The material structure described by K2Be2Zn2Si3O11 crystallizes in the orthorhombic Imma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(4), and four equivalent O(2) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(5) and four equivalent O(2) 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, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Be(1)O4 tetrahedra. Zn(1) is bonded to two equivalent O(4) and two equivalent O(5) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Zn(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(4), and two equivalent O(2) atoms to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Be(1)O4 tetrahedra, and corners with two equivalent Zn(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to two equivalent O(1) and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra and corners with four equivalent Zn(1)O4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(1), two equivalent Be(1), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one K(1), one K(2), one Be(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(1) and two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), two equivalent Zn(1), and one Si(1) atom. In the fifth O site, O(5) is bonded to one K(2), two equivalent Zn(1), and one Si(2) atom to form a mixture of distorted edge and corner-sharing OKZn2Si tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Be2Zn2Si3O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.646
_cell_length_b   9.646
_cell_length_c   9.646
_cell_angle_alpha   138.550
_cell_angle_beta   119.266
_cell_angle_gamma   76.208
_symmetry_Int_Tables_number   1
_cell_volume   505.362
_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  0.388  0.138  0.250  1.0
  K  K1  1  0.199  0.449  0.750  1.0
  K  K2  1  0.612  0.862  0.750  1.0
  K  K3  1  0.801  0.551  0.250  1.0
  Be  Be4  1  0.000  0.175  0.175  1.0
  Be  Be5  1  0.500  0.825  0.325  1.0
  Be  Be6  1  0.000  0.825  0.825  1.0
  Be  Be7  1  0.500  0.175  0.675  1.0
  Zn  Zn8  1  0.849  0.500  0.849  1.0
  Zn  Zn9  1  0.151  0.000  0.651  1.0
  Zn  Zn10  1  0.849  0.000  0.349  1.0
  Zn  Zn11  1  0.151  0.500  0.151  1.0
  Si  Si12  1  0.777  0.367  0.410  1.0
  Si  Si13  1  0.457  0.367  0.090  1.0
  Si  Si14  1  0.223  0.633  0.590  1.0
  Si  Si15  1  0.847  0.097  0.750  1.0
  Si  Si16  1  0.153  0.903  0.250  1.0
  Si  Si17  1  0.543  0.633  0.910  1.0
  O  O18  1  0.076  0.964  0.111  1.0
  O  O19  1  0.353  0.964  0.389  1.0
  O  O20  1  0.856  0.222  0.235  1.0
  O  O21  1  0.422  0.672  0.750  1.0
  O  O22  1  0.269  0.277  0.992  1.0
  O  O23  1  0.578  0.328  0.250  1.0
  O  O24  1  0.089  0.642  0.053  1.0
  O  O25  1  0.784  0.277  0.508  1.0
  O  O26  1  0.216  0.723  0.492  1.0
  O  O27  1  0.513  0.778  0.135  1.0
  O  O28  1  0.513  0.379  0.735  1.0
  O  O29  1  0.924  0.036  0.889  1.0
  O  O30  1  0.856  0.621  0.635  1.0
  O  O31  1  0.487  0.621  0.265  1.0
  O  O32  1  0.144  0.778  0.765  1.0
  O  O33  1  0.487  0.222  0.865  1.0
  O  O34  1  0.911  0.963  0.553  1.0
  O  O35  1  0.731  0.723  0.008  1.0
  O  O36  1  0.911  0.358  0.947  1.0
  O  O37  1  0.089  0.037  0.447  1.0
  O  O38  1  0.647  0.036  0.611  1.0
  O  O39  1  0.144  0.379  0.365  1.0
[/CIF]
.
The material structure described by K2Be2Zn2Si3O11 crystallizes in the orthorhombic Imma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(4), and four equivalent O(2) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(5) and four equivalent O(2) 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, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Be(1)O4 tetrahedra. Zn(1) is bonded to two equivalent O(4) and two equivalent O(5) atoms to form ZnO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Zn(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(4), and two equivalent O(2) atoms to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Be(1)O4 tetrahedra, and corners with two equivalent Zn(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to two equivalent O(1) and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra and corners with four equivalent Zn(1)O4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(1), two equivalent Be(1), and one Si(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one K(1), one K(2), one Be(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(1) and two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), two equivalent Zn(1), and one Si(1) atom. In the fifth O site, O(5) is bonded to one K(2), two equivalent Zn(1), and one Si(2) atom to form a mixture of distorted edge and corner-sharing OKZn2Si tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Be2Zn2Si3O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.646
_cell_length_b   9.646
_cell_length_c   9.646
_cell_angle_alpha   138.550
_cell_angle_beta   119.266
_cell_angle_gamma   76.208
_symmetry_Int_Tables_number   1
_cell_volume   505.362
_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  0.388  0.138  0.250  1.0
  K  K1  1  0.199  0.449  0.750  1.0
  K  K2  1  0.612  0.862  0.750  1.0
  K  K3  1  0.801  0.551  0.250  1.0
  Be  Be4  1  0.000  0.175  0.175  1.0
  Be  Be5  1  0.500  0.825  0.325  1.0
  Be  Be6  1  0.000  0.825  0.825  1.0
  Be  Be7  1  0.500  0.175  0.675  1.0
  Zn  Zn8  1  0.849  0.500  0.849  1.0
  Zn  Zn9  1  0.151  0.000  0.651  1.0
  Zn  Zn10  1  0.849  0.000  0.349  1.0
  Zn  Zn11  1  0.151  0.500  0.151  1.0
  Si  Si12  1  0.777  0.367  0.410  1.0
  Si  Si13  1  0.457  0.367  0.090  1.0
  Si  Si14  1  0.223  0.633  0.590  1.0
  Si  Si15  1  0.847  0.097  0.750  1.0
  Si  Si16  1  0.153  0.903  0.250  1.0
  Si  Si17  1  0.543  0.633  0.910  1.0
  O  O18  1  0.076  0.964  0.111  1.0
  O  O19  1  0.353  0.964  0.389  1.0
  O  O20  1  0.856  0.222  0.235  1.0
  O  O21  1  0.422  0.672  0.750  1.0
  O  O22  1  0.269  0.277  0.992  1.0
  O  O23  1  0.578  0.328  0.250  1.0
  O  O24  1  0.089  0.642  0.053  1.0
  O  O25  1  0.784  0.277  0.508  1.0
  O  O26  1  0.216  0.723  0.492  1.0
  O  O27  1  0.513  0.778  0.135  1.0
  O  O28  1  0.513  0.379  0.735  1.0
  O  O29  1  0.924  0.036  0.889  1.0
  O  O30  1  0.856  0.621  0.635  1.0
  O  O31  1  0.487  0.621  0.265  1.0
  O  O32  1  0.144  0.778  0.765  1.0
  O  O33  1  0.487  0.222  0.865  1.0
  O  O34  1  0.911  0.963  0.553  1.0
  O  O35  1  0.731  0.723  0.008  1.0
  O  O36  1  0.911  0.358  0.947  1.0
  O  O37  1  0.089  0.037  0.447  1.0
  O  O38  1  0.647  0.036  0.611  1.0
  O  O39  1  0.144  0.379  0.365  1.0
[/CIF]
.