The material described by Ca2Ga2SiO7 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(7), two equivalent O(3), and two equivalent O(6) atoms. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(7) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form GaO4 tetrahedra that share corners with two equivalent Ga(2)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with two equivalent Ga(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Ga(2)O4 tetrahedra and corners with two equivalent Ga(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(2), one Ga(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OCa2GaSi tetrahedra. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ca(2), one Ga(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Ga(1), and one Ga(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ga(1), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ca(1), one Ca(2), one Ga(1), and one Si(1) atom. In the sixth O site, O(6) is bonded to one Ca(2), two equivalent Ca(1), and one Ga(2) atom to form OCa3Ga tetrahedra that share corners with two equivalent O(1)Ca2GaSi tetrahedra, corners with two equivalent O(6)Ca3Ga tetrahedra, and  an edgeedge with one O(1)Ca2GaSi tetrahedra. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ca(1), two equivalent Ca(2), and one Si(1) atom. is represented by the CIF card [CIF]
data_Ca2Ga2SiO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.169
_cell_length_b   7.919
_cell_length_c   7.894
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   89.878
_symmetry_Int_Tables_number   1
_cell_volume   323.058
_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
  Ca  Ca0  1  0.517  0.827  0.343  1.0
  Ca  Ca1  1  0.483  0.673  0.843  1.0
  Ca  Ca2  1  0.514  0.148  0.664  1.0
  Ca  Ca3  1  0.486  0.352  0.164  1.0
  Ga  Ga4  1  0.000  0.499  0.502  1.0
  Ga  Ga5  1  1.000  0.001  0.002  1.0
  Ga  Ga6  1  0.965  0.643  0.143  1.0
  Ga  Ga7  1  0.035  0.857  0.643  1.0
  Si  Si8  1  0.946  0.356  0.857  1.0
  Si  Si9  1  0.054  0.144  0.357  1.0
  O  O10  1  0.193  0.008  0.489  1.0
  O  O11  1  0.807  0.492  0.989  1.0
  O  O12  1  0.198  0.326  0.406  1.0
  O  O13  1  0.802  0.174  0.906  1.0
  O  O14  1  0.218  0.661  0.587  1.0
  O  O15  1  0.782  0.839  0.087  1.0
  O  O16  1  0.781  0.581  0.337  1.0
  O  O17  1  0.219  0.919  0.837  1.0
  O  O18  1  0.805  0.400  0.673  1.0
  O  O19  1  0.195  0.100  0.173  1.0
  O  O20  1  0.313  0.635  0.140  1.0
  O  O21  1  0.687  0.865  0.640  1.0
  O  O22  1  0.258  0.354  0.860  1.0
  O  O23  1  0.742  0.146  0.360  1.0
[/CIF]
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The material described by Ca2Ga2SiO7 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(7), two equivalent O(3), and two equivalent O(6) atoms. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(7) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form GaO4 tetrahedra that share corners with two equivalent Ga(2)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with two equivalent Ga(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Ga(2)O4 tetrahedra and corners with two equivalent Ga(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(2), one Ga(2), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OCa2GaSi tetrahedra. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Ca(2), one Ga(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Ga(1), and one Ga(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ga(1), and one Ga(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ca(1), one Ca(2), one Ga(1), and one Si(1) atom. In the sixth O site, O(6) is bonded to one Ca(2), two equivalent Ca(1), and one Ga(2) atom to form OCa3Ga tetrahedra that share corners with two equivalent O(1)Ca2GaSi tetrahedra, corners with two equivalent O(6)Ca3Ga tetrahedra, and  an edgeedge with one O(1)Ca2GaSi tetrahedra. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ca(1), two equivalent Ca(2), and one Si(1) atom. is represented by the CIF card [CIF]
data_Ca2Ga2SiO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.169
_cell_length_b   7.919
_cell_length_c   7.894
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   89.878
_symmetry_Int_Tables_number   1
_cell_volume   323.058
_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
  Ca  Ca0  1  0.517  0.827  0.343  1.0
  Ca  Ca1  1  0.483  0.673  0.843  1.0
  Ca  Ca2  1  0.514  0.148  0.664  1.0
  Ca  Ca3  1  0.486  0.352  0.164  1.0
  Ga  Ga4  1  0.000  0.499  0.502  1.0
  Ga  Ga5  1  1.000  0.001  0.002  1.0
  Ga  Ga6  1  0.965  0.643  0.143  1.0
  Ga  Ga7  1  0.035  0.857  0.643  1.0
  Si  Si8  1  0.946  0.356  0.857  1.0
  Si  Si9  1  0.054  0.144  0.357  1.0
  O  O10  1  0.193  0.008  0.489  1.0
  O  O11  1  0.807  0.492  0.989  1.0
  O  O12  1  0.198  0.326  0.406  1.0
  O  O13  1  0.802  0.174  0.906  1.0
  O  O14  1  0.218  0.661  0.587  1.0
  O  O15  1  0.782  0.839  0.087  1.0
  O  O16  1  0.781  0.581  0.337  1.0
  O  O17  1  0.219  0.919  0.837  1.0
  O  O18  1  0.805  0.400  0.673  1.0
  O  O19  1  0.195  0.100  0.173  1.0
  O  O20  1  0.313  0.635  0.140  1.0
  O  O21  1  0.687  0.865  0.640  1.0
  O  O22  1  0.258  0.354  0.860  1.0
  O  O23  1  0.742  0.146  0.360  1.0
[/CIF]
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