The crystal structure described by MgMo3O8 is Hydrophilite-derived structured and crystallizes in the orthorhombic Cmc2_1 space group. Mg(1) is bonded to one O(3), one O(5), two equivalent O(4), and two equivalent O(6) atoms to form MgO6 octahedra that share corners with two equivalent Mo(1)O6 octahedra, corners with four equivalent Mo(2)O6 octahedra,  an edgeedge with one Mo(1)O6 octahedra, and edges with two equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-54°. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(1), one O(2), two equivalent O(4), and two equivalent O(6) atoms to form distorted MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, and edges with four equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. In the second Mo site, Mo(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, edges with two equivalent Mo(1)O6 octahedra, and edges with two equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-53°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mo(1) and two equivalent Mo(2) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mo(1) and two equivalent Mo(2) atoms. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to one Mg(1) and two equivalent Mo(2) atoms. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Mg(1), one Mo(1), and one Mo(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Mo(2) atoms. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Mg(1), one Mo(1), and one Mo(2) atom. is represented by the CIF file [CIF]
data_MgMo3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.230
_cell_length_b   6.230
_cell_length_c   9.429
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.907
_symmetry_Int_Tables_number   1
_cell_volume   317.240
_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
  Mg  Mg0  1  0.337  0.663  0.532  1.0
  Mg  Mg1  1  0.663  0.337  0.032  1.0
  Mo  Mo2  1  0.166  0.834  0.239  1.0
  Mo  Mo3  1  0.165  0.339  0.245  1.0
  Mo  Mo4  1  0.661  0.835  0.245  1.0
  Mo  Mo5  1  0.834  0.166  0.739  1.0
  Mo  Mo6  1  0.835  0.661  0.745  1.0
  Mo  Mo7  1  0.339  0.165  0.745  1.0
  O  O8  1  0.994  0.006  0.348  1.0
  O  O9  1  0.006  0.994  0.848  1.0
  O  O10  1  0.340  0.660  0.127  1.0
  O  O11  1  0.660  0.340  0.627  1.0
  O  O12  1  0.472  0.528  0.365  1.0
  O  O13  1  0.481  0.944  0.362  1.0
  O  O14  1  0.056  0.519  0.362  1.0
  O  O15  1  0.528  0.472  0.865  1.0
  O  O16  1  0.519  0.056  0.862  1.0
  O  O17  1  0.944  0.481  0.862  1.0
  O  O18  1  0.167  0.833  0.640  1.0
  O  O19  1  0.172  0.326  0.645  1.0
  O  O20  1  0.674  0.828  0.645  1.0
  O  O21  1  0.833  0.167  0.140  1.0
  O  O22  1  0.828  0.674  0.145  1.0
  O  O23  1  0.326  0.172  0.145  1.0
[/CIF]
.
The crystal structure described by MgMo3O8 is Hydrophilite-derived structured and crystallizes in the orthorhombic Cmc2_1 space group. Mg(1) is bonded to one O(3), one O(5), two equivalent O(4), and two equivalent O(6) atoms to form MgO6 octahedra that share corners with two equivalent Mo(1)O6 octahedra, corners with four equivalent Mo(2)O6 octahedra,  an edgeedge with one Mo(1)O6 octahedra, and edges with two equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-54°. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(1), one O(2), two equivalent O(4), and two equivalent O(6) atoms to form distorted MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, and edges with four equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles are 54°. In the second Mo site, Mo(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, edges with two equivalent Mo(1)O6 octahedra, and edges with two equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-53°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mo(1) and two equivalent Mo(2) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mo(1) and two equivalent Mo(2) atoms. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to one Mg(1) and two equivalent Mo(2) atoms. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Mg(1), one Mo(1), and one Mo(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Mo(2) atoms. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Mg(1), one Mo(1), and one Mo(2) atom. is represented by the CIF file [CIF]
data_MgMo3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.230
_cell_length_b   6.230
_cell_length_c   9.429
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   119.907
_symmetry_Int_Tables_number   1
_cell_volume   317.240
_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
  Mg  Mg0  1  0.337  0.663  0.532  1.0
  Mg  Mg1  1  0.663  0.337  0.032  1.0
  Mo  Mo2  1  0.166  0.834  0.239  1.0
  Mo  Mo3  1  0.165  0.339  0.245  1.0
  Mo  Mo4  1  0.661  0.835  0.245  1.0
  Mo  Mo5  1  0.834  0.166  0.739  1.0
  Mo  Mo6  1  0.835  0.661  0.745  1.0
  Mo  Mo7  1  0.339  0.165  0.745  1.0
  O  O8  1  0.994  0.006  0.348  1.0
  O  O9  1  0.006  0.994  0.848  1.0
  O  O10  1  0.340  0.660  0.127  1.0
  O  O11  1  0.660  0.340  0.627  1.0
  O  O12  1  0.472  0.528  0.365  1.0
  O  O13  1  0.481  0.944  0.362  1.0
  O  O14  1  0.056  0.519  0.362  1.0
  O  O15  1  0.528  0.472  0.865  1.0
  O  O16  1  0.519  0.056  0.862  1.0
  O  O17  1  0.944  0.481  0.862  1.0
  O  O18  1  0.167  0.833  0.640  1.0
  O  O19  1  0.172  0.326  0.645  1.0
  O  O20  1  0.674  0.828  0.645  1.0
  O  O21  1  0.833  0.167  0.140  1.0
  O  O22  1  0.828  0.674  0.145  1.0
  O  O23  1  0.326  0.172  0.145  1.0
[/CIF]
.