The material described by Ca2Mn3Si3O14 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(10), one O(6), two equivalent O(5), and two equivalent O(9) atoms to form distorted CaO7 pentagonal bipyramids that share corners with two equivalent Si(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one Si(3)O4 tetrahedra. In the second Ca site, Ca(2) is bonded to one O(11), one O(7), two equivalent O(5), and two equivalent O(8) atoms to form distorted CaO6 octahedra that share corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one Ca(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 58°. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(9) 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(1)O7 pentagonal bipyramids. In the second Mn site, Mn(2) is bonded to two equivalent O(5), 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, edges with two equivalent Ca(2)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Ca(1)O7 pentagonal bipyramids. In the third Mn site, Mn(3) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with two equivalent Ca(2)O6 octahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(11), and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with three equivalent Ca(2)O6 octahedra, corners with three equivalent Ca(1)O7 pentagonal bipyramids, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-65°. In the second Si site, Si(2) is bonded to one O(4), one O(7), and two equivalent O(9) atoms to form SiO4 tetrahedra that share  a cornercorner with one Ca(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and corners with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-68°. In the third Si site, Si(3) is bonded to one O(1), one O(10), and two equivalent O(8) atoms to form SiO4 tetrahedra that share corners with two equivalent Ca(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  an edgeedge with one Ca(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 49-63°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(1), one Si(1), and one Si(3) atom. In the second O site, O(2) is bonded in a water-like geometry to two equivalent Mn(1) atoms. In the third O site, O(3) is bonded in a water-like geometry to two equivalent Mn(3) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Mn(3) and one Si(2) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(2), one Mn(2), and one Si(1) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Ca(1) and two equivalent Mn(2) atoms. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), two equivalent Mn(2), and one Si(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Ca(2), one Mn(3), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ca(1), one Mn(1), and one Si(2) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Ca(1), two equivalent Mn(1), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Ca(2) and one Si(1) atom. is represented by the CIF card [CIF]
data_Ca2Mn3Si3O14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.049
_cell_length_b   8.670
_cell_length_c   10.435
_cell_angle_alpha   72.983
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   523.309
_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
  Ca  Ca0  1  0.250  0.332  0.812  1.0
  Ca  Ca1  1  0.750  0.668  0.188  1.0
  Ca  Ca2  1  0.250  0.239  0.179  1.0
  Ca  Ca3  1  0.750  0.761  0.821  1.0
  Mn  Mn4  1  0.500  0.500  0.500  1.0
  Mn  Mn5  1  0.000  0.500  0.500  1.0
  Mn  Mn6  1  0.500  0.000  0.000  1.0
  Mn  Mn7  1  0.000  0.000  0.000  1.0
  Mn  Mn8  1  0.500  0.000  0.500  1.0
  Mn  Mn9  1  0.000  0.000  0.500  1.0
  Si  Si10  1  0.250  0.666  0.997  1.0
  Si  Si11  1  0.750  0.334  0.003  1.0
  Si  Si12  1  0.250  0.806  0.307  1.0
  Si  Si13  1  0.750  0.194  0.693  1.0
  Si  Si14  1  0.250  0.716  0.690  1.0
  Si  Si15  1  0.750  0.284  0.310  1.0
  O  O16  1  0.250  0.616  0.851  1.0
  O  O17  1  0.750  0.384  0.149  1.0
  O  O18  1  0.250  0.407  0.441  1.0
  O  O19  1  0.750  0.593  0.559  1.0
  O  O20  1  0.250  0.099  0.558  1.0
  O  O21  1  0.750  0.901  0.442  1.0
  O  O22  1  0.250  0.916  0.418  1.0
  O  O23  1  0.750  0.084  0.582  1.0
  O  O24  1  0.481  0.770  0.997  1.0
  O  O25  1  0.519  0.230  0.003  1.0
  O  O26  1  0.981  0.230  0.003  1.0
  O  O27  1  0.019  0.770  0.997  1.0
  O  O28  1  0.250  0.056  0.889  1.0
  O  O29  1  0.750  0.944  0.111  1.0
  O  O30  1  0.250  0.945  0.157  1.0
  O  O31  1  0.750  0.055  0.843  1.0
  O  O32  1  0.475  0.823  0.659  1.0
  O  O33  1  0.525  0.177  0.341  1.0
  O  O34  1  0.975  0.177  0.341  1.0
  O  O35  1  0.025  0.823  0.659  1.0
  O  O36  1  0.471  0.694  0.337  1.0
  O  O37  1  0.529  0.306  0.663  1.0
  O  O38  1  0.971  0.306  0.663  1.0
  O  O39  1  0.029  0.694  0.337  1.0
  O  O40  1  0.250  0.575  0.612  1.0
  O  O41  1  0.750  0.425  0.388  1.0
  O  O42  1  0.250  0.502  0.117  1.0
  O  O43  1  0.750  0.498  0.883  1.0
[/CIF]
.
The material described by Ca2Mn3Si3O14 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(10), one O(6), two equivalent O(5), and two equivalent O(9) atoms to form distorted CaO7 pentagonal bipyramids that share corners with two equivalent Si(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one Si(3)O4 tetrahedra. In the second Ca site, Ca(2) is bonded to one O(11), one O(7), two equivalent O(5), and two equivalent O(8) atoms to form distorted CaO6 octahedra that share corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra, edges with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one Ca(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 58°. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(9) 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(1)O7 pentagonal bipyramids. In the second Mn site, Mn(2) is bonded to two equivalent O(5), 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, edges with two equivalent Ca(2)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Ca(1)O7 pentagonal bipyramids. In the third Mn site, Mn(3) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with two equivalent Ca(2)O6 octahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(11), and two equivalent O(5) atoms to form SiO4 tetrahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with three equivalent Ca(2)O6 octahedra, corners with three equivalent Ca(1)O7 pentagonal bipyramids, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-65°. In the second Si site, Si(2) is bonded to one O(4), one O(7), and two equivalent O(9) atoms to form SiO4 tetrahedra that share  a cornercorner with one Ca(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and corners with two equivalent Ca(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 50-68°. In the third Si site, Si(3) is bonded to one O(1), one O(10), and two equivalent O(8) atoms to form SiO4 tetrahedra that share corners with two equivalent Ca(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  an edgeedge with one Ca(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 49-63°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(1), one Si(1), and one Si(3) atom. In the second O site, O(2) is bonded in a water-like geometry to two equivalent Mn(1) atoms. In the third O site, O(3) is bonded in a water-like geometry to two equivalent Mn(3) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Mn(3) and one Si(2) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Ca(2), one Mn(2), and one Si(1) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Ca(1) and two equivalent Mn(2) atoms. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), two equivalent Mn(2), and one Si(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Ca(2), one Mn(3), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Ca(1), one Mn(1), and one Si(2) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Ca(1), two equivalent Mn(1), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Ca(2) and one Si(1) atom. is represented by the CIF card [CIF]
data_Ca2Mn3Si3O14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.049
_cell_length_b   8.670
_cell_length_c   10.435
_cell_angle_alpha   72.983
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   523.309
_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
  Ca  Ca0  1  0.250  0.332  0.812  1.0
  Ca  Ca1  1  0.750  0.668  0.188  1.0
  Ca  Ca2  1  0.250  0.239  0.179  1.0
  Ca  Ca3  1  0.750  0.761  0.821  1.0
  Mn  Mn4  1  0.500  0.500  0.500  1.0
  Mn  Mn5  1  0.000  0.500  0.500  1.0
  Mn  Mn6  1  0.500  0.000  0.000  1.0
  Mn  Mn7  1  0.000  0.000  0.000  1.0
  Mn  Mn8  1  0.500  0.000  0.500  1.0
  Mn  Mn9  1  0.000  0.000  0.500  1.0
  Si  Si10  1  0.250  0.666  0.997  1.0
  Si  Si11  1  0.750  0.334  0.003  1.0
  Si  Si12  1  0.250  0.806  0.307  1.0
  Si  Si13  1  0.750  0.194  0.693  1.0
  Si  Si14  1  0.250  0.716  0.690  1.0
  Si  Si15  1  0.750  0.284  0.310  1.0
  O  O16  1  0.250  0.616  0.851  1.0
  O  O17  1  0.750  0.384  0.149  1.0
  O  O18  1  0.250  0.407  0.441  1.0
  O  O19  1  0.750  0.593  0.559  1.0
  O  O20  1  0.250  0.099  0.558  1.0
  O  O21  1  0.750  0.901  0.442  1.0
  O  O22  1  0.250  0.916  0.418  1.0
  O  O23  1  0.750  0.084  0.582  1.0
  O  O24  1  0.481  0.770  0.997  1.0
  O  O25  1  0.519  0.230  0.003  1.0
  O  O26  1  0.981  0.230  0.003  1.0
  O  O27  1  0.019  0.770  0.997  1.0
  O  O28  1  0.250  0.056  0.889  1.0
  O  O29  1  0.750  0.944  0.111  1.0
  O  O30  1  0.250  0.945  0.157  1.0
  O  O31  1  0.750  0.055  0.843  1.0
  O  O32  1  0.475  0.823  0.659  1.0
  O  O33  1  0.525  0.177  0.341  1.0
  O  O34  1  0.975  0.177  0.341  1.0
  O  O35  1  0.025  0.823  0.659  1.0
  O  O36  1  0.471  0.694  0.337  1.0
  O  O37  1  0.529  0.306  0.663  1.0
  O  O38  1  0.971  0.306  0.663  1.0
  O  O39  1  0.029  0.694  0.337  1.0
  O  O40  1  0.250  0.575  0.612  1.0
  O  O41  1  0.750  0.425  0.388  1.0
  O  O42  1  0.250  0.502  0.117  1.0
  O  O43  1  0.750  0.498  0.883  1.0
[/CIF]
.