The structure described by Ca4MgAl2Si3O14 crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(14), one O(3), one O(4), one O(6), one O(7), and one O(8) atom. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(12), one O(13), one O(4), one O(5), one O(6), and one O(9) atom. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(14), one O(2), one O(3), one O(5), one O(6), and one O(9) atom. Mg(1) is bonded to one O(11), one O(13), one O(7), and one O(9) atom to form MgO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(12), one O(14), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(14), one O(2), one O(3), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(13), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(12), one O(2), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Al(2)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(10), one O(11), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Si(1), and one Si(3) atom. In the second O site, O(2) is bonded to one Ca(2), one Ca(4), one Al(2), and one Si(2) atom to form a mixture of distorted edge and corner-sharing OCa2AlSi tetrahedra. In the third O site, O(3) is bonded to one Ca(1), one Ca(2), one Ca(4), and one Al(2) atom to form a mixture of distorted edge and corner-sharing OCa3Al tetrahedra. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(3), one Ca(4), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Ca(4), and one Si(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Mg(1), and one Al(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Ca(2), one Al(1), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ca(3), one Ca(4), one Mg(1), and one Si(2) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Ca(3), one Ca(4), one Al(1), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(4), one Mg(1), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Ca(2), one Ca(3), one Al(1), and one Si(2) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(3), one Mg(1), and one Si(1) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(4), one Al(1), and one Al(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca4MgAl2Si3O14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.087
_cell_length_b   7.812
_cell_length_c   7.873
_cell_angle_alpha   90.104
_cell_angle_beta   90.042
_cell_angle_gamma   90.117
_symmetry_Int_Tables_number   1
_cell_volume   312.886
_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  0.488  0.329  0.821  1.0
  Ca  Ca1  1  0.506  0.176  0.360  1.0
  Ca  Ca2  1  0.488  0.658  0.168  1.0
  Ca  Ca3  1  0.510  0.846  0.665  1.0
  Mg  Mg4  1  0.000  0.501  0.500  1.0
  Al  Al5  1  0.007  1.000  0.000  1.0
  Al  Al6  1  0.050  0.140  0.643  1.0
  Si  Si7  1  0.944  0.356  0.140  1.0
  Si  Si8  1  0.058  0.858  0.354  1.0
  Si  Si9  1  0.944  0.645  0.861  1.0
  O  O10  1  0.822  0.498  0.997  1.0
  O  O11  1  0.185  0.994  0.493  1.0
  O  O12  1  0.709  0.134  0.641  1.0
  O  O13  1  0.261  0.360  0.143  1.0
  O  O14  1  0.740  0.855  0.354  1.0
  O  O15  1  0.261  0.646  0.863  1.0
  O  O16  1  0.223  0.325  0.586  1.0
  O  O17  1  0.810  0.172  0.080  1.0
  O  O18  1  0.210  0.680  0.400  1.0
  O  O19  1  0.805  0.826  0.926  1.0
  O  O20  1  0.791  0.598  0.685  1.0
  O  O21  1  0.194  0.917  0.171  1.0
  O  O22  1  0.787  0.411  0.313  1.0
  O  O23  1  0.206  0.075  0.835  1.0
[/CIF]
.
The structure described by Ca4MgAl2Si3O14 crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(14), one O(3), one O(4), one O(6), one O(7), and one O(8) atom. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(12), one O(13), one O(4), one O(5), one O(6), and one O(9) atom. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(14), one O(2), one O(3), one O(5), one O(6), and one O(9) atom. Mg(1) is bonded to one O(11), one O(13), one O(7), and one O(9) atom to form MgO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(12), one O(14), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(14), one O(2), one O(3), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(13), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(12), one O(2), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Al(2)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(10), one O(11), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Si(1)O4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Si(1), and one Si(3) atom. In the second O site, O(2) is bonded to one Ca(2), one Ca(4), one Al(2), and one Si(2) atom to form a mixture of distorted edge and corner-sharing OCa2AlSi tetrahedra. In the third O site, O(3) is bonded to one Ca(1), one Ca(2), one Ca(4), and one Al(2) atom to form a mixture of distorted edge and corner-sharing OCa3Al tetrahedra. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(3), one Ca(4), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Ca(4), and one Si(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Mg(1), and one Al(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Ca(2), one Al(1), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ca(3), one Ca(4), one Mg(1), and one Si(2) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Ca(3), one Ca(4), one Al(1), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(4), one Mg(1), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Ca(2), one Ca(3), one Al(1), and one Si(2) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(3), one Mg(1), and one Si(1) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(4), one Al(1), and one Al(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca4MgAl2Si3O14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.087
_cell_length_b   7.812
_cell_length_c   7.873
_cell_angle_alpha   90.104
_cell_angle_beta   90.042
_cell_angle_gamma   90.117
_symmetry_Int_Tables_number   1
_cell_volume   312.886
_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  0.488  0.329  0.821  1.0
  Ca  Ca1  1  0.506  0.176  0.360  1.0
  Ca  Ca2  1  0.488  0.658  0.168  1.0
  Ca  Ca3  1  0.510  0.846  0.665  1.0
  Mg  Mg4  1  0.000  0.501  0.500  1.0
  Al  Al5  1  0.007  1.000  0.000  1.0
  Al  Al6  1  0.050  0.140  0.643  1.0
  Si  Si7  1  0.944  0.356  0.140  1.0
  Si  Si8  1  0.058  0.858  0.354  1.0
  Si  Si9  1  0.944  0.645  0.861  1.0
  O  O10  1  0.822  0.498  0.997  1.0
  O  O11  1  0.185  0.994  0.493  1.0
  O  O12  1  0.709  0.134  0.641  1.0
  O  O13  1  0.261  0.360  0.143  1.0
  O  O14  1  0.740  0.855  0.354  1.0
  O  O15  1  0.261  0.646  0.863  1.0
  O  O16  1  0.223  0.325  0.586  1.0
  O  O17  1  0.810  0.172  0.080  1.0
  O  O18  1  0.210  0.680  0.400  1.0
  O  O19  1  0.805  0.826  0.926  1.0
  O  O20  1  0.791  0.598  0.685  1.0
  O  O21  1  0.194  0.917  0.171  1.0
  O  O22  1  0.787  0.411  0.313  1.0
  O  O23  1  0.206  0.075  0.835  1.0
[/CIF]
.