The compound described by KNaMn(Si2O5)2 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 8-coordinate geometry to one O(10), one O(2), one O(3), one O(5), one O(7), one O(9), and two equivalent O(1) atoms. Na(1) is bonded in a 5-coordinate geometry to one O(10), one O(5), one O(6), and two equivalent O(8) atoms. Mn(1) is bonded to one O(10), one O(5), one O(8), and two equivalent O(6) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(10), one O(2), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the third Si site, Si(3) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the fourth Si site, Si(4) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Mn(1)O5 trigonal bipyramids. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one Si(3), and one Si(4) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one Si(1), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one Si(1), and one Si(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Si(2) and one Si(4) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Mn(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Mn(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one K(1), one Si(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Mn(1), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one K(1), one Si(2), and one Si(3) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Mn(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_KNaMn(Si2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.067
_cell_length_b   8.319
_cell_length_c   10.111
_cell_angle_alpha   105.751
_cell_angle_beta   99.607
_cell_angle_gamma   114.366
_symmetry_Int_Tables_number   1
_cell_volume   494.083
_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
  K  K0  1  0.158  0.799  0.990  1.0
  K  K1  1  0.842  0.201  0.010  1.0
  Na  Na2  1  0.836  0.862  0.589  1.0
  Na  Na3  1  0.164  0.138  0.411  1.0
  Mn  Mn4  1  0.658  0.106  0.407  1.0
  Mn  Mn5  1  0.342  0.894  0.593  1.0
  Si  Si6  1  0.293  0.177  0.868  1.0
  Si  Si7  1  0.464  0.300  0.211  1.0
  Si  Si8  1  0.063  0.364  0.730  1.0
  Si  Si9  1  0.937  0.636  0.270  1.0
  Si  Si10  1  0.536  0.700  0.789  1.0
  Si  Si11  1  0.707  0.823  0.132  1.0
  Si  Si12  1  0.371  0.638  0.269  1.0
  Si  Si13  1  0.629  0.362  0.731  1.0
  O  O14  1  0.110  0.576  0.207  1.0
  O  O15  1  0.877  0.738  0.162  1.0
  O  O16  1  0.535  0.325  0.866  1.0
  O  O17  1  0.625  0.552  0.716  1.0
  O  O18  1  0.578  0.857  0.719  1.0
  O  O19  1  0.498  0.176  0.583  1.0
  O  O20  1  0.375  0.448  0.284  1.0
  O  O21  1  0.323  0.187  0.036  1.0
  O  O22  1  0.968  0.226  0.564  1.0
  O  O23  1  0.890  0.424  0.793  1.0
  O  O24  1  0.723  0.427  0.228  1.0
  O  O25  1  0.123  0.262  0.838  1.0
  O  O26  1  0.677  0.813  0.964  1.0
  O  O27  1  0.502  0.824  0.417  1.0
  O  O28  1  0.803  0.038  0.242  1.0
  O  O29  1  0.197  0.962  0.758  1.0
  O  O30  1  0.465  0.675  0.134  1.0
  O  O31  1  0.032  0.774  0.436  1.0
  O  O32  1  0.277  0.573  0.772  1.0
  O  O33  1  0.422  0.143  0.281  1.0
[/CIF]
.
The compound described by KNaMn(Si2O5)2 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 8-coordinate geometry to one O(10), one O(2), one O(3), one O(5), one O(7), one O(9), and two equivalent O(1) atoms. Na(1) is bonded in a 5-coordinate geometry to one O(10), one O(5), one O(6), and two equivalent O(8) atoms. Mn(1) is bonded to one O(10), one O(5), one O(8), and two equivalent O(6) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(10), one O(2), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the third Si site, Si(3) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the fourth Si site, Si(4) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Mn(1)O5 trigonal bipyramids. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one Si(3), and one Si(4) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one Si(1), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one Si(1), and one Si(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Si(2) and one Si(4) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Mn(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Mn(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one K(1), one Si(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Mn(1), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one K(1), one Si(2), and one Si(3) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Mn(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_KNaMn(Si2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.067
_cell_length_b   8.319
_cell_length_c   10.111
_cell_angle_alpha   105.751
_cell_angle_beta   99.607
_cell_angle_gamma   114.366
_symmetry_Int_Tables_number   1
_cell_volume   494.083
_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
  K  K0  1  0.158  0.799  0.990  1.0
  K  K1  1  0.842  0.201  0.010  1.0
  Na  Na2  1  0.836  0.862  0.589  1.0
  Na  Na3  1  0.164  0.138  0.411  1.0
  Mn  Mn4  1  0.658  0.106  0.407  1.0
  Mn  Mn5  1  0.342  0.894  0.593  1.0
  Si  Si6  1  0.293  0.177  0.868  1.0
  Si  Si7  1  0.464  0.300  0.211  1.0
  Si  Si8  1  0.063  0.364  0.730  1.0
  Si  Si9  1  0.937  0.636  0.270  1.0
  Si  Si10  1  0.536  0.700  0.789  1.0
  Si  Si11  1  0.707  0.823  0.132  1.0
  Si  Si12  1  0.371  0.638  0.269  1.0
  Si  Si13  1  0.629  0.362  0.731  1.0
  O  O14  1  0.110  0.576  0.207  1.0
  O  O15  1  0.877  0.738  0.162  1.0
  O  O16  1  0.535  0.325  0.866  1.0
  O  O17  1  0.625  0.552  0.716  1.0
  O  O18  1  0.578  0.857  0.719  1.0
  O  O19  1  0.498  0.176  0.583  1.0
  O  O20  1  0.375  0.448  0.284  1.0
  O  O21  1  0.323  0.187  0.036  1.0
  O  O22  1  0.968  0.226  0.564  1.0
  O  O23  1  0.890  0.424  0.793  1.0
  O  O24  1  0.723  0.427  0.228  1.0
  O  O25  1  0.123  0.262  0.838  1.0
  O  O26  1  0.677  0.813  0.964  1.0
  O  O27  1  0.502  0.824  0.417  1.0
  O  O28  1  0.803  0.038  0.242  1.0
  O  O29  1  0.197  0.962  0.758  1.0
  O  O30  1  0.465  0.675  0.134  1.0
  O  O31  1  0.032  0.774  0.436  1.0
  O  O32  1  0.277  0.573  0.772  1.0
  O  O33  1  0.422  0.143  0.281  1.0
[/CIF]
.