The material structure described by SrCaZnSi2O7 crystallizes in the monoclinic P2_1 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), one O(6), one O(7), two equivalent O(2), and two equivalent O(4) atoms. Ca(1) is bonded in a 8-coordinate geometry to one O(2), one O(5), one O(6), one O(7), two equivalent O(1), and two equivalent O(3) atoms. Zn(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form ZnO4 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(1), one O(3), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Ca(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Ca(1), and one Si(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Zn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Zn(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Zn(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Zn(1), and one Si(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Si(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_SrCaZnSi2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.014
_cell_length_b   5.133
_cell_length_c   8.006
_cell_angle_alpha   89.106
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   329.297
_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
  Sr  Sr0  1  0.164  0.492  0.086  1.0
  Sr  Sr1  1  0.664  0.508  0.914  1.0
  Ca  Ca2  1  0.827  0.497  0.420  1.0
  Ca  Ca3  1  0.327  0.503  0.580  1.0
  Zn  Zn4  1  0.501  1.000  0.252  1.0
  Zn  Zn5  1  0.001  0.000  0.748  1.0
  Si  Si6  1  0.640  0.060  0.605  1.0
  Si  Si7  1  0.140  0.940  0.395  1.0
  Si  Si8  1  0.361  0.056  0.884  1.0
  Si  Si9  1  0.861  0.944  0.116  1.0
  O  O10  1  0.643  0.746  0.603  1.0
  O  O11  1  0.143  0.254  0.397  1.0
  O  O12  1  0.361  0.742  0.884  1.0
  O  O13  1  0.861  0.258  0.116  1.0
  O  O14  1  0.584  0.219  0.433  1.0
  O  O15  1  0.084  0.781  0.567  1.0
  O  O16  1  0.420  0.199  0.057  1.0
  O  O17  1  0.920  0.801  0.943  1.0
  O  O18  1  0.690  0.790  0.175  1.0
  O  O19  1  0.190  0.210  0.825  1.0
  O  O20  1  0.313  0.790  0.338  1.0
  O  O21  1  0.813  0.210  0.662  1.0
  O  O22  1  0.998  0.829  0.258  1.0
  O  O23  1  0.498  0.171  0.742  1.0
[/CIF]
.
The material structure described by SrCaZnSi2O7 crystallizes in the monoclinic P2_1 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), one O(6), one O(7), two equivalent O(2), and two equivalent O(4) atoms. Ca(1) is bonded in a 8-coordinate geometry to one O(2), one O(5), one O(6), one O(7), two equivalent O(1), and two equivalent O(3) atoms. Zn(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form ZnO4 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(1), one O(3), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Ca(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Ca(1), and one Si(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Zn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Zn(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Zn(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Zn(1), and one Si(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Si(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_SrCaZnSi2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.014
_cell_length_b   5.133
_cell_length_c   8.006
_cell_angle_alpha   89.106
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   329.297
_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
  Sr  Sr0  1  0.164  0.492  0.086  1.0
  Sr  Sr1  1  0.664  0.508  0.914  1.0
  Ca  Ca2  1  0.827  0.497  0.420  1.0
  Ca  Ca3  1  0.327  0.503  0.580  1.0
  Zn  Zn4  1  0.501  1.000  0.252  1.0
  Zn  Zn5  1  0.001  0.000  0.748  1.0
  Si  Si6  1  0.640  0.060  0.605  1.0
  Si  Si7  1  0.140  0.940  0.395  1.0
  Si  Si8  1  0.361  0.056  0.884  1.0
  Si  Si9  1  0.861  0.944  0.116  1.0
  O  O10  1  0.643  0.746  0.603  1.0
  O  O11  1  0.143  0.254  0.397  1.0
  O  O12  1  0.361  0.742  0.884  1.0
  O  O13  1  0.861  0.258  0.116  1.0
  O  O14  1  0.584  0.219  0.433  1.0
  O  O15  1  0.084  0.781  0.567  1.0
  O  O16  1  0.420  0.199  0.057  1.0
  O  O17  1  0.920  0.801  0.943  1.0
  O  O18  1  0.690  0.790  0.175  1.0
  O  O19  1  0.190  0.210  0.825  1.0
  O  O20  1  0.313  0.790  0.338  1.0
  O  O21  1  0.813  0.210  0.662  1.0
  O  O22  1  0.998  0.829  0.258  1.0
  O  O23  1  0.498  0.171  0.742  1.0
[/CIF]
.