The structure described by Li2Mn(SiO3)2 crystallizes in the monoclinic Cc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form distorted LiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Mn(1)O4 tetrahedra, and  an edgeedge with one Si(2)O4 tetrahedra. In the second Li site, Li(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. Mn(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MnO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with four equivalent Li(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Mn(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(1) atom to form corner-sharing OLi2MnSi tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one Mn(1), and one Si(1) atom. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(2) atom to form distorted corner-sharing OLi2MnSi tetrahedra. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to one Li(1), one Li(2), one Mn(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(2), one Si(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. is represented by the CIF file [CIF]
data_Li2Mn(SiO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.768
_cell_length_b   5.768
_cell_length_c   9.294
_cell_angle_alpha   90.033
_cell_angle_beta   90.035
_cell_angle_gamma   118.429
_symmetry_Int_Tables_number   1
_cell_volume   271.943
_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
  Li  Li0  1  0.532  0.354  0.103  1.0
  Li  Li1  1  0.354  0.532  0.603  1.0
  Li  Li2  1  0.733  0.385  0.368  1.0
  Li  Li3  1  0.385  0.733  0.868  1.0
  Mn  Mn4  1  0.759  0.266  0.744  1.0
  Mn  Mn5  1  0.266  0.759  0.244  1.0
  O  O6  1  0.362  0.157  0.282  1.0
  O  O7  1  0.157  0.362  0.782  1.0
  O  O8  1  0.490  0.209  0.908  1.0
  O  O9  1  0.209  0.490  0.408  1.0
  O  O10  1  0.724  0.497  0.581  1.0
  O  O11  1  0.497  0.724  0.081  1.0
  O  O12  1  0.872  0.635  0.189  1.0
  O  O13  1  0.635  0.872  0.689  1.0
  O  O14  1  0.074  0.850  0.770  1.0
  O  O15  1  0.850  0.074  0.270  1.0
  O  O16  1  0.056  0.006  0.511  1.0
  O  O17  1  0.006  0.056  0.011  1.0
  Si  Si18  1  0.189  0.130  0.866  1.0
  Si  Si19  1  0.130  0.189  0.366  1.0
  Si  Si20  1  0.865  0.804  0.634  1.0
  Si  Si21  1  0.804  0.865  0.134  1.0
[/CIF]
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The structure described by Li2Mn(SiO3)2 crystallizes in the monoclinic Cc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form distorted LiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Mn(1)O4 tetrahedra, and  an edgeedge with one Si(2)O4 tetrahedra. In the second Li site, Li(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. Mn(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MnO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with four equivalent Li(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Mn(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(1) atom to form corner-sharing OLi2MnSi tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one Mn(1), and one Si(1) atom. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Mn(1), and one Si(2) atom to form distorted corner-sharing OLi2MnSi tetrahedra. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to one Li(1), one Li(2), one Mn(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(2), one Si(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. is represented by the CIF file [CIF]
data_Li2Mn(SiO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.768
_cell_length_b   5.768
_cell_length_c   9.294
_cell_angle_alpha   90.033
_cell_angle_beta   90.035
_cell_angle_gamma   118.429
_symmetry_Int_Tables_number   1
_cell_volume   271.943
_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
  Li  Li0  1  0.532  0.354  0.103  1.0
  Li  Li1  1  0.354  0.532  0.603  1.0
  Li  Li2  1  0.733  0.385  0.368  1.0
  Li  Li3  1  0.385  0.733  0.868  1.0
  Mn  Mn4  1  0.759  0.266  0.744  1.0
  Mn  Mn5  1  0.266  0.759  0.244  1.0
  O  O6  1  0.362  0.157  0.282  1.0
  O  O7  1  0.157  0.362  0.782  1.0
  O  O8  1  0.490  0.209  0.908  1.0
  O  O9  1  0.209  0.490  0.408  1.0
  O  O10  1  0.724  0.497  0.581  1.0
  O  O11  1  0.497  0.724  0.081  1.0
  O  O12  1  0.872  0.635  0.189  1.0
  O  O13  1  0.635  0.872  0.689  1.0
  O  O14  1  0.074  0.850  0.770  1.0
  O  O15  1  0.850  0.074  0.270  1.0
  O  O16  1  0.056  0.006  0.511  1.0
  O  O17  1  0.006  0.056  0.011  1.0
  Si  Si18  1  0.189  0.130  0.866  1.0
  Si  Si19  1  0.130  0.189  0.366  1.0
  Si  Si20  1  0.865  0.804  0.634  1.0
  Si  Si21  1  0.804  0.865  0.134  1.0
[/CIF]
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