The compound described by Na2MnInSi2O9 crystallizes in the orthorhombic Cmc2_1 space group. Na(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), and three equivalent O(4) atoms. Mn(1) is bonded to one O(5), two equivalent O(1), and two equivalent O(2) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one In(1)O6 pentagonal pyramid, corners with four equivalent Si(1)O4 tetrahedra, and  a faceface with one In(1)O6 pentagonal pyramid. In(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form distorted InO6 pentagonal pyramids that share corners with two equivalent In(1)O6 pentagonal pyramids, corners with four equivalent Si(1)O4 tetrahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid, and  a faceface with one Mn(1)O5 trigonal bipyramid. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with two equivalent In(1)O6 pentagonal pyramids and corners with two equivalent Mn(1)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one In(1), and one Si(1) atom. In the second O site, O(4) is bonded in a 4-coordinate geometry to three equivalent Na(1) and one Si(1) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to one Mn(1) and two equivalent In(1) atoms. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(1) and one Si(1) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Mn(1), one In(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2MnInSi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.960
_cell_length_b   8.960
_cell_length_c   7.299
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   131.050
_symmetry_Int_Tables_number   1
_cell_volume   441.893
_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  0.193  0.746  0.505  1.0
  Na  Na1  1  0.746  0.193  0.505  1.0
  Na  Na2  1  0.807  0.254  0.005  1.0
  Na  Na3  1  0.254  0.807  0.005  1.0
  Mn  Mn4  1  0.351  0.351  0.100  1.0
  Mn  Mn5  1  0.649  0.649  0.600  1.0
  In  In6  1  0.970  0.970  0.002  1.0
  In  In7  1  0.030  0.030  0.502  1.0
  Si  Si8  1  0.572  0.818  0.247  1.0
  Si  Si9  1  0.818  0.572  0.247  1.0
  Si  Si10  1  0.428  0.182  0.747  1.0
  Si  Si11  1  0.182  0.428  0.747  1.0
  O  O12  1  0.429  0.587  0.173  1.0
  O  O13  1  0.587  0.429  0.173  1.0
  O  O14  1  0.571  0.413  0.673  1.0
  O  O15  1  0.413  0.571  0.673  1.0
  O  O16  1  0.695  0.852  0.439  1.0
  O  O17  1  0.852  0.695  0.439  1.0
  O  O18  1  0.305  0.148  0.939  1.0
  O  O19  1  0.148  0.305  0.939  1.0
  O  O20  1  0.742  0.962  0.093  1.0
  O  O21  1  0.962  0.742  0.093  1.0
  O  O22  1  0.258  0.038  0.593  1.0
  O  O23  1  0.038  0.258  0.593  1.0
  O  O24  1  0.433  0.870  0.281  1.0
  O  O25  1  0.870  0.433  0.281  1.0
  O  O26  1  0.567  0.130  0.781  1.0
  O  O27  1  0.130  0.567  0.781  1.0
  O  O28  1  0.850  0.850  0.740  1.0
  O  O29  1  0.150  0.150  0.240  1.0
[/CIF]
.
The compound described by Na2MnInSi2O9 crystallizes in the orthorhombic Cmc2_1 space group. Na(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), and three equivalent O(4) atoms. Mn(1) is bonded to one O(5), two equivalent O(1), and two equivalent O(2) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one In(1)O6 pentagonal pyramid, corners with four equivalent Si(1)O4 tetrahedra, and  a faceface with one In(1)O6 pentagonal pyramid. In(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form distorted InO6 pentagonal pyramids that share corners with two equivalent In(1)O6 pentagonal pyramids, corners with four equivalent Si(1)O4 tetrahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid, and  a faceface with one Mn(1)O5 trigonal bipyramid. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with two equivalent In(1)O6 pentagonal pyramids and corners with two equivalent Mn(1)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one In(1), and one Si(1) atom. In the second O site, O(4) is bonded in a 4-coordinate geometry to three equivalent Na(1) and one Si(1) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to one Mn(1) and two equivalent In(1) atoms. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(1) and one Si(1) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Mn(1), one In(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2MnInSi2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.960
_cell_length_b   8.960
_cell_length_c   7.299
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   131.050
_symmetry_Int_Tables_number   1
_cell_volume   441.893
_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  0.193  0.746  0.505  1.0
  Na  Na1  1  0.746  0.193  0.505  1.0
  Na  Na2  1  0.807  0.254  0.005  1.0
  Na  Na3  1  0.254  0.807  0.005  1.0
  Mn  Mn4  1  0.351  0.351  0.100  1.0
  Mn  Mn5  1  0.649  0.649  0.600  1.0
  In  In6  1  0.970  0.970  0.002  1.0
  In  In7  1  0.030  0.030  0.502  1.0
  Si  Si8  1  0.572  0.818  0.247  1.0
  Si  Si9  1  0.818  0.572  0.247  1.0
  Si  Si10  1  0.428  0.182  0.747  1.0
  Si  Si11  1  0.182  0.428  0.747  1.0
  O  O12  1  0.429  0.587  0.173  1.0
  O  O13  1  0.587  0.429  0.173  1.0
  O  O14  1  0.571  0.413  0.673  1.0
  O  O15  1  0.413  0.571  0.673  1.0
  O  O16  1  0.695  0.852  0.439  1.0
  O  O17  1  0.852  0.695  0.439  1.0
  O  O18  1  0.305  0.148  0.939  1.0
  O  O19  1  0.148  0.305  0.939  1.0
  O  O20  1  0.742  0.962  0.093  1.0
  O  O21  1  0.962  0.742  0.093  1.0
  O  O22  1  0.258  0.038  0.593  1.0
  O  O23  1  0.038  0.258  0.593  1.0
  O  O24  1  0.433  0.870  0.281  1.0
  O  O25  1  0.870  0.433  0.281  1.0
  O  O26  1  0.567  0.130  0.781  1.0
  O  O27  1  0.130  0.567  0.781  1.0
  O  O28  1  0.850  0.850  0.740  1.0
  O  O29  1  0.150  0.150  0.240  1.0
[/CIF]
.