The material described by RbMg14HfO15 crystallizes in the orthorhombic Pmm2 space group. Rb(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(10), and two equivalent O(6) atoms. There are ten inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(3), two equivalent O(10), and two equivalent O(7) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Hf(1)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with two equivalent Mg(8)O6 octahedra, edges with four equivalent Mg(3)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-3°. In the second Mg site, Mg(2) is bonded to one O(2), two equivalent O(11), and two equivalent O(8) atoms to form MgO5 square pyramids that share corners with two equivalent Hf(1)O6 octahedra, corners with two equivalent Mg(2)O5 square pyramids, corners with two equivalent Mg(9)O5 square pyramids, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(7)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles are 2°. In the third Mg site, Mg(3) is bonded to one O(4), one O(5), one O(6), one O(7), and two equivalent O(10) atoms to form MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra, corners with four equivalent Mg(3)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra,  an edgeedge with one Mg(7)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 2-13°. In the fourth Mg site, Mg(4) is bonded to one O(4), one O(5), one O(8), one O(9), and two equivalent O(11) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with four equivalent Mg(4)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra,  an edgeedge with one Mg(7)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Hf(1)O6 octahedra, edges with two equivalent Mg(2)O5 square pyramids, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-9°. In the fifth Mg site, Mg(5) is bonded in a distorted square co-planar geometry to one O(6), one O(8), and two equivalent O(4) atoms. In the sixth Mg site, Mg(6) is bonded to one O(7), one O(9), two equivalent O(1), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Hf(1)O6 octahedra, and edges with four equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-8°. In the seventh Mg site, Mg(7) is bonded to one O(6), one O(8), two equivalent O(2), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mg(7)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with four equivalent Mg(10)O6 octahedra, and edges with two equivalent Mg(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 3-10°. In the eighth Mg site, Mg(8) is bonded to one O(7), one O(9), two equivalent O(3), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Mg(7)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Hf(1)O6 octahedra, and edges with four equivalent Mg(10)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the ninth Mg site, Mg(9) is bonded to one O(1), one O(10), one O(11), and two equivalent O(4) atoms to form MgO5 square pyramids that share corners with two equivalent Mg(10)O6 octahedra,  a cornercorner with one Mg(2)O5 square pyramid, corners with three equivalent Mg(9)O5 square pyramids,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Hf(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-14°. In the tenth Mg site, Mg(10) is bonded to one O(10), one O(11), one O(2), one O(3), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with four equivalent Mg(10)O6 octahedra, corners with two equivalent Mg(9)O5 square pyramids,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Hf(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Mg(7)O6 octahedra, edges with two equivalent Mg(8)O6 octahedra, and  an edgeedge with one Mg(2)O5 square pyramid. The corner-sharing octahedral tilt angles range from 4-16°. Hf(1) is bonded to one O(1), one O(3), two equivalent O(11), and two equivalent O(9) atoms to form HfO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Hf(1)O6 octahedra, corners with two equivalent Mg(2)O5 square pyramids, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with two equivalent Mg(8)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-2°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), two equivalent Mg(6), two equivalent Mg(9), and one Hf(1) atom to form OHfMg5 octahedra that share corners with two equivalent O(1)HfMg5 octahedra, corners with two equivalent O(3)HfMg5 octahedra, edges with two equivalent O(9)Hf2Mg4 octahedra, edges with two equivalent O(11)HfMg5 octahedra, edges with two equivalent O(7)Mg6 octahedra, edges with two equivalent O(10)RbMg5 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-8°. In the second O site, O(2) is bonded to one Rb(1), one Mg(2), two equivalent Mg(10), and two equivalent Mg(7) atoms to form distorted ORbMg5 octahedra that share corners with two equivalent O(3)HfMg5 octahedra, corners with two equivalent O(2)RbMg5 octahedra, edges with two equivalent O(11)HfMg5 octahedra, edges with two equivalent O(8)Mg6 octahedra, edges with two equivalent O(6)Rb2Mg4 octahedra, edges with two equivalent O(10)RbMg5 octahedra, and edges with four equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles are 10°. In the third O site, O(3) is bonded to one Mg(1), two equivalent Mg(10), two equivalent Mg(8), and one Hf(1) atom to form OHfMg5 octahedra that share corners with two equivalent O(1)HfMg5 octahedra, corners with two equivalent O(3)HfMg5 octahedra, corners with two equivalent O(2)RbMg5 octahedra, edges with two equivalent O(9)Hf2Mg4 octahedra, edges with two equivalent O(11)HfMg5 octahedra, edges with two equivalent O(7)Mg6 octahedra, edges with two equivalent O(10)RbMg5 octahedra, and edges with four equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the fourth O site, O(4) is bonded to one Mg(3), one Mg(4), one Mg(5), one Mg(6), and two equivalent Mg(9) atoms to form OMg6 octahedra that share corners with two equivalent O(5)Mg6 octahedra, corners with four equivalent O(4)Mg6 octahedra,  an edgeedge with one O(9)Hf2Mg4 octahedra,  an edgeedge with one O(7)Mg6 octahedra,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(6)Rb2Mg4 octahedra, edges with two equivalent O(1)HfMg5 octahedra, edges with two equivalent O(11)HfMg5 octahedra, and edges with two equivalent O(10)RbMg5 octahedra. The corner-sharing octahedral tilt angles range from 2-8°. In the fifth O site, O(5) is bonded to one Mg(3), one Mg(4), one Mg(7), one Mg(8), and two equivalent Mg(10) atoms to form OMg6 octahedra that share corners with two equivalent O(4)Mg6 octahedra, corners with four equivalent O(5)Mg6 octahedra,  an edgeedge with one O(9)Hf2Mg4 octahedra,  an edgeedge with one O(7)Mg6 octahedra,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(6)Rb2Mg4 octahedra, edges with two equivalent O(11)HfMg5 octahedra, edges with two equivalent O(3)HfMg5 octahedra, edges with two equivalent O(10)RbMg5 octahedra, and edges with two equivalent O(2)RbMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the sixth O site, O(6) is bonded to two equivalent Rb(1), one Mg(5), one Mg(7), and two equivalent Mg(3) atoms to form distorted ORb2Mg4 octahedra that share corners with two equivalent O(7)Mg6 octahedra, corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(6)Rb2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(2)RbMg5 octahedra, and edges with four equivalent O(10)RbMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-32°. In the seventh O site, O(7) is bonded to one Mg(6), one Mg(8), two equivalent Mg(1), and two equivalent Mg(3) atoms to form OMg6 octahedra that share corners with two equivalent O(9)Hf2Mg4 octahedra, corners with two equivalent O(7)Mg6 octahedra, corners with two equivalent O(6)Rb2Mg4 octahedra, edges with two equivalent O(1)HfMg5 octahedra, edges with two equivalent O(3)HfMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with four equivalent O(10)RbMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the eighth O site, O(8) is bonded to one Mg(5), one Mg(7), two equivalent Mg(2), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(9)Hf2Mg4 octahedra, corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(6)Rb2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(2)RbMg5 octahedra, and edges with four equivalent O(11)HfMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the ninth O site, O(9) is bonded to one Mg(6), one Mg(8), two equivalent Mg(4), and two equivalent Hf(1) atoms to form OHf2Mg4 octahedra that share corners with two equivalent O(9)Hf2Mg4 octahedra, corners with two equivalent O(7)Mg6 octahedra, corners with two equivalent O(8)Mg6 octahedra, edges with two equivalent O(1)HfMg5 octahedra, edges with two equivalent O(3)HfMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with four equivalent O(11)HfMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the tenth O site, O(10) is bonded to one Rb(1), one Mg(1), one Mg(10), one Mg(9), and two equivalent Mg(3) atoms to form distorted ORbMg5 octahedra that share corners with two equivalent O(11)HfMg5 octahedra, corners with four equivalent O(10)RbMg5 octahedra,  an edgeedge with one O(1)HfMg5 octahedra,  an edgeedge with one O(3)HfMg5 octahedra,  an edgeedge with one O(2)RbMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(7)Mg6 octahedra, and edges with two equivalent O(6)Rb2Mg4 octahedra. The corner-sharing octahedral tilt angles range from 2-19°. In the eleventh O site, O(11) is bonded to one Mg(10), one Mg(2), one Mg(9), two equivalent Mg(4), and one Hf(1) atom to form OHfMg5 octahedra that share corners with two equivalent O(10)RbMg5 octahedra, corners with four equivalent O(11)HfMg5 octahedra,  an edgeedge with one O(1)HfMg5 octahedra,  an edgeedge with one O(3)HfMg5 octahedra,  an edgeedge with one O(2)RbMg5 octahedra, edges with two equivalent O(9)Hf2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with two equivalent O(8)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 1-16°. is represented by the CIF card [CIF]
data_RbHfMg14O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.707
_cell_length_b   8.891
_cell_length_c   4.431
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   343.053
_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
  Rb  Rb0  1  0.046  0.000  0.000  1.0
  Hf  Hf1  1  0.506  0.500  0.000  1.0
  Mg  Mg2  1  0.993  0.500  0.000  1.0
  Mg  Mg3  1  0.494  0.000  0.000  1.0
  Mg  Mg4  1  0.994  0.251  0.500  1.0
  Mg  Mg5  1  0.994  0.749  0.500  1.0
  Mg  Mg6  1  0.502  0.241  0.500  1.0
  Mg  Mg7  1  0.502  0.759  0.500  1.0
  Mg  Mg8  1  0.266  0.000  0.500  1.0
  Mg  Mg9  1  0.238  0.500  0.500  1.0
  Mg  Mg10  1  0.747  0.000  0.500  1.0
  Mg  Mg11  1  0.759  0.500  0.500  1.0
  Mg  Mg12  1  0.247  0.262  0.000  1.0
  Mg  Mg13  1  0.247  0.738  0.000  1.0
  Mg  Mg14  1  0.758  0.236  0.000  1.0
  Mg  Mg15  1  0.758  0.764  0.000  1.0
  O  O16  1  0.256  0.500  0.000  1.0
  O  O17  1  0.725  0.000  0.000  1.0
  O  O18  1  0.747  0.500  0.000  1.0
  O  O19  1  0.249  0.255  0.500  1.0
  O  O20  1  0.249  0.745  0.500  1.0
  O  O21  1  0.746  0.254  0.500  1.0
  O  O22  1  0.746  0.746  0.500  1.0
  O  O23  1  0.973  0.000  0.500  1.0
  O  O24  1  0.999  0.500  0.500  1.0
  O  O25  1  0.505  0.000  0.500  1.0
  O  O26  1  0.502  0.500  0.500  1.0
  O  O27  1  0.997  0.279  0.000  1.0
  O  O28  1  0.997  0.721  0.000  1.0
  O  O29  1  0.504  0.260  0.000  1.0
  O  O30  1  0.504  0.740  0.000  1.0
[/CIF]
.
The material described by RbMg14HfO15 crystallizes in the orthorhombic Pmm2 space group. Rb(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(10), and two equivalent O(6) atoms. There are ten inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(3), two equivalent O(10), and two equivalent O(7) atoms to form MgO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Hf(1)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with two equivalent Mg(8)O6 octahedra, edges with four equivalent Mg(3)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-3°. In the second Mg site, Mg(2) is bonded to one O(2), two equivalent O(11), and two equivalent O(8) atoms to form MgO5 square pyramids that share corners with two equivalent Hf(1)O6 octahedra, corners with two equivalent Mg(2)O5 square pyramids, corners with two equivalent Mg(9)O5 square pyramids, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(7)O6 octahedra, and edges with four equivalent Mg(4)O6 octahedra. The corner-sharing octahedral tilt angles are 2°. In the third Mg site, Mg(3) is bonded to one O(4), one O(5), one O(6), one O(7), and two equivalent O(10) atoms to form MgO6 octahedra that share corners with two equivalent Mg(4)O6 octahedra, corners with four equivalent Mg(3)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra,  an edgeedge with one Mg(7)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 2-13°. In the fourth Mg site, Mg(4) is bonded to one O(4), one O(5), one O(8), one O(9), and two equivalent O(11) atoms to form MgO6 octahedra that share corners with two equivalent Mg(3)O6 octahedra, corners with four equivalent Mg(4)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra,  an edgeedge with one Mg(7)O6 octahedra,  an edgeedge with one Mg(8)O6 octahedra, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Hf(1)O6 octahedra, edges with two equivalent Mg(2)O5 square pyramids, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-9°. In the fifth Mg site, Mg(5) is bonded in a distorted square co-planar geometry to one O(6), one O(8), and two equivalent O(4) atoms. In the sixth Mg site, Mg(6) is bonded to one O(7), one O(9), two equivalent O(1), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Hf(1)O6 octahedra, and edges with four equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-8°. In the seventh Mg site, Mg(7) is bonded to one O(6), one O(8), two equivalent O(2), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mg(7)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with four equivalent Mg(10)O6 octahedra, and edges with two equivalent Mg(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 3-10°. In the eighth Mg site, Mg(8) is bonded to one O(7), one O(9), two equivalent O(3), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Mg(7)O6 octahedra, corners with two equivalent Mg(8)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Hf(1)O6 octahedra, and edges with four equivalent Mg(10)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the ninth Mg site, Mg(9) is bonded to one O(1), one O(10), one O(11), and two equivalent O(4) atoms to form MgO5 square pyramids that share corners with two equivalent Mg(10)O6 octahedra,  a cornercorner with one Mg(2)O5 square pyramid, corners with three equivalent Mg(9)O5 square pyramids,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Hf(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-14°. In the tenth Mg site, Mg(10) is bonded to one O(10), one O(11), one O(2), one O(3), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with four equivalent Mg(10)O6 octahedra, corners with two equivalent Mg(9)O5 square pyramids,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one Hf(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, edges with two equivalent Mg(4)O6 octahedra, edges with two equivalent Mg(7)O6 octahedra, edges with two equivalent Mg(8)O6 octahedra, and  an edgeedge with one Mg(2)O5 square pyramid. The corner-sharing octahedral tilt angles range from 4-16°. Hf(1) is bonded to one O(1), one O(3), two equivalent O(11), and two equivalent O(9) atoms to form HfO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Hf(1)O6 octahedra, corners with two equivalent Mg(2)O5 square pyramids, edges with two equivalent Mg(10)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, edges with two equivalent Mg(8)O6 octahedra, edges with four equivalent Mg(4)O6 octahedra, and edges with two equivalent Mg(9)O5 square pyramids. The corner-sharing octahedral tilt angles range from 0-2°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), two equivalent Mg(6), two equivalent Mg(9), and one Hf(1) atom to form OHfMg5 octahedra that share corners with two equivalent O(1)HfMg5 octahedra, corners with two equivalent O(3)HfMg5 octahedra, edges with two equivalent O(9)Hf2Mg4 octahedra, edges with two equivalent O(11)HfMg5 octahedra, edges with two equivalent O(7)Mg6 octahedra, edges with two equivalent O(10)RbMg5 octahedra, and edges with four equivalent O(4)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-8°. In the second O site, O(2) is bonded to one Rb(1), one Mg(2), two equivalent Mg(10), and two equivalent Mg(7) atoms to form distorted ORbMg5 octahedra that share corners with two equivalent O(3)HfMg5 octahedra, corners with two equivalent O(2)RbMg5 octahedra, edges with two equivalent O(11)HfMg5 octahedra, edges with two equivalent O(8)Mg6 octahedra, edges with two equivalent O(6)Rb2Mg4 octahedra, edges with two equivalent O(10)RbMg5 octahedra, and edges with four equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles are 10°. In the third O site, O(3) is bonded to one Mg(1), two equivalent Mg(10), two equivalent Mg(8), and one Hf(1) atom to form OHfMg5 octahedra that share corners with two equivalent O(1)HfMg5 octahedra, corners with two equivalent O(3)HfMg5 octahedra, corners with two equivalent O(2)RbMg5 octahedra, edges with two equivalent O(9)Hf2Mg4 octahedra, edges with two equivalent O(11)HfMg5 octahedra, edges with two equivalent O(7)Mg6 octahedra, edges with two equivalent O(10)RbMg5 octahedra, and edges with four equivalent O(5)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the fourth O site, O(4) is bonded to one Mg(3), one Mg(4), one Mg(5), one Mg(6), and two equivalent Mg(9) atoms to form OMg6 octahedra that share corners with two equivalent O(5)Mg6 octahedra, corners with four equivalent O(4)Mg6 octahedra,  an edgeedge with one O(9)Hf2Mg4 octahedra,  an edgeedge with one O(7)Mg6 octahedra,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(6)Rb2Mg4 octahedra, edges with two equivalent O(1)HfMg5 octahedra, edges with two equivalent O(11)HfMg5 octahedra, and edges with two equivalent O(10)RbMg5 octahedra. The corner-sharing octahedral tilt angles range from 2-8°. In the fifth O site, O(5) is bonded to one Mg(3), one Mg(4), one Mg(7), one Mg(8), and two equivalent Mg(10) atoms to form OMg6 octahedra that share corners with two equivalent O(4)Mg6 octahedra, corners with four equivalent O(5)Mg6 octahedra,  an edgeedge with one O(9)Hf2Mg4 octahedra,  an edgeedge with one O(7)Mg6 octahedra,  an edgeedge with one O(8)Mg6 octahedra,  an edgeedge with one O(6)Rb2Mg4 octahedra, edges with two equivalent O(11)HfMg5 octahedra, edges with two equivalent O(3)HfMg5 octahedra, edges with two equivalent O(10)RbMg5 octahedra, and edges with two equivalent O(2)RbMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the sixth O site, O(6) is bonded to two equivalent Rb(1), one Mg(5), one Mg(7), and two equivalent Mg(3) atoms to form distorted ORb2Mg4 octahedra that share corners with two equivalent O(7)Mg6 octahedra, corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(6)Rb2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(2)RbMg5 octahedra, and edges with four equivalent O(10)RbMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-32°. In the seventh O site, O(7) is bonded to one Mg(6), one Mg(8), two equivalent Mg(1), and two equivalent Mg(3) atoms to form OMg6 octahedra that share corners with two equivalent O(9)Hf2Mg4 octahedra, corners with two equivalent O(7)Mg6 octahedra, corners with two equivalent O(6)Rb2Mg4 octahedra, edges with two equivalent O(1)HfMg5 octahedra, edges with two equivalent O(3)HfMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with four equivalent O(10)RbMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the eighth O site, O(8) is bonded to one Mg(5), one Mg(7), two equivalent Mg(2), and two equivalent Mg(4) atoms to form OMg6 octahedra that share corners with two equivalent O(9)Hf2Mg4 octahedra, corners with two equivalent O(8)Mg6 octahedra, corners with two equivalent O(6)Rb2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(2)RbMg5 octahedra, and edges with four equivalent O(11)HfMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the ninth O site, O(9) is bonded to one Mg(6), one Mg(8), two equivalent Mg(4), and two equivalent Hf(1) atoms to form OHf2Mg4 octahedra that share corners with two equivalent O(9)Hf2Mg4 octahedra, corners with two equivalent O(7)Mg6 octahedra, corners with two equivalent O(8)Mg6 octahedra, edges with two equivalent O(1)HfMg5 octahedra, edges with two equivalent O(3)HfMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with four equivalent O(11)HfMg5 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the tenth O site, O(10) is bonded to one Rb(1), one Mg(1), one Mg(10), one Mg(9), and two equivalent Mg(3) atoms to form distorted ORbMg5 octahedra that share corners with two equivalent O(11)HfMg5 octahedra, corners with four equivalent O(10)RbMg5 octahedra,  an edgeedge with one O(1)HfMg5 octahedra,  an edgeedge with one O(3)HfMg5 octahedra,  an edgeedge with one O(2)RbMg5 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, edges with two equivalent O(7)Mg6 octahedra, and edges with two equivalent O(6)Rb2Mg4 octahedra. The corner-sharing octahedral tilt angles range from 2-19°. In the eleventh O site, O(11) is bonded to one Mg(10), one Mg(2), one Mg(9), two equivalent Mg(4), and one Hf(1) atom to form OHfMg5 octahedra that share corners with two equivalent O(10)RbMg5 octahedra, corners with four equivalent O(11)HfMg5 octahedra,  an edgeedge with one O(1)HfMg5 octahedra,  an edgeedge with one O(3)HfMg5 octahedra,  an edgeedge with one O(2)RbMg5 octahedra, edges with two equivalent O(9)Hf2Mg4 octahedra, edges with two equivalent O(4)Mg6 octahedra, edges with two equivalent O(5)Mg6 octahedra, and edges with two equivalent O(8)Mg6 octahedra. The corner-sharing octahedral tilt angles range from 1-16°. is represented by the CIF card [CIF]
data_RbHfMg14O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.707
_cell_length_b   8.891
_cell_length_c   4.431
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   343.053
_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
  Rb  Rb0  1  0.046  0.000  0.000  1.0
  Hf  Hf1  1  0.506  0.500  0.000  1.0
  Mg  Mg2  1  0.993  0.500  0.000  1.0
  Mg  Mg3  1  0.494  0.000  0.000  1.0
  Mg  Mg4  1  0.994  0.251  0.500  1.0
  Mg  Mg5  1  0.994  0.749  0.500  1.0
  Mg  Mg6  1  0.502  0.241  0.500  1.0
  Mg  Mg7  1  0.502  0.759  0.500  1.0
  Mg  Mg8  1  0.266  0.000  0.500  1.0
  Mg  Mg9  1  0.238  0.500  0.500  1.0
  Mg  Mg10  1  0.747  0.000  0.500  1.0
  Mg  Mg11  1  0.759  0.500  0.500  1.0
  Mg  Mg12  1  0.247  0.262  0.000  1.0
  Mg  Mg13  1  0.247  0.738  0.000  1.0
  Mg  Mg14  1  0.758  0.236  0.000  1.0
  Mg  Mg15  1  0.758  0.764  0.000  1.0
  O  O16  1  0.256  0.500  0.000  1.0
  O  O17  1  0.725  0.000  0.000  1.0
  O  O18  1  0.747  0.500  0.000  1.0
  O  O19  1  0.249  0.255  0.500  1.0
  O  O20  1  0.249  0.745  0.500  1.0
  O  O21  1  0.746  0.254  0.500  1.0
  O  O22  1  0.746  0.746  0.500  1.0
  O  O23  1  0.973  0.000  0.500  1.0
  O  O24  1  0.999  0.500  0.500  1.0
  O  O25  1  0.505  0.000  0.500  1.0
  O  O26  1  0.502  0.500  0.500  1.0
  O  O27  1  0.997  0.279  0.000  1.0
  O  O28  1  0.997  0.721  0.000  1.0
  O  O29  1  0.504  0.260  0.000  1.0
  O  O30  1  0.504  0.740  0.000  1.0
[/CIF]
.