The compound described by RbLiMg(BH4)4 crystallizes in the orthorhombic Aea2 space group. Rb(1) is bonded in a 14-coordinate geometry to two equivalent H(1), two equivalent H(2), two equivalent H(4), two equivalent H(5), two equivalent H(7), and four equivalent H(6) atoms. Li(1) is bonded in a 6-coordinate geometry to two equivalent H(1), two equivalent H(2), and two equivalent H(5) atoms. Mg(1) is bonded to two equivalent H(3), two equivalent H(4), two equivalent H(7), and two equivalent H(8) atoms to form distorted MgH8 hexagonal bipyramids that share edges with two equivalent B(1)H4 tetrahedra and edges with two equivalent B(2)H4 tetrahedra. There are two inequivalent B sites. In the first B site, B(1) is bonded to one H(4), one H(5), one H(6), and one H(7) atom to form BH4 tetrahedra that share  an edgeedge with one Mg(1)H8 hexagonal bipyramid. In the second B site, B(2) is bonded to one H(1), one H(2), one H(3), and one H(8) atom to form BH4 tetrahedra that share  an edgeedge with one Mg(1)H8 hexagonal bipyramid. There are eight inequivalent H sites. In the first H site, H(2) is bonded in a distorted single-bond geometry to one Rb(1), one Li(1), and one B(2) atom. In the second H site, H(3) is bonded in an L-shaped geometry to one Mg(1) and one B(2) atom. In the third H site, H(4) is bonded in a distorted L-shaped geometry to one Rb(1), one Mg(1), and one B(1) atom. In the fourth H site, H(5) is bonded in a water-like geometry to one Rb(1), one Li(1), and one B(1) atom. In the fifth H site, H(6) is bonded in a single-bond geometry to two equivalent Rb(1) and one B(1) atom. In the sixth H site, H(7) is bonded in a 2-coordinate geometry to one Rb(1), one Mg(1), and one B(1) atom. In the seventh H site, H(8) is bonded in an L-shaped geometry to one Mg(1) and one B(2) atom. In the eighth H site, H(1) is bonded in a 3-coordinate geometry to one Rb(1), one Li(1), and one B(2) atom. is represented by the CIF card [CIF]
data_RbLiMg(BH4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.847
_cell_length_b   7.847
_cell_length_c   8.254
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   105.304
_symmetry_Int_Tables_number   1
_cell_volume   490.281
_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
  Rb  Rb0  1  0.204  0.796  0.500  1.0
  Rb  Rb1  1  0.704  0.296  0.000  1.0
  Li  Li2  1  0.847  0.153  0.500  1.0
  Li  Li3  1  0.347  0.653  0.000  1.0
  Mg  Mg4  1  0.559  0.441  0.500  1.0
  Mg  Mg5  1  0.059  0.941  0.000  1.0
  B  B6  1  0.034  0.642  0.105  1.0
  B  B7  1  0.358  0.966  0.895  1.0
  B  B8  1  0.534  0.142  0.395  1.0
  B  B9  1  0.858  0.466  0.605  1.0
  B  B10  1  0.479  0.588  0.266  1.0
  B  B11  1  0.412  0.521  0.734  1.0
  B  B12  1  0.979  0.088  0.234  1.0
  B  B13  1  0.912  0.021  0.766  1.0
  H  H14  1  0.407  0.706  0.251  1.0
  H  H15  1  0.294  0.593  0.749  1.0
  H  H16  1  0.907  0.206  0.249  1.0
  H  H17  1  0.794  0.093  0.751  1.0
  H  H18  1  0.523  0.540  0.135  1.0
  H  H19  1  0.460  0.477  0.865  1.0
  H  H20  1  0.023  0.040  0.365  1.0
  H  H21  1  0.960  0.977  0.635  1.0
  H  H22  1  0.615  0.650  0.345  1.0
  H  H23  1  0.350  0.385  0.655  1.0
  H  H24  1  0.115  0.150  0.155  1.0
  H  H25  1  0.850  0.885  0.845  1.0
  H  H26  1  0.926  0.686  0.016  1.0
  H  H27  1  0.314  0.074  0.984  1.0
  H  H28  1  0.426  0.186  0.484  1.0
  H  H29  1  0.814  0.574  0.516  1.0
  H  H30  1  0.096  0.540  0.026  1.0
  H  H31  1  0.460  0.904  0.974  1.0
  H  H32  1  0.596  0.040  0.474  1.0
  H  H33  1  0.960  0.404  0.526  1.0
  H  H34  1  0.956  0.573  0.225  1.0
  H  H35  1  0.427  0.044  0.775  1.0
  H  H36  1  0.456  0.073  0.275  1.0
  H  H37  1  0.927  0.544  0.725  1.0
  H  H38  1  0.153  0.772  0.147  1.0
  H  H39  1  0.228  0.847  0.853  1.0
  H  H40  1  0.653  0.272  0.353  1.0
  H  H41  1  0.728  0.347  0.647  1.0
  H  H42  1  0.375  0.460  0.331  1.0
  H  H43  1  0.540  0.625  0.669  1.0
  H  H44  1  0.875  0.960  0.169  1.0
  H  H45  1  0.040  0.125  0.831  1.0
[/CIF]
.
The compound described by RbLiMg(BH4)4 crystallizes in the orthorhombic Aea2 space group. Rb(1) is bonded in a 14-coordinate geometry to two equivalent H(1), two equivalent H(2), two equivalent H(4), two equivalent H(5), two equivalent H(7), and four equivalent H(6) atoms. Li(1) is bonded in a 6-coordinate geometry to two equivalent H(1), two equivalent H(2), and two equivalent H(5) atoms. Mg(1) is bonded to two equivalent H(3), two equivalent H(4), two equivalent H(7), and two equivalent H(8) atoms to form distorted MgH8 hexagonal bipyramids that share edges with two equivalent B(1)H4 tetrahedra and edges with two equivalent B(2)H4 tetrahedra. There are two inequivalent B sites. In the first B site, B(1) is bonded to one H(4), one H(5), one H(6), and one H(7) atom to form BH4 tetrahedra that share  an edgeedge with one Mg(1)H8 hexagonal bipyramid. In the second B site, B(2) is bonded to one H(1), one H(2), one H(3), and one H(8) atom to form BH4 tetrahedra that share  an edgeedge with one Mg(1)H8 hexagonal bipyramid. There are eight inequivalent H sites. In the first H site, H(2) is bonded in a distorted single-bond geometry to one Rb(1), one Li(1), and one B(2) atom. In the second H site, H(3) is bonded in an L-shaped geometry to one Mg(1) and one B(2) atom. In the third H site, H(4) is bonded in a distorted L-shaped geometry to one Rb(1), one Mg(1), and one B(1) atom. In the fourth H site, H(5) is bonded in a water-like geometry to one Rb(1), one Li(1), and one B(1) atom. In the fifth H site, H(6) is bonded in a single-bond geometry to two equivalent Rb(1) and one B(1) atom. In the sixth H site, H(7) is bonded in a 2-coordinate geometry to one Rb(1), one Mg(1), and one B(1) atom. In the seventh H site, H(8) is bonded in an L-shaped geometry to one Mg(1) and one B(2) atom. In the eighth H site, H(1) is bonded in a 3-coordinate geometry to one Rb(1), one Li(1), and one B(2) atom. is represented by the CIF card [CIF]
data_RbLiMg(BH4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.847
_cell_length_b   7.847
_cell_length_c   8.254
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   105.304
_symmetry_Int_Tables_number   1
_cell_volume   490.281
_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
  Rb  Rb0  1  0.204  0.796  0.500  1.0
  Rb  Rb1  1  0.704  0.296  0.000  1.0
  Li  Li2  1  0.847  0.153  0.500  1.0
  Li  Li3  1  0.347  0.653  0.000  1.0
  Mg  Mg4  1  0.559  0.441  0.500  1.0
  Mg  Mg5  1  0.059  0.941  0.000  1.0
  B  B6  1  0.034  0.642  0.105  1.0
  B  B7  1  0.358  0.966  0.895  1.0
  B  B8  1  0.534  0.142  0.395  1.0
  B  B9  1  0.858  0.466  0.605  1.0
  B  B10  1  0.479  0.588  0.266  1.0
  B  B11  1  0.412  0.521  0.734  1.0
  B  B12  1  0.979  0.088  0.234  1.0
  B  B13  1  0.912  0.021  0.766  1.0
  H  H14  1  0.407  0.706  0.251  1.0
  H  H15  1  0.294  0.593  0.749  1.0
  H  H16  1  0.907  0.206  0.249  1.0
  H  H17  1  0.794  0.093  0.751  1.0
  H  H18  1  0.523  0.540  0.135  1.0
  H  H19  1  0.460  0.477  0.865  1.0
  H  H20  1  0.023  0.040  0.365  1.0
  H  H21  1  0.960  0.977  0.635  1.0
  H  H22  1  0.615  0.650  0.345  1.0
  H  H23  1  0.350  0.385  0.655  1.0
  H  H24  1  0.115  0.150  0.155  1.0
  H  H25  1  0.850  0.885  0.845  1.0
  H  H26  1  0.926  0.686  0.016  1.0
  H  H27  1  0.314  0.074  0.984  1.0
  H  H28  1  0.426  0.186  0.484  1.0
  H  H29  1  0.814  0.574  0.516  1.0
  H  H30  1  0.096  0.540  0.026  1.0
  H  H31  1  0.460  0.904  0.974  1.0
  H  H32  1  0.596  0.040  0.474  1.0
  H  H33  1  0.960  0.404  0.526  1.0
  H  H34  1  0.956  0.573  0.225  1.0
  H  H35  1  0.427  0.044  0.775  1.0
  H  H36  1  0.456  0.073  0.275  1.0
  H  H37  1  0.927  0.544  0.725  1.0
  H  H38  1  0.153  0.772  0.147  1.0
  H  H39  1  0.228  0.847  0.853  1.0
  H  H40  1  0.653  0.272  0.353  1.0
  H  H41  1  0.728  0.347  0.647  1.0
  H  H42  1  0.375  0.460  0.331  1.0
  H  H43  1  0.540  0.625  0.669  1.0
  H  H44  1  0.875  0.960  0.169  1.0
  H  H45  1  0.040  0.125  0.831  1.0
[/CIF]
.