The structure described by LiAlSiH2O5 crystallizes in the orthorhombic Pna2_1 space group. Li(1) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form distorted LiO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Al(1)O4 tetrahedra, corners with two equivalent Li(1)O5 trigonal bipyramids, and  an edgeedge with one Si(1)O4 tetrahedra. Al(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form AlO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with three equivalent Li(1)O5 trigonal bipyramids, and  an edgeedge with one Si(1)O4 tetrahedra. 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 corners with two equivalent Al(1)O4 tetrahedra,  a cornercorner with one Li(1)O5 trigonal bipyramid,  an edgeedge with one Al(1)O4 tetrahedra, and  an edgeedge with one Li(1)O5 trigonal bipyramid. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Al(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Al(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to two equivalent Li(1), one H(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Li(1), one Al(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Al(1) and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LiAlSiH2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.987
_cell_length_b   8.427
_cell_length_c   11.910
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   500.489
_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
  Li  Li0  1  0.930  0.970  0.386  1.0
  Li  Li1  1  0.930  0.530  0.886  1.0
  Li  Li2  1  0.430  0.030  0.614  1.0
  Li  Li3  1  0.430  0.470  0.114  1.0
  Al  Al4  1  0.447  0.691  0.736  1.0
  Al  Al5  1  0.947  0.191  0.764  1.0
  Al  Al6  1  0.447  0.809  0.236  1.0
  Al  Al7  1  0.947  0.309  0.264  1.0
  Si  Si8  1  0.858  0.664  0.286  1.0
  Si  Si9  1  0.358  0.336  0.714  1.0
  Si  Si10  1  0.358  0.164  0.214  1.0
  Si  Si11  1  0.858  0.836  0.786  1.0
  H  H12  1  0.232  0.796  0.499  1.0
  H  H13  1  0.465  0.155  0.437  1.0
  H  H14  1  0.965  0.845  0.563  1.0
  H  H15  1  0.732  0.296  0.001  1.0
  H  H16  1  0.732  0.204  0.501  1.0
  H  H17  1  0.465  0.345  0.937  1.0
  H  H18  1  0.965  0.655  0.063  1.0
  H  H19  1  0.232  0.704  0.999  1.0
  O  O20  1  0.654  0.719  0.860  1.0
  O  O21  1  0.159  0.344  0.830  1.0
  O  O22  1  0.659  0.656  0.170  1.0
  O  O23  1  0.654  0.781  0.360  1.0
  O  O24  1  0.127  0.613  0.025  1.0
  O  O25  1  0.615  0.278  0.233  1.0
  O  O26  1  0.115  0.778  0.267  1.0
  O  O27  1  0.154  0.219  0.640  1.0
  O  O28  1  0.452  0.507  0.669  1.0
  O  O29  1  0.154  0.281  0.140  1.0
  O  O30  1  0.452  0.993  0.169  1.0
  O  O31  1  0.115  0.722  0.767  1.0
  O  O32  1  0.952  0.007  0.831  1.0
  O  O33  1  0.627  0.113  0.475  1.0
  O  O34  1  0.659  0.844  0.670  1.0
  O  O35  1  0.615  0.222  0.733  1.0
  O  O36  1  0.159  0.156  0.330  1.0
  O  O37  1  0.127  0.887  0.525  1.0
  O  O38  1  0.627  0.387  0.975  1.0
  O  O39  1  0.952  0.493  0.331  1.0
[/CIF]
.
The structure described by LiAlSiH2O5 crystallizes in the orthorhombic Pna2_1 space group. Li(1) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form distorted LiO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Al(1)O4 tetrahedra, corners with two equivalent Li(1)O5 trigonal bipyramids, and  an edgeedge with one Si(1)O4 tetrahedra. Al(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form AlO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with three equivalent Li(1)O5 trigonal bipyramids, and  an edgeedge with one Si(1)O4 tetrahedra. 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 corners with two equivalent Al(1)O4 tetrahedra,  a cornercorner with one Li(1)O5 trigonal bipyramid,  an edgeedge with one Al(1)O4 tetrahedra, and  an edgeedge with one Li(1)O5 trigonal bipyramid. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Al(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Al(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to two equivalent Li(1), one H(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Li(1), one Al(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Al(1) and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LiAlSiH2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.987
_cell_length_b   8.427
_cell_length_c   11.910
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   500.489
_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
  Li  Li0  1  0.930  0.970  0.386  1.0
  Li  Li1  1  0.930  0.530  0.886  1.0
  Li  Li2  1  0.430  0.030  0.614  1.0
  Li  Li3  1  0.430  0.470  0.114  1.0
  Al  Al4  1  0.447  0.691  0.736  1.0
  Al  Al5  1  0.947  0.191  0.764  1.0
  Al  Al6  1  0.447  0.809  0.236  1.0
  Al  Al7  1  0.947  0.309  0.264  1.0
  Si  Si8  1  0.858  0.664  0.286  1.0
  Si  Si9  1  0.358  0.336  0.714  1.0
  Si  Si10  1  0.358  0.164  0.214  1.0
  Si  Si11  1  0.858  0.836  0.786  1.0
  H  H12  1  0.232  0.796  0.499  1.0
  H  H13  1  0.465  0.155  0.437  1.0
  H  H14  1  0.965  0.845  0.563  1.0
  H  H15  1  0.732  0.296  0.001  1.0
  H  H16  1  0.732  0.204  0.501  1.0
  H  H17  1  0.465  0.345  0.937  1.0
  H  H18  1  0.965  0.655  0.063  1.0
  H  H19  1  0.232  0.704  0.999  1.0
  O  O20  1  0.654  0.719  0.860  1.0
  O  O21  1  0.159  0.344  0.830  1.0
  O  O22  1  0.659  0.656  0.170  1.0
  O  O23  1  0.654  0.781  0.360  1.0
  O  O24  1  0.127  0.613  0.025  1.0
  O  O25  1  0.615  0.278  0.233  1.0
  O  O26  1  0.115  0.778  0.267  1.0
  O  O27  1  0.154  0.219  0.640  1.0
  O  O28  1  0.452  0.507  0.669  1.0
  O  O29  1  0.154  0.281  0.140  1.0
  O  O30  1  0.452  0.993  0.169  1.0
  O  O31  1  0.115  0.722  0.767  1.0
  O  O32  1  0.952  0.007  0.831  1.0
  O  O33  1  0.627  0.113  0.475  1.0
  O  O34  1  0.659  0.844  0.670  1.0
  O  O35  1  0.615  0.222  0.733  1.0
  O  O36  1  0.159  0.156  0.330  1.0
  O  O37  1  0.127  0.887  0.525  1.0
  O  O38  1  0.627  0.387  0.975  1.0
  O  O39  1  0.952  0.493  0.331  1.0
[/CIF]
.