The material described by La5AlSi2O13 crystallizes in the monoclinic Pm space group. There are eight inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(1), one O(14), one O(19), two equivalent O(11), and two equivalent O(9) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(15), one O(19), one O(2), two equivalent O(12), and two equivalent O(7) atoms. In the third La site, La(3) is bonded in a 7-coordinate geometry to one O(13), one O(19), one O(3), two equivalent O(10), and two equivalent O(8) atoms. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one O(17), one O(20), one O(4), two equivalent O(12), and two equivalent O(8) atoms. In the fifth La site, La(5) is bonded in a 7-coordinate geometry to one O(18), one O(20), one O(5), two equivalent O(10), and two equivalent O(9) atoms. In the sixth La site, La(6) is bonded in a 7-coordinate geometry to one O(16), one O(20), one O(6), two equivalent O(11), and two equivalent O(7) atoms. In the seventh La site, La(7) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(16), one O(17), one O(18), one O(2), and one O(3) atom. In the eighth La site, La(8) is bonded in a 9-coordinate geometry to one O(13), one O(14), one O(15), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a tetrahedral geometry to one O(1), one O(13), and two equivalent O(7) atoms. In the second Al site, Al(2) is bonded in a tetrahedral geometry to one O(17), one O(5), and two equivalent O(11) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(14), one O(2), and two equivalent O(8) atoms. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(15), one O(3), and two equivalent O(9) atoms. In the third Si site, Si(3) is bonded in a tetrahedral geometry to one O(16), one O(4), and two equivalent O(10) atoms. In the fourth Si site, Si(4) is bonded in a tetrahedral geometry to one O(18), one O(6), and two equivalent O(12) atoms. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one La(1), two equivalent La(7), and one Al(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one La(2), two equivalent La(7), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one La(3), two equivalent La(7), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one La(4), two equivalent La(8), and one Si(3) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one La(5), two equivalent La(8), and one Al(2) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one La(6), two equivalent La(8), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one La(2), one La(6), one La(8), and one Al(1) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one La(3), one La(4), one La(8), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 1-coordinate geometry to one La(1), one La(5), one La(8), and one Si(2) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one La(3), one La(5), one La(7), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one La(1), one La(6), one La(7), and one Al(2) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one La(2), one La(4), one La(7), and one Si(4) atom. In the thirteenth O site, O(13) is bonded to one La(3), two equivalent La(8), and one Al(1) atom to form distorted edge-sharing OLa3Al tetrahedra. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one La(1), two equivalent La(8), and one Si(1) atom. In the fifteenth O site, O(15) is bonded to one La(2), two equivalent La(8), and one Si(2) atom to form distorted edge-sharing OLa3Si tetrahedra. In the sixteenth O site, O(16) is bonded to one La(6), two equivalent La(7), and one Si(3) atom to form distorted edge-sharing OLa3Si tetrahedra. In the seventeenth O site, O(17) is bonded to one La(4), two equivalent La(7), and one Al(2) atom to form distorted edge-sharing OLa3Al tetrahedra. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one La(5), two equivalent La(7), and one Si(4) atom. In the nineteenth O site, O(19) is bonded in a trigonal planar geometry to one La(1), one La(2), and one La(3) atom. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one La(4), one La(5), and one La(6) atom. is represented by the CIF card [CIF]
data_La5AlSi2O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.252
_cell_length_b   9.813
_cell_length_c   9.816
_cell_angle_alpha   60.192
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   606.057
_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
  La  La0  1  0.000  0.770  0.987  1.0
  La  La1  1  0.000  0.234  0.763  1.0
  La  La2  1  0.000  0.995  0.243  1.0
  La  La3  1  0.500  0.238  0.003  1.0
  La  La4  1  0.500  0.758  0.231  1.0
  La  La5  1  0.500  0.003  0.763  1.0
  La  La6  1  0.250  0.666  0.673  1.0
  La  La7  1  0.750  0.331  0.337  1.0
  La  La8  1  0.750  0.666  0.673  1.0
  La  La9  1  0.250  0.331  0.337  1.0
  Al  Al10  1  0.000  0.029  0.596  1.0
  Al  Al11  1  0.500  0.625  0.974  1.0
  Si  Si12  1  0.000  0.371  0.031  1.0
  Si  Si13  1  0.000  0.599  0.372  1.0
  Si  Si14  1  0.500  0.969  0.401  1.0
  Si  Si15  1  0.500  0.403  0.627  1.0
  O  O16  1  0.000  0.825  0.674  1.0
  O  O17  1  0.000  0.487  0.840  1.0
  O  O18  1  0.000  0.670  0.491  1.0
  O  O19  1  0.500  0.159  0.330  1.0
  O  O20  1  0.500  0.499  0.178  1.0
  O  O21  1  0.500  0.330  0.510  1.0
  O  O22  1  0.191  0.094  0.660  1.0
  O  O23  1  0.183  0.256  0.085  1.0
  O  O24  1  0.183  0.659  0.256  1.0
  O  O25  1  0.683  0.913  0.341  1.0
  O  O26  1  0.693  0.752  0.909  1.0
  O  O27  1  0.682  0.343  0.744  1.0
  O  O28  1  0.000  0.137  0.389  1.0
  O  O29  1  0.000  0.469  0.127  1.0
  O  O30  1  0.000  0.405  0.467  1.0
  O  O31  1  0.500  0.872  0.595  1.0
  O  O32  1  0.500  0.527  0.863  1.0
  O  O33  1  0.500  0.597  0.529  1.0
  O  O34  1  0.000  0.001  0.003  1.0
  O  O35  1  0.500  0.000  0.005  1.0
  O  O36  1  0.809  0.094  0.660  1.0
  O  O37  1  0.817  0.256  0.085  1.0
  O  O38  1  0.817  0.659  0.256  1.0
  O  O39  1  0.317  0.913  0.341  1.0
  O  O40  1  0.307  0.752  0.909  1.0
  O  O41  1  0.318  0.343  0.744  1.0
[/CIF]
.
The material described by La5AlSi2O13 crystallizes in the monoclinic Pm space group. There are eight inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(1), one O(14), one O(19), two equivalent O(11), and two equivalent O(9) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(15), one O(19), one O(2), two equivalent O(12), and two equivalent O(7) atoms. In the third La site, La(3) is bonded in a 7-coordinate geometry to one O(13), one O(19), one O(3), two equivalent O(10), and two equivalent O(8) atoms. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one O(17), one O(20), one O(4), two equivalent O(12), and two equivalent O(8) atoms. In the fifth La site, La(5) is bonded in a 7-coordinate geometry to one O(18), one O(20), one O(5), two equivalent O(10), and two equivalent O(9) atoms. In the sixth La site, La(6) is bonded in a 7-coordinate geometry to one O(16), one O(20), one O(6), two equivalent O(11), and two equivalent O(7) atoms. In the seventh La site, La(7) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(16), one O(17), one O(18), one O(2), and one O(3) atom. In the eighth La site, La(8) is bonded in a 9-coordinate geometry to one O(13), one O(14), one O(15), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a tetrahedral geometry to one O(1), one O(13), and two equivalent O(7) atoms. In the second Al site, Al(2) is bonded in a tetrahedral geometry to one O(17), one O(5), and two equivalent O(11) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(14), one O(2), and two equivalent O(8) atoms. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(15), one O(3), and two equivalent O(9) atoms. In the third Si site, Si(3) is bonded in a tetrahedral geometry to one O(16), one O(4), and two equivalent O(10) atoms. In the fourth Si site, Si(4) is bonded in a tetrahedral geometry to one O(18), one O(6), and two equivalent O(12) atoms. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one La(1), two equivalent La(7), and one Al(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one La(2), two equivalent La(7), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one La(3), two equivalent La(7), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one La(4), two equivalent La(8), and one Si(3) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one La(5), two equivalent La(8), and one Al(2) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one La(6), two equivalent La(8), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one La(2), one La(6), one La(8), and one Al(1) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one La(3), one La(4), one La(8), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 1-coordinate geometry to one La(1), one La(5), one La(8), and one Si(2) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one La(3), one La(5), one La(7), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one La(1), one La(6), one La(7), and one Al(2) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one La(2), one La(4), one La(7), and one Si(4) atom. In the thirteenth O site, O(13) is bonded to one La(3), two equivalent La(8), and one Al(1) atom to form distorted edge-sharing OLa3Al tetrahedra. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one La(1), two equivalent La(8), and one Si(1) atom. In the fifteenth O site, O(15) is bonded to one La(2), two equivalent La(8), and one Si(2) atom to form distorted edge-sharing OLa3Si tetrahedra. In the sixteenth O site, O(16) is bonded to one La(6), two equivalent La(7), and one Si(3) atom to form distorted edge-sharing OLa3Si tetrahedra. In the seventeenth O site, O(17) is bonded to one La(4), two equivalent La(7), and one Al(2) atom to form distorted edge-sharing OLa3Al tetrahedra. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one La(5), two equivalent La(7), and one Si(4) atom. In the nineteenth O site, O(19) is bonded in a trigonal planar geometry to one La(1), one La(2), and one La(3) atom. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one La(4), one La(5), and one La(6) atom. is represented by the CIF card [CIF]
data_La5AlSi2O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.252
_cell_length_b   9.813
_cell_length_c   9.816
_cell_angle_alpha   60.192
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   606.057
_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
  La  La0  1  0.000  0.770  0.987  1.0
  La  La1  1  0.000  0.234  0.763  1.0
  La  La2  1  0.000  0.995  0.243  1.0
  La  La3  1  0.500  0.238  0.003  1.0
  La  La4  1  0.500  0.758  0.231  1.0
  La  La5  1  0.500  0.003  0.763  1.0
  La  La6  1  0.250  0.666  0.673  1.0
  La  La7  1  0.750  0.331  0.337  1.0
  La  La8  1  0.750  0.666  0.673  1.0
  La  La9  1  0.250  0.331  0.337  1.0
  Al  Al10  1  0.000  0.029  0.596  1.0
  Al  Al11  1  0.500  0.625  0.974  1.0
  Si  Si12  1  0.000  0.371  0.031  1.0
  Si  Si13  1  0.000  0.599  0.372  1.0
  Si  Si14  1  0.500  0.969  0.401  1.0
  Si  Si15  1  0.500  0.403  0.627  1.0
  O  O16  1  0.000  0.825  0.674  1.0
  O  O17  1  0.000  0.487  0.840  1.0
  O  O18  1  0.000  0.670  0.491  1.0
  O  O19  1  0.500  0.159  0.330  1.0
  O  O20  1  0.500  0.499  0.178  1.0
  O  O21  1  0.500  0.330  0.510  1.0
  O  O22  1  0.191  0.094  0.660  1.0
  O  O23  1  0.183  0.256  0.085  1.0
  O  O24  1  0.183  0.659  0.256  1.0
  O  O25  1  0.683  0.913  0.341  1.0
  O  O26  1  0.693  0.752  0.909  1.0
  O  O27  1  0.682  0.343  0.744  1.0
  O  O28  1  0.000  0.137  0.389  1.0
  O  O29  1  0.000  0.469  0.127  1.0
  O  O30  1  0.000  0.405  0.467  1.0
  O  O31  1  0.500  0.872  0.595  1.0
  O  O32  1  0.500  0.527  0.863  1.0
  O  O33  1  0.500  0.597  0.529  1.0
  O  O34  1  0.000  0.001  0.003  1.0
  O  O35  1  0.500  0.000  0.005  1.0
  O  O36  1  0.809  0.094  0.660  1.0
  O  O37  1  0.817  0.256  0.085  1.0
  O  O38  1  0.817  0.659  0.256  1.0
  O  O39  1  0.317  0.913  0.341  1.0
  O  O40  1  0.307  0.752  0.909  1.0
  O  O41  1  0.318  0.343  0.744  1.0
[/CIF]
.