The structure described by NaBeSi3O8 crystallizes in the monoclinic C2/c space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(6), one O(8), one O(9), and two equivalent O(5) atoms. Be(1) is bonded to one O(5), one O(8), and two equivalent O(3) atoms to form BeO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Be(1)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Be(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(6), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent Si(3) atoms. In the second O site, O(8) is bonded in a 3-coordinate geometry to one Na(1), one Be(1), and one Si(3) atom. In the third O site, O(9) is bonded in a bent 150 degrees geometry to two equivalent Na(1) atoms. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Si(3) atom. In the fifth O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(3) is bonded in a distorted T-shaped geometry to two equivalent Be(1) and one Si(1) atom. In the seventh O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the eighth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Be(1), and one Si(2) atom. In the ninth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(2), and one Si(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaBeSi3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.367
_cell_length_b   7.367
_cell_length_c   14.208
_cell_angle_alpha   78.090
_cell_angle_beta   78.090
_cell_angle_gamma   60.550
_symmetry_Int_Tables_number   1
_cell_volume   651.936
_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
  Na  Na0  1  0.313  0.630  0.430  1.0
  Na  Na1  1  0.370  0.687  0.070  1.0
  Na  Na2  1  0.687  0.370  0.570  1.0
  Na  Na3  1  0.630  0.313  0.930  1.0
  Be  Be4  1  0.154  0.508  0.997  1.0
  Be  Be5  1  0.492  0.846  0.503  1.0
  Be  Be6  1  0.846  0.492  0.003  1.0
  Be  Be7  1  0.508  0.154  0.497  1.0
  Si  Si8  1  0.816  0.775  0.142  1.0
  Si  Si9  1  0.225  0.184  0.358  1.0
  Si  Si10  1  0.184  0.225  0.858  1.0
  Si  Si11  1  0.775  0.816  0.642  1.0
  Si  Si12  1  0.849  0.646  0.366  1.0
  Si  Si13  1  0.354  0.151  0.134  1.0
  Si  Si14  1  0.151  0.354  0.634  1.0
  Si  Si15  1  0.646  0.849  0.866  1.0
  Si  Si16  1  0.066  0.875  0.861  1.0
  Si  Si17  1  0.125  0.934  0.639  1.0
  Si  Si18  1  0.934  0.125  0.139  1.0
  Si  Si19  1  0.875  0.066  0.361  1.0
  O  O20  1  0.961  0.894  0.126  1.0
  O  O21  1  0.106  0.039  0.374  1.0
  O  O22  1  0.039  0.106  0.874  1.0
  O  O23  1  0.894  0.961  0.626  1.0
  O  O24  1  0.940  0.579  0.615  1.0
  O  O25  1  0.421  0.060  0.885  1.0
  O  O26  1  0.060  0.421  0.385  1.0
  O  O27  1  0.579  0.940  0.115  1.0
  O  O28  1  0.924  0.595  0.070  1.0
  O  O29  1  0.405  0.076  0.430  1.0
  O  O30  1  0.076  0.405  0.930  1.0
  O  O31  1  0.595  0.924  0.570  1.0
  O  O32  1  0.202  0.323  0.745  1.0
  O  O33  1  0.677  0.798  0.755  1.0
  O  O34  1  0.798  0.677  0.255  1.0
  O  O35  1  0.323  0.202  0.245  1.0
  O  O36  1  0.345  0.345  0.555  1.0
  O  O37  1  0.655  0.655  0.945  1.0
  O  O38  1  0.655  0.655  0.445  1.0
  O  O39  1  0.345  0.345  0.055  1.0
  O  O40  1  0.927  0.818  0.375  1.0
  O  O41  1  0.182  0.073  0.125  1.0
  O  O42  1  0.073  0.182  0.625  1.0
  O  O43  1  0.818  0.927  0.875  1.0
  O  O44  1  0.174  0.826  0.750  1.0
  O  O45  1  0.826  0.174  0.250  1.0
  O  O46  1  0.203  0.691  0.938  1.0
  O  O47  1  0.309  0.797  0.562  1.0
  O  O48  1  0.797  0.309  0.062  1.0
  O  O49  1  0.691  0.203  0.438  1.0
  O  O50  1  0.431  0.569  0.250  1.0
  O  O51  1  0.569  0.431  0.750  1.0
[/CIF]
.
The structure described by NaBeSi3O8 crystallizes in the monoclinic C2/c space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(6), one O(8), one O(9), and two equivalent O(5) atoms. Be(1) is bonded to one O(5), one O(8), and two equivalent O(3) atoms to form BeO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Be(1)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Be(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(6), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent Si(3) atoms. In the second O site, O(8) is bonded in a 3-coordinate geometry to one Na(1), one Be(1), and one Si(3) atom. In the third O site, O(9) is bonded in a bent 150 degrees geometry to two equivalent Na(1) atoms. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Si(3) atom. In the fifth O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(3) is bonded in a distorted T-shaped geometry to two equivalent Be(1) and one Si(1) atom. In the seventh O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the eighth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Be(1), and one Si(2) atom. In the ninth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Si(2), and one Si(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaBeSi3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.367
_cell_length_b   7.367
_cell_length_c   14.208
_cell_angle_alpha   78.090
_cell_angle_beta   78.090
_cell_angle_gamma   60.550
_symmetry_Int_Tables_number   1
_cell_volume   651.936
_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
  Na  Na0  1  0.313  0.630  0.430  1.0
  Na  Na1  1  0.370  0.687  0.070  1.0
  Na  Na2  1  0.687  0.370  0.570  1.0
  Na  Na3  1  0.630  0.313  0.930  1.0
  Be  Be4  1  0.154  0.508  0.997  1.0
  Be  Be5  1  0.492  0.846  0.503  1.0
  Be  Be6  1  0.846  0.492  0.003  1.0
  Be  Be7  1  0.508  0.154  0.497  1.0
  Si  Si8  1  0.816  0.775  0.142  1.0
  Si  Si9  1  0.225  0.184  0.358  1.0
  Si  Si10  1  0.184  0.225  0.858  1.0
  Si  Si11  1  0.775  0.816  0.642  1.0
  Si  Si12  1  0.849  0.646  0.366  1.0
  Si  Si13  1  0.354  0.151  0.134  1.0
  Si  Si14  1  0.151  0.354  0.634  1.0
  Si  Si15  1  0.646  0.849  0.866  1.0
  Si  Si16  1  0.066  0.875  0.861  1.0
  Si  Si17  1  0.125  0.934  0.639  1.0
  Si  Si18  1  0.934  0.125  0.139  1.0
  Si  Si19  1  0.875  0.066  0.361  1.0
  O  O20  1  0.961  0.894  0.126  1.0
  O  O21  1  0.106  0.039  0.374  1.0
  O  O22  1  0.039  0.106  0.874  1.0
  O  O23  1  0.894  0.961  0.626  1.0
  O  O24  1  0.940  0.579  0.615  1.0
  O  O25  1  0.421  0.060  0.885  1.0
  O  O26  1  0.060  0.421  0.385  1.0
  O  O27  1  0.579  0.940  0.115  1.0
  O  O28  1  0.924  0.595  0.070  1.0
  O  O29  1  0.405  0.076  0.430  1.0
  O  O30  1  0.076  0.405  0.930  1.0
  O  O31  1  0.595  0.924  0.570  1.0
  O  O32  1  0.202  0.323  0.745  1.0
  O  O33  1  0.677  0.798  0.755  1.0
  O  O34  1  0.798  0.677  0.255  1.0
  O  O35  1  0.323  0.202  0.245  1.0
  O  O36  1  0.345  0.345  0.555  1.0
  O  O37  1  0.655  0.655  0.945  1.0
  O  O38  1  0.655  0.655  0.445  1.0
  O  O39  1  0.345  0.345  0.055  1.0
  O  O40  1  0.927  0.818  0.375  1.0
  O  O41  1  0.182  0.073  0.125  1.0
  O  O42  1  0.073  0.182  0.625  1.0
  O  O43  1  0.818  0.927  0.875  1.0
  O  O44  1  0.174  0.826  0.750  1.0
  O  O45  1  0.826  0.174  0.250  1.0
  O  O46  1  0.203  0.691  0.938  1.0
  O  O47  1  0.309  0.797  0.562  1.0
  O  O48  1  0.797  0.309  0.062  1.0
  O  O49  1  0.691  0.203  0.438  1.0
  O  O50  1  0.431  0.569  0.250  1.0
  O  O51  1  0.569  0.431  0.750  1.0
[/CIF]
.