The material structure described by MgMn2(CO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(10), one O(3), one O(5), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-63°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(4), and one O(9) atom to form distorted MnO6 octahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid. In the second Mn site, Mn(2) is bonded to one O(10), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MnO6 octahedra that share corners with two equivalent Mg(1)O5 trigonal bipyramids and  an edgeedge with one Mg(1)O5 trigonal bipyramid. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(7), one O(8), and one O(9) atom. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(12) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one C(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Mn(1) and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(2), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(2), and one C(2) atom. In the sixth O site, O(6) is bonded in an L-shaped geometry to one Mn(2) and one C(2) atom. In the seventh O site, O(7) is bonded in an L-shaped geometry to one Mn(2) and one C(3) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(2), and one C(3) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one C(4) atom. In the eleventh O site, O(11) is bonded in an L-shaped geometry to one Mn(1) and one C(4) atom. In the twelfth O site, O(12) is bonded in a distorted L-shaped geometry to one Mn(1) and one C(4) atom. is represented by the CIF card [CIF]
data_MgMn2(CO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.455
_cell_length_b   7.992
_cell_length_c   5.201
_cell_angle_alpha   88.642
_cell_angle_beta   70.767
_cell_angle_gamma   88.176
_symmetry_Int_Tables_number   1
_cell_volume   253.170
_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  0.183  0.456  0.215  1.0
  Mn  Mn1  1  0.978  0.007  0.008  1.0
  Mn  Mn2  1  0.540  0.509  0.527  1.0
  C  C3  1  0.118  0.276  0.753  1.0
  C  C4  1  0.357  0.758  0.780  1.0
  C  C5  1  0.619  0.255  0.260  1.0
  C  C6  1  0.884  0.735  0.216  1.0
  O  O7  1  0.119  0.270  0.004  1.0
  O  O8  1  0.058  0.142  0.665  1.0
  O  O9  1  0.174  0.408  0.602  1.0
  O  O10  1  0.289  0.895  0.890  1.0
  O  O11  1  0.369  0.616  0.914  1.0
  O  O12  1  0.433  0.739  0.515  1.0
  O  O13  1  0.641  0.274  0.500  1.0
  O  O14  1  0.532  0.388  0.175  1.0
  O  O15  1  0.678  0.126  0.120  1.0
  O  O16  1  0.876  0.587  0.335  1.0
  O  O17  1  0.914  0.868  0.339  1.0
  O  O18  1  0.875  0.756  0.976  1.0
[/CIF]
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The material structure described by MgMn2(CO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(10), one O(3), one O(5), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-63°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(4), and one O(9) atom to form distorted MnO6 octahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid. In the second Mn site, Mn(2) is bonded to one O(10), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MnO6 octahedra that share corners with two equivalent Mg(1)O5 trigonal bipyramids and  an edgeedge with one Mg(1)O5 trigonal bipyramid. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(7), one O(8), and one O(9) atom. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(12) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one C(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Mn(1) and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(2), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(2), and one C(2) atom. In the sixth O site, O(6) is bonded in an L-shaped geometry to one Mn(2) and one C(2) atom. In the seventh O site, O(7) is bonded in an L-shaped geometry to one Mn(2) and one C(3) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Mg(1), one Mn(2), and one C(3) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one C(4) atom. In the eleventh O site, O(11) is bonded in an L-shaped geometry to one Mn(1) and one C(4) atom. In the twelfth O site, O(12) is bonded in a distorted L-shaped geometry to one Mn(1) and one C(4) atom. is represented by the CIF card [CIF]
data_MgMn2(CO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.455
_cell_length_b   7.992
_cell_length_c   5.201
_cell_angle_alpha   88.642
_cell_angle_beta   70.767
_cell_angle_gamma   88.176
_symmetry_Int_Tables_number   1
_cell_volume   253.170
_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  0.183  0.456  0.215  1.0
  Mn  Mn1  1  0.978  0.007  0.008  1.0
  Mn  Mn2  1  0.540  0.509  0.527  1.0
  C  C3  1  0.118  0.276  0.753  1.0
  C  C4  1  0.357  0.758  0.780  1.0
  C  C5  1  0.619  0.255  0.260  1.0
  C  C6  1  0.884  0.735  0.216  1.0
  O  O7  1  0.119  0.270  0.004  1.0
  O  O8  1  0.058  0.142  0.665  1.0
  O  O9  1  0.174  0.408  0.602  1.0
  O  O10  1  0.289  0.895  0.890  1.0
  O  O11  1  0.369  0.616  0.914  1.0
  O  O12  1  0.433  0.739  0.515  1.0
  O  O13  1  0.641  0.274  0.500  1.0
  O  O14  1  0.532  0.388  0.175  1.0
  O  O15  1  0.678  0.126  0.120  1.0
  O  O16  1  0.876  0.587  0.335  1.0
  O  O17  1  0.914  0.868  0.339  1.0
  O  O18  1  0.875  0.756  0.976  1.0
[/CIF]
.