The structure described by SrMn2(SiO5)2 crystallizes in the orthorhombic Cmcm space group. Sr(1) is bonded in a 6-coordinate geometry to one O(2), one O(5), and four equivalent O(3) atoms. Mn(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Si(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. Si(1) is bonded to one O(4), one O(5), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-59°. There are five inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Mn(1) and one Si(1) atom. In the second O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sr(1) and two equivalent Si(1) atoms. In the third O site, O(1) is bonded in a water-like geometry to two equivalent Mn(1) atoms. In the fourth O site, O(2) is bonded in a single-bond geometry to one Sr(1) atom. In the fifth O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Mn(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrMn2(SiO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.395
_cell_length_b   5.395
_cell_length_c   13.546
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   112.078
_symmetry_Int_Tables_number   1
_cell_volume   365.374
_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
  Sr  Sr0  1  0.337  0.663  0.750  1.0
  Sr  Sr1  1  0.663  0.337  0.250  1.0
  Mn  Mn2  1  0.500  0.000  0.000  1.0
  Mn  Mn3  1  0.000  0.500  0.500  1.0
  Mn  Mn4  1  0.000  0.500  0.000  1.0
  Mn  Mn5  1  0.500  0.000  0.500  1.0
  Si  Si6  1  0.024  0.976  0.367  1.0
  Si  Si7  1  0.976  0.024  0.633  1.0
  Si  Si8  1  0.024  0.976  0.133  1.0
  Si  Si9  1  0.976  0.024  0.867  1.0
  O  O10  1  0.358  0.642  0.047  1.0
  O  O11  1  0.642  0.358  0.953  1.0
  O  O12  1  0.358  0.642  0.453  1.0
  O  O13  1  0.642  0.358  0.547  1.0
  O  O14  1  0.375  0.625  0.250  1.0
  O  O15  1  0.625  0.375  0.750  1.0
  O  O16  1  0.344  0.108  0.113  1.0
  O  O17  1  0.656  0.892  0.887  1.0
  O  O18  1  0.892  0.656  0.387  1.0
  O  O19  1  0.108  0.344  0.887  1.0
  O  O20  1  0.108  0.344  0.613  1.0
  O  O21  1  0.892  0.656  0.113  1.0
  O  O22  1  0.656  0.892  0.613  1.0
  O  O23  1  0.344  0.108  0.387  1.0
  O  O24  1  0.863  0.137  0.430  1.0
  O  O25  1  0.137  0.863  0.570  1.0
  O  O26  1  0.863  0.137  0.070  1.0
  O  O27  1  0.137  0.863  0.930  1.0
  O  O28  1  0.965  0.035  0.250  1.0
  O  O29  1  0.035  0.965  0.750  1.0
[/CIF]
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The structure described by SrMn2(SiO5)2 crystallizes in the orthorhombic Cmcm space group. Sr(1) is bonded in a 6-coordinate geometry to one O(2), one O(5), and four equivalent O(3) atoms. Mn(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Si(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. Si(1) is bonded to one O(4), one O(5), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-59°. There are five inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Mn(1) and one Si(1) atom. In the second O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sr(1) and two equivalent Si(1) atoms. In the third O site, O(1) is bonded in a water-like geometry to two equivalent Mn(1) atoms. In the fourth O site, O(2) is bonded in a single-bond geometry to one Sr(1) atom. In the fifth O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Mn(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrMn2(SiO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.395
_cell_length_b   5.395
_cell_length_c   13.546
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   112.078
_symmetry_Int_Tables_number   1
_cell_volume   365.374
_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
  Sr  Sr0  1  0.337  0.663  0.750  1.0
  Sr  Sr1  1  0.663  0.337  0.250  1.0
  Mn  Mn2  1  0.500  0.000  0.000  1.0
  Mn  Mn3  1  0.000  0.500  0.500  1.0
  Mn  Mn4  1  0.000  0.500  0.000  1.0
  Mn  Mn5  1  0.500  0.000  0.500  1.0
  Si  Si6  1  0.024  0.976  0.367  1.0
  Si  Si7  1  0.976  0.024  0.633  1.0
  Si  Si8  1  0.024  0.976  0.133  1.0
  Si  Si9  1  0.976  0.024  0.867  1.0
  O  O10  1  0.358  0.642  0.047  1.0
  O  O11  1  0.642  0.358  0.953  1.0
  O  O12  1  0.358  0.642  0.453  1.0
  O  O13  1  0.642  0.358  0.547  1.0
  O  O14  1  0.375  0.625  0.250  1.0
  O  O15  1  0.625  0.375  0.750  1.0
  O  O16  1  0.344  0.108  0.113  1.0
  O  O17  1  0.656  0.892  0.887  1.0
  O  O18  1  0.892  0.656  0.387  1.0
  O  O19  1  0.108  0.344  0.887  1.0
  O  O20  1  0.108  0.344  0.613  1.0
  O  O21  1  0.892  0.656  0.113  1.0
  O  O22  1  0.656  0.892  0.613  1.0
  O  O23  1  0.344  0.108  0.387  1.0
  O  O24  1  0.863  0.137  0.430  1.0
  O  O25  1  0.137  0.863  0.570  1.0
  O  O26  1  0.863  0.137  0.070  1.0
  O  O27  1  0.137  0.863  0.930  1.0
  O  O28  1  0.965  0.035  0.250  1.0
  O  O29  1  0.035  0.965  0.750  1.0
[/CIF]
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