The crystal structure described by K2BeSi4O13 crystallizes in the orthorhombic C222_1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(6), two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(6), and two equivalent O(7) atoms. Be(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form BeO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, 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  a cornercorner with one Be(1)O4 tetrahedra and corners with three equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(2) is bonded in a bent 120 degrees geometry to one Be(1) and one Si(1) atom. In the second O site, O(3) is bonded in a distorted bent 150 degrees geometry to one K(2), one Si(1), and one Si(2) atom. In the third O site, O(4) is bonded in a distorted bent 150 degrees geometry to one K(1), one Si(1), and one Si(2) atom. In the fourth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(1), one Si(1), and one Si(2) atom. In the fifth O site, O(6) is bonded in a distorted T-shaped geometry to one K(1) and two equivalent K(2) atoms. In the sixth O site, O(7) is bonded in a bent 120 degrees geometry to one K(1) and one K(2) atom. In the seventh O site, O(1) is bonded in a bent 120 degrees geometry to one Be(1) and one Si(2) atom. is represented by the CIF file [CIF]
data_K2BeSi4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.865
_cell_length_b   7.865
_cell_length_c   9.963
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   103.460
_symmetry_Int_Tables_number   1
_cell_volume   599.395
_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
  K  K0  1  0.708  0.292  0.250  1.0
  K  K1  1  0.292  0.708  0.750  1.0
  K  K2  1  0.140  0.140  0.000  1.0
  K  K3  1  0.860  0.860  0.500  1.0
  Be  Be4  1  0.726  0.726  0.000  1.0
  Be  Be5  1  0.274  0.274  0.500  1.0
  Si  Si6  1  0.451  0.864  0.122  1.0
  Si  Si7  1  0.864  0.451  0.878  1.0
  Si  Si8  1  0.549  0.136  0.622  1.0
  Si  Si9  1  0.136  0.549  0.378  1.0
  Si  Si10  1  0.668  0.061  0.907  1.0
  Si  Si11  1  0.061  0.668  0.093  1.0
  Si  Si12  1  0.332  0.939  0.407  1.0
  Si  Si13  1  0.939  0.332  0.593  1.0
  O  O14  1  0.755  0.896  0.897  1.0
  O  O15  1  0.896  0.755  0.103  1.0
  O  O16  1  0.245  0.104  0.397  1.0
  O  O17  1  0.104  0.245  0.603  1.0
  O  O18  1  0.548  0.712  0.087  1.0
  O  O19  1  0.712  0.548  0.913  1.0
  O  O20  1  0.452  0.288  0.587  1.0
  O  O21  1  0.288  0.452  0.413  1.0
  O  O22  1  0.818  0.243  0.925  1.0
  O  O23  1  0.243  0.818  0.075  1.0
  O  O24  1  0.182  0.757  0.425  1.0
  O  O25  1  0.757  0.182  0.575  1.0
  O  O26  1  0.460  0.924  0.280  1.0
  O  O27  1  0.924  0.460  0.720  1.0
  O  O28  1  0.540  0.076  0.780  1.0
  O  O29  1  0.076  0.540  0.220  1.0
  O  O30  1  0.539  0.047  0.040  1.0
  O  O31  1  0.047  0.539  0.960  1.0
  O  O32  1  0.461  0.953  0.540  1.0
  O  O33  1  0.953  0.461  0.460  1.0
  O  O34  1  0.948  0.052  0.250  1.0
  O  O35  1  0.052  0.948  0.750  1.0
  O  O36  1  0.402  0.360  0.161  1.0
  O  O37  1  0.360  0.402  0.839  1.0
  O  O38  1  0.598  0.640  0.661  1.0
  O  O39  1  0.640  0.598  0.339  1.0
[/CIF]
.
The crystal structure described by K2BeSi4O13 crystallizes in the orthorhombic C222_1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one O(6), two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(6), and two equivalent O(7) atoms. Be(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form BeO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, 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  a cornercorner with one Be(1)O4 tetrahedra and corners with three equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(2) is bonded in a bent 120 degrees geometry to one Be(1) and one Si(1) atom. In the second O site, O(3) is bonded in a distorted bent 150 degrees geometry to one K(2), one Si(1), and one Si(2) atom. In the third O site, O(4) is bonded in a distorted bent 150 degrees geometry to one K(1), one Si(1), and one Si(2) atom. In the fourth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(1), one Si(1), and one Si(2) atom. In the fifth O site, O(6) is bonded in a distorted T-shaped geometry to one K(1) and two equivalent K(2) atoms. In the sixth O site, O(7) is bonded in a bent 120 degrees geometry to one K(1) and one K(2) atom. In the seventh O site, O(1) is bonded in a bent 120 degrees geometry to one Be(1) and one Si(2) atom. is represented by the CIF file [CIF]
data_K2BeSi4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.865
_cell_length_b   7.865
_cell_length_c   9.963
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   103.460
_symmetry_Int_Tables_number   1
_cell_volume   599.395
_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
  K  K0  1  0.708  0.292  0.250  1.0
  K  K1  1  0.292  0.708  0.750  1.0
  K  K2  1  0.140  0.140  0.000  1.0
  K  K3  1  0.860  0.860  0.500  1.0
  Be  Be4  1  0.726  0.726  0.000  1.0
  Be  Be5  1  0.274  0.274  0.500  1.0
  Si  Si6  1  0.451  0.864  0.122  1.0
  Si  Si7  1  0.864  0.451  0.878  1.0
  Si  Si8  1  0.549  0.136  0.622  1.0
  Si  Si9  1  0.136  0.549  0.378  1.0
  Si  Si10  1  0.668  0.061  0.907  1.0
  Si  Si11  1  0.061  0.668  0.093  1.0
  Si  Si12  1  0.332  0.939  0.407  1.0
  Si  Si13  1  0.939  0.332  0.593  1.0
  O  O14  1  0.755  0.896  0.897  1.0
  O  O15  1  0.896  0.755  0.103  1.0
  O  O16  1  0.245  0.104  0.397  1.0
  O  O17  1  0.104  0.245  0.603  1.0
  O  O18  1  0.548  0.712  0.087  1.0
  O  O19  1  0.712  0.548  0.913  1.0
  O  O20  1  0.452  0.288  0.587  1.0
  O  O21  1  0.288  0.452  0.413  1.0
  O  O22  1  0.818  0.243  0.925  1.0
  O  O23  1  0.243  0.818  0.075  1.0
  O  O24  1  0.182  0.757  0.425  1.0
  O  O25  1  0.757  0.182  0.575  1.0
  O  O26  1  0.460  0.924  0.280  1.0
  O  O27  1  0.924  0.460  0.720  1.0
  O  O28  1  0.540  0.076  0.780  1.0
  O  O29  1  0.076  0.540  0.220  1.0
  O  O30  1  0.539  0.047  0.040  1.0
  O  O31  1  0.047  0.539  0.960  1.0
  O  O32  1  0.461  0.953  0.540  1.0
  O  O33  1  0.953  0.461  0.460  1.0
  O  O34  1  0.948  0.052  0.250  1.0
  O  O35  1  0.052  0.948  0.750  1.0
  O  O36  1  0.402  0.360  0.161  1.0
  O  O37  1  0.360  0.402  0.839  1.0
  O  O38  1  0.598  0.640  0.661  1.0
  O  O39  1  0.640  0.598  0.339  1.0
[/CIF]
.