The crystal structure described by Mg2Y3Si3O13 crystallizes in the hexagonal P6_3/m space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(3) atoms. Y(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), and four equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(3), and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Mg(1), one Y(1), and one Si(1) atom. In the second O site, O(4) is bonded in a trigonal planar geometry to three equivalent Y(1) atoms. In the third O site, O(1) is bonded to two equivalent Mg(1), one Y(1), and one Si(1) atom to form distorted edge-sharing OYMg2Si tetrahedra. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Y(1) and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y3Mg2Si3O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.455
_cell_length_b   9.455
_cell_length_c   6.614
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   512.131
_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
  Y  Y0  1  0.754  0.759  0.750  1.0
  Y  Y1  1  0.246  0.241  0.250  1.0
  Y  Y2  1  0.005  0.246  0.750  1.0
  Y  Y3  1  0.995  0.754  0.250  1.0
  Y  Y4  1  0.241  0.995  0.750  1.0
  Y  Y5  1  0.759  0.005  0.250  1.0
  Mg  Mg6  1  0.333  0.667  0.017  1.0
  Mg  Mg7  1  0.667  0.333  0.983  1.0
  Mg  Mg8  1  0.667  0.333  0.517  1.0
  Mg  Mg9  1  0.333  0.667  0.483  1.0
  Si  Si10  1  0.598  0.975  0.750  1.0
  Si  Si11  1  0.402  0.025  0.250  1.0
  Si  Si12  1  0.377  0.402  0.750  1.0
  Si  Si13  1  0.623  0.598  0.250  1.0
  Si  Si14  1  0.025  0.623  0.750  1.0
  Si  Si15  1  0.975  0.377  0.250  1.0
  O  O16  1  0.398  0.865  0.750  1.0
  O  O17  1  0.602  0.135  0.250  1.0
  O  O18  1  0.467  0.602  0.750  1.0
  O  O19  1  0.533  0.398  0.250  1.0
  O  O20  1  0.135  0.533  0.750  1.0
  O  O21  1  0.865  0.467  0.250  1.0
  O  O22  1  0.669  0.917  0.940  1.0
  O  O23  1  0.331  0.083  0.060  1.0
  O  O24  1  0.247  0.331  0.940  1.0
  O  O25  1  0.331  0.083  0.440  1.0
  O  O26  1  0.753  0.669  0.060  1.0
  O  O27  1  0.669  0.917  0.560  1.0
  O  O28  1  0.083  0.753  0.940  1.0
  O  O29  1  0.753  0.669  0.440  1.0
  O  O30  1  0.917  0.247  0.060  1.0
  O  O31  1  0.247  0.331  0.560  1.0
  O  O32  1  0.917  0.247  0.440  1.0
  O  O33  1  0.083  0.753  0.560  1.0
  O  O34  1  0.828  0.498  0.750  1.0
  O  O35  1  0.172  0.502  0.250  1.0
  O  O36  1  0.670  0.172  0.750  1.0
  O  O37  1  0.330  0.828  0.250  1.0
  O  O38  1  0.502  0.330  0.750  1.0
  O  O39  1  0.498  0.670  0.250  1.0
  O  O40  1  0.000  0.000  0.750  1.0
  O  O41  1  0.000  0.000  0.250  1.0
[/CIF]
.
The crystal structure described by Mg2Y3Si3O13 crystallizes in the hexagonal P6_3/m space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(3) atoms. Y(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), and four equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1), one O(3), and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Mg(1), one Y(1), and one Si(1) atom. In the second O site, O(4) is bonded in a trigonal planar geometry to three equivalent Y(1) atoms. In the third O site, O(1) is bonded to two equivalent Mg(1), one Y(1), and one Si(1) atom to form distorted edge-sharing OYMg2Si tetrahedra. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Y(1) and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y3Mg2Si3O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.455
_cell_length_b   9.455
_cell_length_c   6.614
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   512.131
_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
  Y  Y0  1  0.754  0.759  0.750  1.0
  Y  Y1  1  0.246  0.241  0.250  1.0
  Y  Y2  1  0.005  0.246  0.750  1.0
  Y  Y3  1  0.995  0.754  0.250  1.0
  Y  Y4  1  0.241  0.995  0.750  1.0
  Y  Y5  1  0.759  0.005  0.250  1.0
  Mg  Mg6  1  0.333  0.667  0.017  1.0
  Mg  Mg7  1  0.667  0.333  0.983  1.0
  Mg  Mg8  1  0.667  0.333  0.517  1.0
  Mg  Mg9  1  0.333  0.667  0.483  1.0
  Si  Si10  1  0.598  0.975  0.750  1.0
  Si  Si11  1  0.402  0.025  0.250  1.0
  Si  Si12  1  0.377  0.402  0.750  1.0
  Si  Si13  1  0.623  0.598  0.250  1.0
  Si  Si14  1  0.025  0.623  0.750  1.0
  Si  Si15  1  0.975  0.377  0.250  1.0
  O  O16  1  0.398  0.865  0.750  1.0
  O  O17  1  0.602  0.135  0.250  1.0
  O  O18  1  0.467  0.602  0.750  1.0
  O  O19  1  0.533  0.398  0.250  1.0
  O  O20  1  0.135  0.533  0.750  1.0
  O  O21  1  0.865  0.467  0.250  1.0
  O  O22  1  0.669  0.917  0.940  1.0
  O  O23  1  0.331  0.083  0.060  1.0
  O  O24  1  0.247  0.331  0.940  1.0
  O  O25  1  0.331  0.083  0.440  1.0
  O  O26  1  0.753  0.669  0.060  1.0
  O  O27  1  0.669  0.917  0.560  1.0
  O  O28  1  0.083  0.753  0.940  1.0
  O  O29  1  0.753  0.669  0.440  1.0
  O  O30  1  0.917  0.247  0.060  1.0
  O  O31  1  0.247  0.331  0.560  1.0
  O  O32  1  0.917  0.247  0.440  1.0
  O  O33  1  0.083  0.753  0.560  1.0
  O  O34  1  0.828  0.498  0.750  1.0
  O  O35  1  0.172  0.502  0.250  1.0
  O  O36  1  0.670  0.172  0.750  1.0
  O  O37  1  0.330  0.828  0.250  1.0
  O  O38  1  0.502  0.330  0.750  1.0
  O  O39  1  0.498  0.670  0.250  1.0
  O  O40  1  0.000  0.000  0.750  1.0
  O  O41  1  0.000  0.000  0.250  1.0
[/CIF]
.