The crystal structure described by NaCaMgAl(SiO3)4 crystallizes in the monoclinic Pc space group. Na(1) is bonded in a 5-coordinate geometry to one O(10), one O(3), one O(4), one O(6), and one O(9) atom. Ca(1) is bonded to one O(1), one O(10), one O(9), and two equivalent O(4) atoms to form distorted CaO5 trigonal bipyramids that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O5 trigonal bipyramid, corners with two equivalent Ca(1)O5 trigonal bipyramids, and  an edgeedge with one Al(1)O4 tetrahedra. Mg(1) is bonded in a 5-coordinate geometry to one O(2), one O(5), one O(6), one O(8), and one O(9) atom. Al(1) is bonded to one O(1), one O(4), one O(7), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ca(1)O5 trigonal bipyramid, corners with two equivalent Si(4)O5 trigonal bipyramids, and  an edgeedge with one Ca(1)O5 trigonal bipyramid. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ca(1)O5 trigonal bipyramid, and  a cornercorner with one Si(4)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(11), one O(12), one O(2), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Si(4)O5 trigonal bipyramids. In the third Si site, Si(3) is bonded in a trigonal planar geometry to one O(10), one O(3), and one O(6) atom. In the fourth Si site, Si(4) is bonded to one O(1), one O(11), one O(12), one O(5), and one O(8) atom to form SiO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  a cornercorner with one Ca(1)O5 trigonal bipyramid. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one Al(1), and one Si(4) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one Si(1), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Na(1), one Si(1), and one Si(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Ca(1), and one Al(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one Si(1), and one Si(4) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Na(1), one Mg(1), and one Si(3) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Mg(1), one Al(1), and one Si(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Ca(1), one Mg(1), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(1), one Ca(1), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaCaMgAl(SiO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.371
_cell_length_b   7.844
_cell_length_c   7.648
_cell_angle_alpha   90.000
_cell_angle_beta   106.746
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   538.311
_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
  Na  Na0  1  0.068  0.793  0.388  1.0
  Na  Na1  1  0.068  0.207  0.888  1.0
  Ca  Ca2  1  0.201  0.849  0.996  1.0
  Ca  Ca3  1  0.201  0.151  0.496  1.0
  Mg  Mg4  1  0.787  0.875  0.580  1.0
  Mg  Mg5  1  0.787  0.125  0.080  1.0
  Al  Al6  1  0.431  0.888  0.442  1.0
  Al  Al7  1  0.431  0.112  0.942  1.0
  Si  Si8  1  0.836  0.788  0.989  1.0
  Si  Si9  1  0.559  0.622  0.759  1.0
  Si  Si10  1  0.836  0.212  0.489  1.0
  Si  Si11  1  0.559  0.378  0.259  1.0
  Si  Si12  1  0.007  0.547  0.690  1.0
  Si  Si13  1  0.007  0.453  0.190  1.0
  Si  Si14  1  0.578  0.224  0.656  1.0
  Si  Si15  1  0.578  0.776  0.156  1.0
  O  O16  1  0.444  0.080  0.572  1.0
  O  O17  1  0.444  0.920  0.072  1.0
  O  O18  1  0.734  0.283  0.287  1.0
  O  O19  1  0.942  0.637  0.117  1.0
  O  O20  1  0.246  0.914  0.301  1.0
  O  O21  1  0.734  0.717  0.787  1.0
  O  O22  1  0.743  0.140  0.628  1.0
  O  O23  1  0.942  0.363  0.617  1.0
  O  O24  1  0.246  0.086  0.801  1.0
  O  O25  1  0.944  0.291  0.074  1.0
  O  O26  1  0.743  0.860  0.128  1.0
  O  O27  1  0.944  0.709  0.574  1.0
  O  O28  1  0.444  0.294  0.084  1.0
  O  O29  1  0.603  0.869  0.376  1.0
  O  O30  1  0.940  0.061  0.455  1.0
  O  O31  1  0.444  0.706  0.584  1.0
  O  O32  1  0.603  0.131  0.876  1.0
  O  O33  1  0.121  0.554  0.885  1.0
  O  O34  1  0.593  0.581  0.258  1.0
  O  O35  1  0.940  0.939  0.955  1.0
  O  O36  1  0.121  0.446  0.385  1.0
  O  O37  1  0.593  0.419  0.758  1.0
  O  O38  1  0.527  0.670  0.947  1.0
  O  O39  1  0.527  0.330  0.447  1.0
[/CIF]
.
The crystal structure described by NaCaMgAl(SiO3)4 crystallizes in the monoclinic Pc space group. Na(1) is bonded in a 5-coordinate geometry to one O(10), one O(3), one O(4), one O(6), and one O(9) atom. Ca(1) is bonded to one O(1), one O(10), one O(9), and two equivalent O(4) atoms to form distorted CaO5 trigonal bipyramids that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O5 trigonal bipyramid, corners with two equivalent Ca(1)O5 trigonal bipyramids, and  an edgeedge with one Al(1)O4 tetrahedra. Mg(1) is bonded in a 5-coordinate geometry to one O(2), one O(5), one O(6), one O(8), and one O(9) atom. Al(1) is bonded to one O(1), one O(4), one O(7), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ca(1)O5 trigonal bipyramid, corners with two equivalent Si(4)O5 trigonal bipyramids, and  an edgeedge with one Ca(1)O5 trigonal bipyramid. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Ca(1)O5 trigonal bipyramid, and  a cornercorner with one Si(4)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(11), one O(12), one O(2), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Si(4)O5 trigonal bipyramids. In the third Si site, Si(3) is bonded in a trigonal planar geometry to one O(10), one O(3), and one O(6) atom. In the fourth Si site, Si(4) is bonded to one O(1), one O(11), one O(12), one O(5), and one O(8) atom to form SiO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  a cornercorner with one Ca(1)O5 trigonal bipyramid. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one Al(1), and one Si(4) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one Si(1), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Na(1), one Si(1), and one Si(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Ca(1), and one Al(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one Si(1), and one Si(4) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Na(1), one Mg(1), and one Si(3) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Mg(1), one Al(1), and one Si(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Ca(1), one Mg(1), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(1), one Ca(1), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaCaMgAl(SiO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.371
_cell_length_b   7.844
_cell_length_c   7.648
_cell_angle_alpha   90.000
_cell_angle_beta   106.746
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   538.311
_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
  Na  Na0  1  0.068  0.793  0.388  1.0
  Na  Na1  1  0.068  0.207  0.888  1.0
  Ca  Ca2  1  0.201  0.849  0.996  1.0
  Ca  Ca3  1  0.201  0.151  0.496  1.0
  Mg  Mg4  1  0.787  0.875  0.580  1.0
  Mg  Mg5  1  0.787  0.125  0.080  1.0
  Al  Al6  1  0.431  0.888  0.442  1.0
  Al  Al7  1  0.431  0.112  0.942  1.0
  Si  Si8  1  0.836  0.788  0.989  1.0
  Si  Si9  1  0.559  0.622  0.759  1.0
  Si  Si10  1  0.836  0.212  0.489  1.0
  Si  Si11  1  0.559  0.378  0.259  1.0
  Si  Si12  1  0.007  0.547  0.690  1.0
  Si  Si13  1  0.007  0.453  0.190  1.0
  Si  Si14  1  0.578  0.224  0.656  1.0
  Si  Si15  1  0.578  0.776  0.156  1.0
  O  O16  1  0.444  0.080  0.572  1.0
  O  O17  1  0.444  0.920  0.072  1.0
  O  O18  1  0.734  0.283  0.287  1.0
  O  O19  1  0.942  0.637  0.117  1.0
  O  O20  1  0.246  0.914  0.301  1.0
  O  O21  1  0.734  0.717  0.787  1.0
  O  O22  1  0.743  0.140  0.628  1.0
  O  O23  1  0.942  0.363  0.617  1.0
  O  O24  1  0.246  0.086  0.801  1.0
  O  O25  1  0.944  0.291  0.074  1.0
  O  O26  1  0.743  0.860  0.128  1.0
  O  O27  1  0.944  0.709  0.574  1.0
  O  O28  1  0.444  0.294  0.084  1.0
  O  O29  1  0.603  0.869  0.376  1.0
  O  O30  1  0.940  0.061  0.455  1.0
  O  O31  1  0.444  0.706  0.584  1.0
  O  O32  1  0.603  0.131  0.876  1.0
  O  O33  1  0.121  0.554  0.885  1.0
  O  O34  1  0.593  0.581  0.258  1.0
  O  O35  1  0.940  0.939  0.955  1.0
  O  O36  1  0.121  0.446  0.385  1.0
  O  O37  1  0.593  0.419  0.758  1.0
  O  O38  1  0.527  0.670  0.947  1.0
  O  O39  1  0.527  0.330  0.447  1.0
[/CIF]
.