The material structure described by Mg7Mn5O12 is Caswellsilverite-like structured and crystallizes in the trigonal P3m1 space group. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to three equivalent O(2) and three equivalent O(3) atoms to form MgO6 octahedra that share corners with three equivalent Mn(2)O6 octahedra, corners with three equivalent Mn(3)O6 octahedra, edges with three equivalent Mn(2)O6 octahedra, edges with three equivalent Mn(3)O6 octahedra, and edges with six equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 3°. In the second Mg site, Mg(2) is bonded to three equivalent O(5) and three equivalent O(6) atoms to form MgO6 octahedra that share corners with three equivalent Mn(4)O6 octahedra, corners with three equivalent Mn(5)O6 octahedra, edges with three equivalent Mn(4)O6 octahedra, edges with three equivalent Mn(5)O6 octahedra, and edges with six equivalent Mg(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-4°. In the third Mg site, Mg(3) is bonded to three equivalent O(8) and three equivalent O(9) atoms to form a mixture of corner and edge-sharing MgO6 octahedra. The corner-sharing octahedra are not tilted. In the fourth Mg site, Mg(4) is bonded to three equivalent O(7) and three equivalent O(8) atoms to form MgO6 octahedra that share corners with three equivalent Mg(3)O6 octahedra, corners with three equivalent Mn(5)O6 octahedra, edges with three equivalent Mg(3)O6 octahedra, edges with three equivalent Mn(5)O6 octahedra, and edges with six equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fifth Mg site, Mg(5) is bonded to three equivalent O(10) and three equivalent O(9) atoms to form a mixture of corner and edge-sharing MgO6 octahedra. The corner-sharing octahedra are not tilted. In the sixth Mg site, Mg(6) is bonded to three equivalent O(11) and three equivalent O(12) atoms to form MgO6 octahedra that share corners with three equivalent Mg(7)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra, edges with three equivalent Mg(7)O6 octahedra, edges with three equivalent Mn(1)O6 octahedra, and edges with six equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the seventh Mg site, Mg(7) is bonded to three equivalent O(10) and three equivalent O(11) atoms to form a mixture of corner and edge-sharing MgO6 octahedra. The corner-sharing octahedra are not tilted. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent O(1) and three equivalent O(12) atoms to form MnO6 octahedra that share corners with three equivalent Mg(6)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, edges with three equivalent Mg(6)O6 octahedra, edges with three equivalent Mn(2)O6 octahedra, and edges with six equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second Mn site, Mn(2) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Mg(1)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mn(1)O6 octahedra, and edges with six equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third Mn site, Mn(3) is bonded to three equivalent O(3) and three equivalent O(4) atoms to form MnO6 octahedra that share corners with three equivalent Mg(1)O6 octahedra, corners with three equivalent Mn(4)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mn(4)O6 octahedra, and edges with six equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fourth Mn site, Mn(4) is bonded to three equivalent O(4) and three equivalent O(5) atoms to form MnO6 octahedra that share corners with three equivalent Mg(2)O6 octahedra, corners with three equivalent Mn(3)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Mn(3)O6 octahedra, and edges with six equivalent Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fifth Mn site, Mn(5) is bonded to three equivalent O(6) and three equivalent O(7) atoms to form MnO6 octahedra that share corners with three equivalent Mg(2)O6 octahedra, corners with three equivalent Mg(4)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Mg(4)O6 octahedra, and edges with six equivalent Mn(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-4°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Mn(1) and three equivalent Mn(2) atoms to form OMn6 octahedra that share corners with three equivalent O(12)Mg3Mn3 octahedra, corners with three equivalent O(2)Mg3Mn3 octahedra, edges with three equivalent O(12)Mg3Mn3 octahedra, edges with three equivalent O(2)Mg3Mn3 octahedra, and edges with six equivalent O(1)Mn6 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded to three equivalent Mg(1) and three equivalent Mn(2) atoms to form OMg3Mn3 octahedra that share corners with three equivalent O(3)Mg3Mn3 octahedra, corners with three equivalent O(1)Mn6 octahedra, edges with three equivalent O(3)Mg3Mn3 octahedra, edges with three equivalent O(1)Mn6 octahedra, and edges with six equivalent O(2)Mg3Mn3 octahedra. The corner-sharing octahedra are not tilted. In the third O site, O(3) is bonded to three equivalent Mg(1) and three equivalent Mn(3) atoms to form OMg3Mn3 octahedra that share corners with three equivalent O(2)Mg3Mn3 octahedra, corners with three equivalent O(4)Mn6 octahedra, edges with three equivalent O(2)Mg3Mn3 octahedra, edges with three equivalent O(4)Mn6 octahedra, and edges with six equivalent O(3)Mg3Mn3 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(4) is bonded to three equivalent Mn(3) and three equivalent Mn(4) atoms to form OMn6 octahedra that share corners with three equivalent O(3)Mg3Mn3 octahedra, corners with three equivalent O(5)Mg3Mn3 octahedra, edges with three equivalent O(3)Mg3Mn3 octahedra, edges with three equivalent O(5)Mg3Mn3 octahedra, and edges with six equivalent O(4)Mn6 octahedra. The corner-sharing octahedra are not tilted. In the fifth O site, O(5) is bonded to three equivalent Mg(2) and three equivalent Mn(4) atoms to form OMg3Mn3 octahedra that share corners with three equivalent O(6)Mg3Mn3 octahedra, corners with three equivalent O(4)Mn6 octahedra, edges with three equivalent O(6)Mg3Mn3 octahedra, edges with three equivalent O(4)Mn6 octahedra, and edges with six equivalent O(5)Mg3Mn3 octahedra. The corner-sharing octahedra are not tilted. In the sixth O site, O(6) is bonded to three equivalent Mg(2) and three equivalent Mn(5) atoms to form a mixture of corner and edge-sharing OMg3Mn3 octahedra. The corner-sharing octahedra are not tilted. In the seventh O site, O(7) is bonded to three equivalent Mg(4) and three equivalent Mn(5) atoms to form OMg3Mn3 octahedra that share corners with three equivalent O(6)Mg3Mn3 octahedra, corners with three equivalent O(8)Mg6 octahedra, edges with three equivalent O(6)Mg3Mn3 octahedra, edges with three equivalent O(8)Mg6 octahedra, and edges with six equivalent O(7)Mg3Mn3 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the eighth O site, O(8) is bonded to three equivalent Mg(3) and three equivalent Mg(4) atoms to form OMg6 octahedra that share corners with three equivalent O(7)Mg3Mn3 octahedra, corners with three equivalent O(9)Mg6 octahedra, edges with three equivalent O(7)Mg3Mn3 octahedra, edges with three equivalent O(9)Mg6 octahedra, and edges with six equivalent O(8)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the ninth O site, O(9) is bonded to three equivalent Mg(3) and three equivalent Mg(5) atoms to form a mixture of corner and edge-sharing OMg6 octahedra. The corner-sharing octahedra are not tilted. In the tenth O site, O(10) is bonded to three equivalent Mg(5) and three equivalent Mg(7) atoms to form a mixture of corner and edge-sharing OMg6 octahedra. The corner-sharing octahedra are not tilted. In the eleventh O site, O(11) is bonded to three equivalent Mg(6) and three equivalent Mg(7) atoms to form OMg6 octahedra that share corners with three equivalent O(12)Mg3Mn3 octahedra, corners with three equivalent O(10)Mg6 octahedra, edges with three equivalent O(12)Mg3Mn3 octahedra, edges with three equivalent O(10)Mg6 octahedra, and edges with six equivalent O(11)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the twelfth O site, O(12) is bonded to three equivalent Mg(6) and three equivalent Mn(1) atoms to form OMg3Mn3 octahedra that share corners with three equivalent O(11)Mg6 octahedra, corners with three equivalent O(1)Mn6 octahedra, edges with three equivalent O(11)Mg6 octahedra, edges with three equivalent O(1)Mn6 octahedra, and edges with six equivalent O(12)Mg3Mn3 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. is represented by the CIF file [CIF]
data_Mg7Mn5O12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.087
_cell_length_b   3.087
_cell_length_c   30.388
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   250.813
_cell_formula_units_Z   1
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
  Mg  Mg0  1  0.333  0.667  0.166  1.0
  Mg  Mg1  1  0.333  0.667  0.419  1.0
  Mg  Mg2  1  0.333  0.667  0.668  1.0
  Mg  Mg3  1  0.667  0.333  0.587  1.0
  Mg  Mg4  1  0.000  0.000  0.750  1.0
  Mg  Mg5  1  0.333  0.667  0.912  1.0
  Mg  Mg6  1  0.667  0.333  0.831  1.0
  Mn  Mn7  1  0.000  0.000  0.996  1.0
  Mn  Mn8  1  0.667  0.333  0.084  1.0
  Mn  Mn9  1  0.000  0.000  0.249  1.0
  Mn  Mn10  1  0.667  0.333  0.336  1.0
  Mn  Mn11  1  0.000  0.000  0.502  1.0
  O  O12  1  0.333  0.667  0.040  1.0
  O  O13  1  0.000  0.000  0.128  1.0
  O  O14  1  0.667  0.333  0.205  1.0
  O  O15  1  0.333  0.667  0.292  1.0
  O  O16  1  0.000  0.000  0.380  1.0
  O  O17  1  0.667  0.333  0.458  1.0
  O  O18  1  0.333  0.667  0.547  1.0
  O  O19  1  0.000  0.000  0.627  1.0
  O  O20  1  0.667  0.333  0.709  1.0
  O  O21  1  0.333  0.667  0.791  1.0
  O  O22  1  0.000  0.000  0.872  1.0
  O  O23  1  0.667  0.333  0.952  1.0
[/CIF]
.
The material structure described by Mg7Mn5O12 is Caswellsilverite-like structured and crystallizes in the trigonal P3m1 space group. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to three equivalent O(2) and three equivalent O(3) atoms to form MgO6 octahedra that share corners with three equivalent Mn(2)O6 octahedra, corners with three equivalent Mn(3)O6 octahedra, edges with three equivalent Mn(2)O6 octahedra, edges with three equivalent Mn(3)O6 octahedra, and edges with six equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 3°. In the second Mg site, Mg(2) is bonded to three equivalent O(5) and three equivalent O(6) atoms to form MgO6 octahedra that share corners with three equivalent Mn(4)O6 octahedra, corners with three equivalent Mn(5)O6 octahedra, edges with three equivalent Mn(4)O6 octahedra, edges with three equivalent Mn(5)O6 octahedra, and edges with six equivalent Mg(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-4°. In the third Mg site, Mg(3) is bonded to three equivalent O(8) and three equivalent O(9) atoms to form a mixture of corner and edge-sharing MgO6 octahedra. The corner-sharing octahedra are not tilted. In the fourth Mg site, Mg(4) is bonded to three equivalent O(7) and three equivalent O(8) atoms to form MgO6 octahedra that share corners with three equivalent Mg(3)O6 octahedra, corners with three equivalent Mn(5)O6 octahedra, edges with three equivalent Mg(3)O6 octahedra, edges with three equivalent Mn(5)O6 octahedra, and edges with six equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fifth Mg site, Mg(5) is bonded to three equivalent O(10) and three equivalent O(9) atoms to form a mixture of corner and edge-sharing MgO6 octahedra. The corner-sharing octahedra are not tilted. In the sixth Mg site, Mg(6) is bonded to three equivalent O(11) and three equivalent O(12) atoms to form MgO6 octahedra that share corners with three equivalent Mg(7)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra, edges with three equivalent Mg(7)O6 octahedra, edges with three equivalent Mn(1)O6 octahedra, and edges with six equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the seventh Mg site, Mg(7) is bonded to three equivalent O(10) and three equivalent O(11) atoms to form a mixture of corner and edge-sharing MgO6 octahedra. The corner-sharing octahedra are not tilted. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent O(1) and three equivalent O(12) atoms to form MnO6 octahedra that share corners with three equivalent Mg(6)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, edges with three equivalent Mg(6)O6 octahedra, edges with three equivalent Mn(2)O6 octahedra, and edges with six equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the second Mn site, Mn(2) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Mg(1)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mn(1)O6 octahedra, and edges with six equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third Mn site, Mn(3) is bonded to three equivalent O(3) and three equivalent O(4) atoms to form MnO6 octahedra that share corners with three equivalent Mg(1)O6 octahedra, corners with three equivalent Mn(4)O6 octahedra, edges with three equivalent Mg(1)O6 octahedra, edges with three equivalent Mn(4)O6 octahedra, and edges with six equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fourth Mn site, Mn(4) is bonded to three equivalent O(4) and three equivalent O(5) atoms to form MnO6 octahedra that share corners with three equivalent Mg(2)O6 octahedra, corners with three equivalent Mn(3)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Mn(3)O6 octahedra, and edges with six equivalent Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fifth Mn site, Mn(5) is bonded to three equivalent O(6) and three equivalent O(7) atoms to form MnO6 octahedra that share corners with three equivalent Mg(2)O6 octahedra, corners with three equivalent Mg(4)O6 octahedra, edges with three equivalent Mg(2)O6 octahedra, edges with three equivalent Mg(4)O6 octahedra, and edges with six equivalent Mn(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-4°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Mn(1) and three equivalent Mn(2) atoms to form OMn6 octahedra that share corners with three equivalent O(12)Mg3Mn3 octahedra, corners with three equivalent O(2)Mg3Mn3 octahedra, edges with three equivalent O(12)Mg3Mn3 octahedra, edges with three equivalent O(2)Mg3Mn3 octahedra, and edges with six equivalent O(1)Mn6 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded to three equivalent Mg(1) and three equivalent Mn(2) atoms to form OMg3Mn3 octahedra that share corners with three equivalent O(3)Mg3Mn3 octahedra, corners with three equivalent O(1)Mn6 octahedra, edges with three equivalent O(3)Mg3Mn3 octahedra, edges with three equivalent O(1)Mn6 octahedra, and edges with six equivalent O(2)Mg3Mn3 octahedra. The corner-sharing octahedra are not tilted. In the third O site, O(3) is bonded to three equivalent Mg(1) and three equivalent Mn(3) atoms to form OMg3Mn3 octahedra that share corners with three equivalent O(2)Mg3Mn3 octahedra, corners with three equivalent O(4)Mn6 octahedra, edges with three equivalent O(2)Mg3Mn3 octahedra, edges with three equivalent O(4)Mn6 octahedra, and edges with six equivalent O(3)Mg3Mn3 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(4) is bonded to three equivalent Mn(3) and three equivalent Mn(4) atoms to form OMn6 octahedra that share corners with three equivalent O(3)Mg3Mn3 octahedra, corners with three equivalent O(5)Mg3Mn3 octahedra, edges with three equivalent O(3)Mg3Mn3 octahedra, edges with three equivalent O(5)Mg3Mn3 octahedra, and edges with six equivalent O(4)Mn6 octahedra. The corner-sharing octahedra are not tilted. In the fifth O site, O(5) is bonded to three equivalent Mg(2) and three equivalent Mn(4) atoms to form OMg3Mn3 octahedra that share corners with three equivalent O(6)Mg3Mn3 octahedra, corners with three equivalent O(4)Mn6 octahedra, edges with three equivalent O(6)Mg3Mn3 octahedra, edges with three equivalent O(4)Mn6 octahedra, and edges with six equivalent O(5)Mg3Mn3 octahedra. The corner-sharing octahedra are not tilted. In the sixth O site, O(6) is bonded to three equivalent Mg(2) and three equivalent Mn(5) atoms to form a mixture of corner and edge-sharing OMg3Mn3 octahedra. The corner-sharing octahedra are not tilted. In the seventh O site, O(7) is bonded to three equivalent Mg(4) and three equivalent Mn(5) atoms to form OMg3Mn3 octahedra that share corners with three equivalent O(6)Mg3Mn3 octahedra, corners with three equivalent O(8)Mg6 octahedra, edges with three equivalent O(6)Mg3Mn3 octahedra, edges with three equivalent O(8)Mg6 octahedra, and edges with six equivalent O(7)Mg3Mn3 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the eighth O site, O(8) is bonded to three equivalent Mg(3) and three equivalent Mg(4) atoms to form OMg6 octahedra that share corners with three equivalent O(7)Mg3Mn3 octahedra, corners with three equivalent O(9)Mg6 octahedra, edges with three equivalent O(7)Mg3Mn3 octahedra, edges with three equivalent O(9)Mg6 octahedra, and edges with six equivalent O(8)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the ninth O site, O(9) is bonded to three equivalent Mg(3) and three equivalent Mg(5) atoms to form a mixture of corner and edge-sharing OMg6 octahedra. The corner-sharing octahedra are not tilted. In the tenth O site, O(10) is bonded to three equivalent Mg(5) and three equivalent Mg(7) atoms to form a mixture of corner and edge-sharing OMg6 octahedra. The corner-sharing octahedra are not tilted. In the eleventh O site, O(11) is bonded to three equivalent Mg(6) and three equivalent Mg(7) atoms to form OMg6 octahedra that share corners with three equivalent O(12)Mg3Mn3 octahedra, corners with three equivalent O(10)Mg6 octahedra, edges with three equivalent O(12)Mg3Mn3 octahedra, edges with three equivalent O(10)Mg6 octahedra, and edges with six equivalent O(11)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the twelfth O site, O(12) is bonded to three equivalent Mg(6) and three equivalent Mn(1) atoms to form OMg3Mn3 octahedra that share corners with three equivalent O(11)Mg6 octahedra, corners with three equivalent O(1)Mn6 octahedra, edges with three equivalent O(11)Mg6 octahedra, edges with three equivalent O(1)Mn6 octahedra, and edges with six equivalent O(12)Mg3Mn3 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. is represented by the CIF file [CIF]
data_Mg7Mn5O12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.087
_cell_length_b   3.087
_cell_length_c   30.388
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   250.813
_cell_formula_units_Z   1
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
  Mg  Mg0  1  0.333  0.667  0.166  1.0
  Mg  Mg1  1  0.333  0.667  0.419  1.0
  Mg  Mg2  1  0.333  0.667  0.668  1.0
  Mg  Mg3  1  0.667  0.333  0.587  1.0
  Mg  Mg4  1  0.000  0.000  0.750  1.0
  Mg  Mg5  1  0.333  0.667  0.912  1.0
  Mg  Mg6  1  0.667  0.333  0.831  1.0
  Mn  Mn7  1  0.000  0.000  0.996  1.0
  Mn  Mn8  1  0.667  0.333  0.084  1.0
  Mn  Mn9  1  0.000  0.000  0.249  1.0
  Mn  Mn10  1  0.667  0.333  0.336  1.0
  Mn  Mn11  1  0.000  0.000  0.502  1.0
  O  O12  1  0.333  0.667  0.040  1.0
  O  O13  1  0.000  0.000  0.128  1.0
  O  O14  1  0.667  0.333  0.205  1.0
  O  O15  1  0.333  0.667  0.292  1.0
  O  O16  1  0.000  0.000  0.380  1.0
  O  O17  1  0.667  0.333  0.458  1.0
  O  O18  1  0.333  0.667  0.547  1.0
  O  O19  1  0.000  0.000  0.627  1.0
  O  O20  1  0.667  0.333  0.709  1.0
  O  O21  1  0.333  0.667  0.791  1.0
  O  O22  1  0.000  0.000  0.872  1.0
  O  O23  1  0.667  0.333  0.952  1.0
[/CIF]
.