The crystal structure described by (CaAl2(Si2O7)2)4(O2)5 crystallizes in the monoclinic C2/m space group. The structure consists of two tetraoxetane molecules and two water atoms inside a CaAl2(Si2O7)2 framework. In the CaAl2(Si2O7)2 framework, Ca(1) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(2), and two equivalent O(3) atoms. Al(1) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form AlO4 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(2), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Ca(1), one Al(1), and one Si(2) atom. In the second O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the third O site, O(5) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the fourth O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent Si(2) atoms. In the fifth O site, O(7) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(2) atom. In the sixth O site, O(11) is bonded in a distorted L-shaped geometry to one Ca(1) and one O(11) atom. In the seventh O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the eighth O site, O(2) is bonded in a distorted trigonal planar geometry to one Ca(1), one Al(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Ca2Al4Si8O33
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.042
_cell_length_b   10.042
_cell_length_c   7.537
_cell_angle_alpha   75.278
_cell_angle_beta   75.278
_cell_angle_gamma   82.900
_symmetry_Int_Tables_number   1
_cell_volume   709.521
_cell_formula_units_Z   1
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  0.738  0.738  0.280  1.0
  Ca  Ca1  1  0.262  0.262  0.720  1.0
  Al  Al2  1  0.825  0.433  0.271  1.0
  Al  Al3  1  0.433  0.825  0.271  1.0
  Al  Al4  1  0.175  0.567  0.729  1.0
  Al  Al5  1  0.567  0.175  0.729  1.0
  Si  Si6  1  0.852  0.617  0.857  1.0
  Si  Si7  1  0.617  0.852  0.857  1.0
  Si  Si8  1  0.148  0.383  0.143  1.0
  Si  Si9  1  0.383  0.148  0.143  1.0
  Si  Si10  1  0.696  0.460  0.687  1.0
  Si  Si11  1  0.460  0.696  0.687  1.0
  Si  Si12  1  0.304  0.540  0.313  1.0
  Si  Si13  1  0.540  0.304  0.313  1.0
  O  O14  1  0.755  0.755  0.786  1.0
  O  O15  1  0.245  0.245  0.214  1.0
  O  O16  1  0.831  0.590  0.087  1.0
  O  O17  1  0.590  0.831  0.087  1.0
  O  O18  1  0.169  0.410  0.913  1.0
  O  O19  1  0.410  0.169  0.913  1.0
  O  O20  1  0.766  0.521  0.461  1.0
  O  O21  1  0.521  0.766  0.461  1.0
  O  O22  1  0.234  0.479  0.539  1.0
  O  O23  1  0.479  0.234  0.539  1.0
  O  O24  1  0.801  0.483  0.811  1.0
  O  O25  1  0.483  0.801  0.811  1.0
  O  O26  1  0.199  0.517  0.189  1.0
  O  O27  1  0.517  0.199  0.189  1.0
  O  O28  1  0.010  0.646  0.747  1.0
  O  O29  1  0.646  0.010  0.747  1.0
  O  O30  1  0.990  0.354  0.253  1.0
  O  O31  1  0.354  0.990  0.253  1.0
  O  O32  1  0.550  0.550  0.742  1.0
  O  O33  1  0.450  0.450  0.258  1.0
  O  O34  1  0.702  0.326  0.274  1.0
  O  O35  1  0.326  0.702  0.274  1.0
  O  O36  1  0.298  0.674  0.726  1.0
  O  O37  1  0.674  0.298  0.726  1.0
  O  O38  1  0.921  0.079  0.000  1.0
  O  O39  1  0.079  0.921  0.000  1.0
  O  O40  1  0.939  0.939  0.961  1.0
  O  O41  1  0.061  0.061  0.039  1.0
  O  O42  1  0.000  0.000  0.500  1.0
  O  O43  1  0.071  0.166  0.618  1.0
  O  O44  1  0.166  0.071  0.618  1.0
  O  O45  1  0.929  0.834  0.382  1.0
  O  O46  1  0.834  0.929  0.382  1.0
[/CIF]
.
The crystal structure described by (CaAl2(Si2O7)2)4(O2)5 crystallizes in the monoclinic C2/m space group. The structure consists of two tetraoxetane molecules and two water atoms inside a CaAl2(Si2O7)2 framework. In the CaAl2(Si2O7)2 framework, Ca(1) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(2), and two equivalent O(3) atoms. Al(1) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form AlO4 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(2), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Ca(1), one Al(1), and one Si(2) atom. In the second O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the third O site, O(5) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the fourth O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent Si(2) atoms. In the fifth O site, O(7) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(2) atom. In the sixth O site, O(11) is bonded in a distorted L-shaped geometry to one Ca(1) and one O(11) atom. In the seventh O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the eighth O site, O(2) is bonded in a distorted trigonal planar geometry to one Ca(1), one Al(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Ca2Al4Si8O33
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.042
_cell_length_b   10.042
_cell_length_c   7.537
_cell_angle_alpha   75.278
_cell_angle_beta   75.278
_cell_angle_gamma   82.900
_symmetry_Int_Tables_number   1
_cell_volume   709.521
_cell_formula_units_Z   1
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  0.738  0.738  0.280  1.0
  Ca  Ca1  1  0.262  0.262  0.720  1.0
  Al  Al2  1  0.825  0.433  0.271  1.0
  Al  Al3  1  0.433  0.825  0.271  1.0
  Al  Al4  1  0.175  0.567  0.729  1.0
  Al  Al5  1  0.567  0.175  0.729  1.0
  Si  Si6  1  0.852  0.617  0.857  1.0
  Si  Si7  1  0.617  0.852  0.857  1.0
  Si  Si8  1  0.148  0.383  0.143  1.0
  Si  Si9  1  0.383  0.148  0.143  1.0
  Si  Si10  1  0.696  0.460  0.687  1.0
  Si  Si11  1  0.460  0.696  0.687  1.0
  Si  Si12  1  0.304  0.540  0.313  1.0
  Si  Si13  1  0.540  0.304  0.313  1.0
  O  O14  1  0.755  0.755  0.786  1.0
  O  O15  1  0.245  0.245  0.214  1.0
  O  O16  1  0.831  0.590  0.087  1.0
  O  O17  1  0.590  0.831  0.087  1.0
  O  O18  1  0.169  0.410  0.913  1.0
  O  O19  1  0.410  0.169  0.913  1.0
  O  O20  1  0.766  0.521  0.461  1.0
  O  O21  1  0.521  0.766  0.461  1.0
  O  O22  1  0.234  0.479  0.539  1.0
  O  O23  1  0.479  0.234  0.539  1.0
  O  O24  1  0.801  0.483  0.811  1.0
  O  O25  1  0.483  0.801  0.811  1.0
  O  O26  1  0.199  0.517  0.189  1.0
  O  O27  1  0.517  0.199  0.189  1.0
  O  O28  1  0.010  0.646  0.747  1.0
  O  O29  1  0.646  0.010  0.747  1.0
  O  O30  1  0.990  0.354  0.253  1.0
  O  O31  1  0.354  0.990  0.253  1.0
  O  O32  1  0.550  0.550  0.742  1.0
  O  O33  1  0.450  0.450  0.258  1.0
  O  O34  1  0.702  0.326  0.274  1.0
  O  O35  1  0.326  0.702  0.274  1.0
  O  O36  1  0.298  0.674  0.726  1.0
  O  O37  1  0.674  0.298  0.726  1.0
  O  O38  1  0.921  0.079  0.000  1.0
  O  O39  1  0.079  0.921  0.000  1.0
  O  O40  1  0.939  0.939  0.961  1.0
  O  O41  1  0.061  0.061  0.039  1.0
  O  O42  1  0.000  0.000  0.500  1.0
  O  O43  1  0.071  0.166  0.618  1.0
  O  O44  1  0.166  0.071  0.618  1.0
  O  O45  1  0.929  0.834  0.382  1.0
  O  O46  1  0.834  0.929  0.382  1.0
[/CIF]
.