677  1.0
  O  O23  1  0.550  0.851  0.823  1.0
  O  O24  1  0.903  0.920  0.636  1.0
  O  O25  1  0.080  0.097  0.864  1.0
  O  O26  1  0.097  0.080  0.364  1.0
  O  O27  1  0.920  0.903  0.136  1.0
  O  O28  1  0.589  0.171  0.826  1.0
  O  O29  1  0.829  0.411  0.674  1.0
  O  O30  1  0.411  0.829  0.174  1.0
  O  O31  1  0.171  0.589  0.326  1.0
[/CIF]
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The crystal structure described by Lu2SiO5 crystallizes in the monoclinic C2/c space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(2) atoms to form distorted LuO6 octahedra that share corners with four equivalent Si(1)O4 tetrahedra and edges with two equivalent Lu(1)O6 octahedra. In the second Lu site, Lu(2) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms. Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with four equivalent Lu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-68°. There are five inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to one Lu(1), one Lu(2), and one Si(1) atom. In the second O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Lu(2) and one Si(1) atom. In the third O site, O(5) is bonded in a 4-coordinate geometry to one Lu(1), two equivalent Lu(2), and one Si(1) atom. In the fourth O site, O(1) is bonded to two equivalent Lu(1) and two equivalent Lu(2) atoms to form edge-sharing OLu4 tetrahedra. In the fifth O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Lu(1) and one Si(1) atom. is represented by the CIF card [CIF]
data_Lu2SiO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.812
_cell_length_b   7.812
_cell_length_c   10.132
_cell_angle_alpha   61.215
_cell_angle_beta   61.215
_cell_angle_gamma   49.881
_symmetry_Int_Tables_number   1
_cell_volume   400.687
_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
  Lu  Lu0  1  0.517  0.763  0.663  1.0
  Lu  Lu1  1  0.237  0.483  0.837  1.0
  Lu  Lu2  1  0.483  0.237  0.337  1.0
  Lu  Lu3  1  0.763  0.517  0.163  1.0
  Lu  Lu4  1  0.294  0.781  0.032  1.0
  Lu  Lu5  1  0.219  0.706  0.468  1.0
  Lu  Lu6  1  0.706  0.219  0.968  1.0
  Lu  Lu7  1  0.781  0.294  0.532  1.0
  Si  Si8  1  0.910  0.724  0.307  1.0
  Si  Si9  1  0.276  0.090  0.193  1.0
  Si  Si10  1  0.090  0.276  0.693  1.0
  Si  Si11  1  0.724  0.910  0.807  1.0
  O  O12  1  0.420  0.615  0.603  1.0
  O  O13  1  0.385  0.580  0.897  1.0
  O  O14  1  0.580  0.385  0.397  1.0
  O  O15  1  0.615  0.420  0.103  1.0
  O  O16  1  0.725  0.870  0.438  1.0
  O  O17  1  0.130  0.275  0.062  1.0
  O  O18  1  0.275  0.130  0.562  1.0
  O  O19  1  0.870  0.725  0.938  1.0
  O  O20  1  0.851  0.550  0.323  1.0
  O  O21  1  0.450  0.149  0.177  1.0
  O  O22  1  0.149  0.450  0.677  1.0
  O  O23  1  0.550  0.851  0.823  1.0
  O  O24  1  0.903  0.920  0.636  1.0
  O  O25  1  0.080  0.097  0.864  1.0
  O  O26  1  0.097  0.080  0.364  1.0
  O  O27  1  0.920  0.903  0.136  1.0
  O  O28  1  0.589  0.171  0.826  1.0
  O  O29  1  0.829  0.411  0.674  1.0
  O  O30  1  0.411  0.829  0.174  1.0
  O  O31  1  0.171  0.589  0.326  1.0
[/CIF]
.