The compound described by Li4MnSn2Se7 is Stannite-like structured and crystallizes in the monoclinic Cc space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one Se(2), one Se(3), one Se(5), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(2)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with two equivalent Li(3)Se4 tetrahedra, corners with two equivalent Li(4)Se4 tetrahedra, corners with three equivalent Mn(1)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. In the second Li site, Li(2) is bonded to one Se(1), one Se(4), one Se(6), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(1)Se4 tetrahedra,  a cornercorner with one Mn(1)Se4 tetrahedra, corners with two equivalent Li(4)Se4 tetrahedra, corners with two equivalent Sn(2)Se4 tetrahedra, corners with three equivalent Li(3)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. In the third Li site, Li(3) is bonded to one Se(1), one Se(2), one Se(4), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(4)Se4 tetrahedra,  a cornercorner with one Mn(1)Se4 tetrahedra, corners with two equivalent Li(1)Se4 tetrahedra, corners with two equivalent Sn(1)Se4 tetrahedra, corners with three equivalent Li(2)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. In the fourth Li site, Li(4) is bonded to one Se(3), one Se(4), one Se(5), and one Se(6) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(3)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with two equivalent Li(1)Se4 tetrahedra, corners with two equivalent Li(2)Se4 tetrahedra, corners with three equivalent Mn(1)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. Mn(1) is bonded to one Se(2), one Se(3), one Se(5), and one Se(6) atom to form MnSe4 tetrahedra that share  a cornercorner with one Li(2)Se4 tetrahedra,  a cornercorner with one Li(3)Se4 tetrahedra, corners with two equivalent Sn(1)Se4 tetrahedra, corners with two equivalent Sn(2)Se4 tetrahedra, corners with three equivalent Li(1)Se4 tetrahedra, and corners with three equivalent Li(4)Se4 tetrahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Se(1), one Se(4), one Se(5), and one Se(6) atom to form SnSe4 tetrahedra that share  a cornercorner with one Li(1)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with two equivalent Li(3)Se4 tetrahedra, corners with two equivalent Mn(1)Se4 tetrahedra, corners with three equivalent Li(2)Se4 tetrahedra, and corners with three equivalent Li(4)Se4 tetrahedra. In the second Sn site, Sn(2) is bonded to one Se(1), one Se(2), one Se(3), and one Se(7) atom to form SnSe4 tetrahedra that share  a cornercorner with one Li(4)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with two equivalent Li(2)Se4 tetrahedra, corners with two equivalent Mn(1)Se4 tetrahedra, corners with three equivalent Li(1)Se4 tetrahedra, and corners with three equivalent Li(3)Se4 tetrahedra. There are seven inequivalent Se sites. In the first Se site, Se(3) is bonded to one Li(1), one Li(4), one Mn(1), and one Sn(2) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(1)Li2Sn2 tetrahedra,  a cornercorner with one Se(4)Li3Sn tetrahedra, corners with two equivalent Se(6)Li2MnSn tetrahedra, corners with two equivalent Se(7)Li3Sn tetrahedra, corners with three equivalent Se(2)Li2MnSn tetrahedra, and corners with three equivalent Se(5)Li2MnSn tetrahedra. In the second Se site, Se(4) is bonded to one Li(2), one Li(3), one Li(4), and one Sn(1) atom to form SeLi3Sn tetrahedra that share  a cornercorner with one Se(2)Li2MnSn tetrahedra,  a cornercorner with one Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(7)Li3Sn tetrahedra, corners with three equivalent Se(6)Li2MnSn tetrahedra, and corners with three equivalent Se(1)Li2Sn2 tetrahedra. In the third Se site, Se(5) is bonded to one Li(1), one Li(4), one Mn(1), and one Sn(1) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(1)Li2Sn2 tetrahedra,  a cornercorner with one Se(7)Li3Sn tetrahedra, corners with two equivalent Se(2)Li2MnSn tetrahedra, corners with two equivalent Se(4)Li3Sn tetrahedra, corners with three equivalent Se(3)Li2MnSn tetrahedra, and corners with three equivalent Se(6)Li2MnSn tetrahedra. In the fourth Se site, Se(6) is bonded to one Li(2), one Li(4), one Mn(1), and one Sn(1) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(2)Li2MnSn tetrahedra,  a cornercorner with one Se(7)Li3Sn tetrahedra, corners with two equivalent Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(1)Li2Sn2 tetrahedra, corners with three equivalent Se(5)Li2MnSn tetrahedra, and corners with three equivalent Se(4)Li3Sn tetrahedra. In the fifth Se site, Se(7) is bonded to one Li(1), one Li(2), one Li(3), and one Sn(2) atom to form SeLi3Sn tetrahedra that share  a cornercorner with one Se(5)Li2MnSn tetrahedra,  a cornercorner with one Se(6)Li2MnSn tetrahedra, corners with two equivalent Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(4)Li3Sn tetrahedra, corners with three equivalent Se(2)Li2MnSn tetrahedra, and corners with three equivalent Se(1)Li2Sn2 tetrahedra. In the sixth Se site, Se(1) is bonded to one Li(2), one Li(3), one Sn(1), and one Sn(2) atom to form SeLi2Sn2 tetrahedra that share  a cornercorner with one Se(3)Li2MnSn tetrahedra,  a cornercorner with one Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(2)Li2MnSn tetrahedra, corners with two equivalent Se(6)Li2MnSn tetrahedra, corners with three equivalent Se(4)Li3Sn tetrahedra, and corners with three equivalent Se(7)Li3Sn tetrahedra. In the seventh Se site, Se(2) is bonded to one Li(1), one Li(3), one Mn(1), and one Sn(2) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(6)Li2MnSn tetrahedra,  a cornercorner with one Se(4)Li3Sn tetrahedra, corners with two equivalent Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(1)Li2Sn2 tetrahedra, corners with three equivalent Se(3)Li2MnSn tetrahedra, and corners with three equivalent Se(7)Li3Sn tetrahedra. is represented by the CIF file [CIF]
data_Li4MnSn2Se7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.909
_cell_length_b   9.909
_cell_length_c   10.875
_cell_angle_alpha   86.988
_cell_angle_beta   86.988
_cell_angle_gamma   43.532
_symmetry_Int_Tables_number   1
_cell_volume   734.267
_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  0.527  0.181  0.412  1.0
  Li  Li1  1  0.181  0.527  0.912  1.0
  Li  Li2  1  0.916  0.217  0.336  1.0
  Li  Li3  1  0.217  0.916  0.836  1.0
  Li  Li4  1  0.682  0.310  0.698  1.0
  Li  Li5  1  0.310  0.682  0.198  1.0
  Li  Li6  1  0.041  0.384  0.615  1.0
  Li  Li7  1  0.384  0.041  0.115  1.0
  Mn  Mn8  1  0.930  0.636  0.259  1.0
  Mn  Mn9  1  0.636  0.930  0.759  1.0
  Sn  Sn10  1  0.472  0.810  0.470  1.0
  Sn  Sn11  1  0.810  0.472  0.970  1.0
  Sn  Sn12  1  0.079  0.768  0.538  1.0
  Sn  Sn13  1  0.768  0.079  0.038  1.0
  Se  Se14  1  0.369  0.691  0.636  1.0
  Se  Se15  1  0.691  0.369  0.136  1.0
  Se  Se16  1  0.219  0.550  0.350  1.0
  Se  Se17  1  0.550  0.219  0.850  1.0
  Se  Se18  1  0.998  0.645  0.709  1.0
  Se  Se19  1  0.645  0.998  0.209  1.0
  Se  Se20  1  0.274  0.941  0.278  1.0
  Se  Se21  1  0.941  0.274  0.778  1.0
  Se  Se22  1  0.416  0.075  0.573  1.0
  Se  Se23  1  0.075  0.416  0.073  1.0
  Se  Se24  1  0.836  0.514  0.417  1.0
  Se  Se25  1  0.514  0.836  0.917  1.0
  Se  Se26  1  0.795  0.131  0.498  1.0
  Se  Se27  1  0.131  0.795  0.998  1.0
[/CIF]
.
The compound described by Li4MnSn2Se7 is Stannite-like structured and crystallizes in the monoclinic Cc space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one Se(2), one Se(3), one Se(5), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(2)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with two equivalent Li(3)Se4 tetrahedra, corners with two equivalent Li(4)Se4 tetrahedra, corners with three equivalent Mn(1)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. In the second Li site, Li(2) is bonded to one Se(1), one Se(4), one Se(6), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(1)Se4 tetrahedra,  a cornercorner with one Mn(1)Se4 tetrahedra, corners with two equivalent Li(4)Se4 tetrahedra, corners with two equivalent Sn(2)Se4 tetrahedra, corners with three equivalent Li(3)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. In the third Li site, Li(3) is bonded to one Se(1), one Se(2), one Se(4), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(4)Se4 tetrahedra,  a cornercorner with one Mn(1)Se4 tetrahedra, corners with two equivalent Li(1)Se4 tetrahedra, corners with two equivalent Sn(1)Se4 tetrahedra, corners with three equivalent Li(2)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. In the fourth Li site, Li(4) is bonded to one Se(3), one Se(4), one Se(5), and one Se(6) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(3)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with two equivalent Li(1)Se4 tetrahedra, corners with two equivalent Li(2)Se4 tetrahedra, corners with three equivalent Mn(1)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. Mn(1) is bonded to one Se(2), one Se(3), one Se(5), and one Se(6) atom to form MnSe4 tetrahedra that share  a cornercorner with one Li(2)Se4 tetrahedra,  a cornercorner with one Li(3)Se4 tetrahedra, corners with two equivalent Sn(1)Se4 tetrahedra, corners with two equivalent Sn(2)Se4 tetrahedra, corners with three equivalent Li(1)Se4 tetrahedra, and corners with three equivalent Li(4)Se4 tetrahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Se(1), one Se(4), one Se(5), and one Se(6) atom to form SnSe4 tetrahedra that share  a cornercorner with one Li(1)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with two equivalent Li(3)Se4 tetrahedra, corners with two equivalent Mn(1)Se4 tetrahedra, corners with three equivalent Li(2)Se4 tetrahedra, and corners with three equivalent Li(4)Se4 tetrahedra. In the second Sn site, Sn(2) is bonded to one Se(1), one Se(2), one Se(3), and one Se(7) atom to form SnSe4 tetrahedra that share  a cornercorner with one Li(4)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with two equivalent Li(2)Se4 tetrahedra, corners with two equivalent Mn(1)Se4 tetrahedra, corners with three equivalent Li(1)Se4 tetrahedra, and corners with three equivalent Li(3)Se4 tetrahedra. There are seven inequivalent Se sites. In the first Se site, Se(3) is bonded to one Li(1), one Li(4), one Mn(1), and one Sn(2) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(1)Li2Sn2 tetrahedra,  a cornercorner with one Se(4)Li3Sn tetrahedra, corners with two equivalent Se(6)Li2MnSn tetrahedra, corners with two equivalent Se(7)Li3Sn tetrahedra, corners with three equivalent Se(2)Li2MnSn tetrahedra, and corners with three equivalent Se(5)Li2MnSn tetrahedra. In the second Se site, Se(4) is bonded to one Li(2), one Li(3), one Li(4), and one Sn(1) atom to form SeLi3Sn tetrahedra that share  a cornercorner with one Se(2)Li2MnSn tetrahedra,  a cornercorner with one Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(7)Li3Sn tetrahedra, corners with three equivalent Se(6)Li2MnSn tetrahedra, and corners with three equivalent Se(1)Li2Sn2 tetrahedra. In the third Se site, Se(5) is bonded to one Li(1), one Li(4), one Mn(1), and one Sn(1) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(1)Li2Sn2 tetrahedra,  a cornercorner with one Se(7)Li3Sn tetrahedra, corners with two equivalent Se(2)Li2MnSn tetrahedra, corners with two equivalent Se(4)Li3Sn tetrahedra, corners with three equivalent Se(3)Li2MnSn tetrahedra, and corners with three equivalent Se(6)Li2MnSn tetrahedra. In the fourth Se site, Se(6) is bonded to one Li(2), one Li(4), one Mn(1), and one Sn(1) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(2)Li2MnSn tetrahedra,  a cornercorner with one Se(7)Li3Sn tetrahedra, corners with two equivalent Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(1)Li2Sn2 tetrahedra, corners with three equivalent Se(5)Li2MnSn tetrahedra, and corners with three equivalent Se(4)Li3Sn tetrahedra. In the fifth Se site, Se(7) is bonded to one Li(1), one Li(2), one Li(3), and one Sn(2) atom to form SeLi3Sn tetrahedra that share  a cornercorner with one Se(5)Li2MnSn tetrahedra,  a cornercorner with one Se(6)Li2MnSn tetrahedra, corners with two equivalent Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(4)Li3Sn tetrahedra, corners with three equivalent Se(2)Li2MnSn tetrahedra, and corners with three equivalent Se(1)Li2Sn2 tetrahedra. In the sixth Se site, Se(1) is bonded to one Li(2), one Li(3), one Sn(1), and one Sn(2) atom to form SeLi2Sn2 tetrahedra that share  a cornercorner with one Se(3)Li2MnSn tetrahedra,  a cornercorner with one Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(2)Li2MnSn tetrahedra, corners with two equivalent Se(6)Li2MnSn tetrahedra, corners with three equivalent Se(4)Li3Sn tetrahedra, and corners with three equivalent Se(7)Li3Sn tetrahedra. In the seventh Se site, Se(2) is bonded to one Li(1), one Li(3), one Mn(1), and one Sn(2) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(6)Li2MnSn tetrahedra,  a cornercorner with one Se(4)Li3Sn tetrahedra, corners with two equivalent Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(1)Li2Sn2 tetrahedra, corners with three equivalent Se(3)Li2MnSn tetrahedra, and corners with three equivalent Se(7)Li3Sn tetrahedra. is represented by the CIF file [CIF]
data_Li4MnSn2Se7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.909
_cell_length_b   9.909
_cell_length_c   10.875
_cell_angle_alpha   86.988
_cell_angle_beta   86.988
_cell_angle_gamma   43.532
_symmetry_Int_Tables_number   1
_cell_volume   734.267
_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  0.527  0.181  0.412  1.0
  Li  Li1  1  0.181  0.527  0.912  1.0
  Li  Li2  1  0.916  0.217  0.336  1.0
  Li  Li3  1  0.217  0.916  0.836  1.0
  Li  Li4  1  0.682  0.310  0.698  1.0
  Li  Li5  1  0.310  0.682  0.198  1.0
  Li  Li6  1  0.041  0.384  0.615  1.0
  Li  Li7  1  0.384  0.041  0.115  1.0
  Mn  Mn8  1  0.930  0.636  0.259  1.0
  Mn  Mn9  1  0.636  0.930  0.759  1.0
  Sn  Sn10  1  0.472  0.810  0.470  1.0
  Sn  Sn11  1  0.810  0.472  0.970  1.0
  Sn  Sn12  1  0.079  0.768  0.538  1.0
  Sn  Sn13  1  0.768  0.079  0.038  1.0
  Se  Se14  1  0.369  0.691  0.636  1.0
  Se  Se15  1  0.691  0.369  0.136  1.0
  Se  Se16  1  0.219  0.550  0.350  1.0
  Se  Se17  1  0.550  0.219  0.850  1.0
  Se  Se18  1  0.998  0.645  0.709  1.0
  Se  Se19  1  0.645  0.998  0.209  1.0
  Se  Se20  1  0.274  0.941  0.278  1.0
  Se  Se21  1  0.941  0.274  0.778  1.0
  Se  Se22  1  0.416  0.075  0.573  1.0
  Se  Se23  1  0.075  0.416  0.073  1.0
  Se  Se24  1  0.836  0.514  0.417  1.0
  Se  Se25  1  0.514  0.836  0.917  1.0
  Se  Se26  1  0.795  0.131  0.498  1.0
  Se  Se27  1  0.131  0.795  0.998  1.0
[/CIF]
.