The structure described by Ca4Mn5Al(Si3O14)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(7), and one O(8) atom. In the second Ca site, Ca(2) is bonded to one O(1), one O(10), one O(12), one O(14), one O(2), one O(4), and one O(5) atom to form distorted CaO7 pentagonal bipyramids that share corners with two equivalent Si(2)O4 tetrahedra, corners with three equivalent Si(3)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(14), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Ca(2)O7 pentagonal bipyramids. In the second Mn site, Mn(2) is bonded to two equivalent O(14), two equivalent O(2), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Ca(2)O7 pentagonal bipyramids. In the third Mn site, Mn(3) is bonded to two equivalent O(12), two equivalent O(4), and two equivalent O(9) atoms to form MnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Ca(2)O7 pentagonal bipyramids. In the fourth Mn site, Mn(4) is bonded to two equivalent O(12), two equivalent O(5), and two equivalent O(9) atoms to form MnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Ca(2)O7 pentagonal bipyramids. In the fifth Mn site, Mn(5) is bonded to two equivalent O(13), two equivalent O(6), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. Al(1) is bonded to two equivalent O(13), two equivalent O(6), and two equivalent O(8) atoms to form AlO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Mn(5)O6 octahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(10), one O(12), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  an edgeedge with one Ca(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 44-59°. In the second Si site, Si(2) is bonded to one O(13), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra, and corners with two equivalent Ca(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-60°. In the third Si site, Si(3) is bonded to one O(1), one O(10), one O(11), and one O(2) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, corners with three equivalent Ca(2)O7 pentagonal bipyramids, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-54°. 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(2), one Mn(1), and one Si(3) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(2), one Mn(2), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Mn(1), one Mn(2), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ca(2), one Mn(3), and one Si(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ca(2), one Mn(4), and one Si(2) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one Mn(5) and one Al(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Ca(1), one Mn(5), and one Si(1) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Ca(1), one Al(1), and one Si(1) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one Mn(3) and one Mn(4) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(2), one Si(1), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Ca(1) and one Si(3) atom. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), one Mn(3), one Mn(4), and one Si(1) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Mn(5), one Al(1), and one Si(2) atom. In the fourteenth O site, O(14) is bonded in a trigonal non-coplanar geometry to one Ca(2), one Mn(1), and one Mn(2) atom. is represented by the CIF file [CIF]
data_Ca4Mn5Al(Si3O14)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.030
_cell_length_b   8.717
_cell_length_c   10.375
_cell_angle_alpha   107.372
_cell_angle_beta   91.650
_cell_angle_gamma   89.476
_symmetry_Int_Tables_number   1
_cell_volume   520.259
_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  0.247  0.763  0.682  1.0
  Ca  Ca1  1  0.753  0.237  0.318  1.0
  Ca  Ca2  1  0.253  0.665  0.312  1.0
  Ca  Ca3  1  0.747  0.335  0.688  1.0
  Mn  Mn4  1  0.500  0.000  0.500  1.0
  Mn  Mn5  1  0.000  0.000  0.500  1.0
  Mn  Mn6  1  0.500  0.500  0.000  1.0
  Mn  Mn7  1  0.000  0.500  0.000  1.0
  Mn  Mn8  1  0.500  0.000  0.000  1.0
  Al  Al9  1  0.000  0.000  0.000  1.0
  Si  Si10  1  0.238  0.282  0.186  1.0
  Si  Si11  1  0.762  0.718  0.814  1.0
  Si  Si12  1  0.247  0.195  0.809  1.0
  Si  Si13  1  0.753  0.805  0.191  1.0
  Si  Si14  1  0.251  0.334  0.496  1.0
  Si  Si15  1  0.749  0.666  0.504  1.0
  O  O16  1  0.482  0.229  0.494  1.0
  O  O17  1  0.980  0.774  0.505  1.0
  O  O18  1  0.518  0.771  0.506  1.0
  O  O19  1  0.020  0.226  0.495  1.0
  O  O20  1  0.226  0.056  0.656  1.0
  O  O21  1  0.774  0.944  0.344  1.0
  O  O22  1  0.467  0.308  0.831  1.0
  O  O23  1  0.972  0.689  0.158  1.0
  O  O24  1  0.533  0.692  0.169  1.0
  O  O25  1  0.028  0.311  0.842  1.0
  O  O26  1  0.258  0.908  0.063  1.0
  O  O27  1  0.742  0.092  0.937  1.0
  O  O28  1  0.473  0.184  0.156  1.0
  O  O29  1  0.977  0.833  0.845  1.0
  O  O30  1  0.527  0.816  0.844  1.0
  O  O31  1  0.023  0.167  0.155  1.0
  O  O32  1  0.246  0.592  0.944  1.0
  O  O33  1  0.754  0.408  0.056  1.0
  O  O34  1  0.244  0.383  0.349  1.0
  O  O35  1  0.756  0.617  0.651  1.0
  O  O36  1  0.248  0.498  0.616  1.0
  O  O37  1  0.752  0.502  0.384  1.0
  O  O38  1  0.225  0.425  0.111  1.0
  O  O39  1  0.775  0.575  0.889  1.0
  O  O40  1  0.250  0.084  0.915  1.0
  O  O41  1  0.750  0.916  0.085  1.0
  O  O42  1  0.243  0.942  0.388  1.0
  O  O43  1  0.757  0.058  0.612  1.0
[/CIF]
.
The structure described by Ca4Mn5Al(Si3O14)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(7), and one O(8) atom. In the second Ca site, Ca(2) is bonded to one O(1), one O(10), one O(12), one O(14), one O(2), one O(4), and one O(5) atom to form distorted CaO7 pentagonal bipyramids that share corners with two equivalent Si(2)O4 tetrahedra, corners with three equivalent Si(3)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra,  an edgeedge with one Mn(4)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(14), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Ca(2)O7 pentagonal bipyramids. In the second Mn site, Mn(2) is bonded to two equivalent O(14), two equivalent O(2), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Ca(2)O7 pentagonal bipyramids. In the third Mn site, Mn(3) is bonded to two equivalent O(12), two equivalent O(4), and two equivalent O(9) atoms to form MnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Ca(2)O7 pentagonal bipyramids. In the fourth Mn site, Mn(4) is bonded to two equivalent O(12), two equivalent O(5), and two equivalent O(9) atoms to form MnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Mn(3)O6 octahedra, and edges with two equivalent Ca(2)O7 pentagonal bipyramids. In the fifth Mn site, Mn(5) is bonded to two equivalent O(13), two equivalent O(6), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. Al(1) is bonded to two equivalent O(13), two equivalent O(6), and two equivalent O(8) atoms to form AlO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Mn(5)O6 octahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(10), one O(12), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  an edgeedge with one Ca(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 44-59°. In the second Si site, Si(2) is bonded to one O(13), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(4)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Al(1)O6 octahedra, and corners with two equivalent Ca(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 44-60°. In the third Si site, Si(3) is bonded to one O(1), one O(10), one O(11), and one O(2) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, corners with three equivalent Ca(2)O7 pentagonal bipyramids, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-54°. 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(2), one Mn(1), and one Si(3) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(2), one Mn(2), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Mn(1), one Mn(2), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Ca(2), one Mn(3), and one Si(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Ca(2), one Mn(4), and one Si(2) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one Mn(5) and one Al(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Ca(1), one Mn(5), and one Si(1) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Ca(1), one Al(1), and one Si(1) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one Mn(3) and one Mn(4) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(2), one Si(1), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Ca(1) and one Si(3) atom. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), one Mn(3), one Mn(4), and one Si(1) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Mn(5), one Al(1), and one Si(2) atom. In the fourteenth O site, O(14) is bonded in a trigonal non-coplanar geometry to one Ca(2), one Mn(1), and one Mn(2) atom. is represented by the CIF file [CIF]
data_Ca4Mn5Al(Si3O14)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.030
_cell_length_b   8.717
_cell_length_c   10.375
_cell_angle_alpha   107.372
_cell_angle_beta   91.650
_cell_angle_gamma   89.476
_symmetry_Int_Tables_number   1
_cell_volume   520.259
_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  0.247  0.763  0.682  1.0
  Ca  Ca1  1  0.753  0.237  0.318  1.0
  Ca  Ca2  1  0.253  0.665  0.312  1.0
  Ca  Ca3  1  0.747  0.335  0.688  1.0
  Mn  Mn4  1  0.500  0.000  0.500  1.0
  Mn  Mn5  1  0.000  0.000  0.500  1.0
  Mn  Mn6  1  0.500  0.500  0.000  1.0
  Mn  Mn7  1  0.000  0.500  0.000  1.0
  Mn  Mn8  1  0.500  0.000  0.000  1.0
  Al  Al9  1  0.000  0.000  0.000  1.0
  Si  Si10  1  0.238  0.282  0.186  1.0
  Si  Si11  1  0.762  0.718  0.814  1.0
  Si  Si12  1  0.247  0.195  0.809  1.0
  Si  Si13  1  0.753  0.805  0.191  1.0
  Si  Si14  1  0.251  0.334  0.496  1.0
  Si  Si15  1  0.749  0.666  0.504  1.0
  O  O16  1  0.482  0.229  0.494  1.0
  O  O17  1  0.980  0.774  0.505  1.0
  O  O18  1  0.518  0.771  0.506  1.0
  O  O19  1  0.020  0.226  0.495  1.0
  O  O20  1  0.226  0.056  0.656  1.0
  O  O21  1  0.774  0.944  0.344  1.0
  O  O22  1  0.467  0.308  0.831  1.0
  O  O23  1  0.972  0.689  0.158  1.0
  O  O24  1  0.533  0.692  0.169  1.0
  O  O25  1  0.028  0.311  0.842  1.0
  O  O26  1  0.258  0.908  0.063  1.0
  O  O27  1  0.742  0.092  0.937  1.0
  O  O28  1  0.473  0.184  0.156  1.0
  O  O29  1  0.977  0.833  0.845  1.0
  O  O30  1  0.527  0.816  0.844  1.0
  O  O31  1  0.023  0.167  0.155  1.0
  O  O32  1  0.246  0.592  0.944  1.0
  O  O33  1  0.754  0.408  0.056  1.0
  O  O34  1  0.244  0.383  0.349  1.0
  O  O35  1  0.756  0.617  0.651  1.0
  O  O36  1  0.248  0.498  0.616  1.0
  O  O37  1  0.752  0.502  0.384  1.0
  O  O38  1  0.225  0.425  0.111  1.0
  O  O39  1  0.775  0.575  0.889  1.0
  O  O40  1  0.250  0.084  0.915  1.0
  O  O41  1  0.750  0.916  0.085  1.0
  O  O42  1  0.243  0.942  0.388  1.0
  O  O43  1  0.757  0.058  0.612  1.0
[/CIF]
.