The crystal structure described by MgYb2Cu(GeO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(12), one O(3), one O(5), one O(6), one O(7), and one O(9) atom. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(4), and one O(9) atom to form distorted YbO6 pentagonal pyramids that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(4)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(3)O4 tetrahedra, and  an edgeedge with one Cu(1)O5 square pyramid. In the second Yb site, Yb(2) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), and one O(8) atom. Cu(1) is bonded to one O(10), one O(11), one O(12), one O(8), and one O(9) atom to form distorted CuO5 square pyramids that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(4)O4 tetrahedra, and  an edgeedge with one Yb(1)O6 pentagonal pyramid. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(11), one O(5), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Yb(1)O6 pentagonal pyramid,  a cornercorner with one Cu(1)O5 square pyramid,  a cornercorner with one Ge(3)O4 tetrahedra, and  a cornercorner with one Ge(4)O4 tetrahedra. In the second Ge site, Ge(2) is bonded to one O(10), one O(12), one O(2), and one O(6) atom to form GeO4 tetrahedra that share corners with two equivalent Yb(1)O6 pentagonal pyramids, corners with two equivalent Cu(1)O5 square pyramids,  a cornercorner with one Ge(3)O4 tetrahedra, and  a cornercorner with one Ge(4)O4 tetrahedra. In the third Ge site, Ge(3) is bonded to one O(3), one O(6), one O(7), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Yb(1)O6 pentagonal pyramids,  a cornercorner with one Cu(1)O5 square pyramid,  a cornercorner with one Ge(1)O4 tetrahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(12), one O(4), one O(5), and one O(8) atom to form distorted GeO4 tetrahedra that share  a cornercorner with one Yb(1)O6 pentagonal pyramid, corners with two equivalent Cu(1)O5 square pyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Yb(1), one Yb(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Yb(1), one Yb(2), and one Ge(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Yb(1), one Yb(2), and one Ge(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Yb(1), one Yb(2), and one Ge(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Ge(1), and one Ge(4) atom. In the sixth O site, O(6) is bonded in a T-shaped geometry to one Mg(1), one Ge(2), and one Ge(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mg(1), one Ge(1), and one Ge(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Yb(2), one Cu(1), and one Ge(4) atom. In the ninth O site, O(9) is bonded to one Mg(1), one Yb(1), one Cu(1), and one Ge(3) atom to form distorted corner-sharing OYbMgCuGe tetrahedra. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Yb(1), one Cu(1), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Yb(2), one Cu(1), and one Ge(1) atom. In the twelfth O site, O(12) is bonded to one Mg(1), one Cu(1), one Ge(2), and one Ge(4) atom to form distorted corner-sharing OMgCuGe2 tetrahedra. is represented by the CIF card [CIF]
data_Yb2MgCu(GeO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.143
_cell_length_b   7.122
_cell_length_c   8.140
_cell_angle_alpha   66.870
_cell_angle_beta   83.078
_cell_angle_gamma   76.065
_symmetry_Int_Tables_number   1
_cell_volume   266.018
_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
  Yb  Yb0  1  0.010  0.769  0.438  1.0
  Yb  Yb1  1  0.015  0.209  0.574  1.0
  Mg  Mg2  1  0.134  0.572  0.070  1.0
  Cu  Cu3  1  0.005  0.038  0.997  1.0
  Ge  Ge4  1  0.553  0.833  0.796  1.0
  Ge  Ge5  1  0.438  0.137  0.226  1.0
  Ge  Ge6  1  0.579  0.606  0.215  1.0
  Ge  Ge7  1  0.414  0.375  0.801  1.0
  O  O8  1  0.774  0.920  0.623  1.0
  O  O9  1  0.237  0.021  0.403  1.0
  O  O10  1  0.845  0.528  0.353  1.0
  O  O11  1  0.244  0.450  0.608  1.0
  O  O12  1  0.372  0.630  0.832  1.0
  O  O13  1  0.446  0.382  0.242  1.0
  O  O14  1  0.756  0.694  0.998  1.0
  O  O15  1  0.752  0.249  0.811  1.0
  O  O16  1  0.256  0.770  0.174  1.0
  O  O17  1  0.746  0.990  0.194  1.0
  O  O18  1  0.288  0.034  0.814  1.0
  O  O19  1  0.234  0.278  0.022  1.0
[/CIF]
.
The crystal structure described by MgYb2Cu(GeO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(12), one O(3), one O(5), one O(6), one O(7), and one O(9) atom. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(4), and one O(9) atom to form distorted YbO6 pentagonal pyramids that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(4)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(3)O4 tetrahedra, and  an edgeedge with one Cu(1)O5 square pyramid. In the second Yb site, Yb(2) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), and one O(8) atom. Cu(1) is bonded to one O(10), one O(11), one O(12), one O(8), and one O(9) atom to form distorted CuO5 square pyramids that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(4)O4 tetrahedra, and  an edgeedge with one Yb(1)O6 pentagonal pyramid. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(11), one O(5), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Yb(1)O6 pentagonal pyramid,  a cornercorner with one Cu(1)O5 square pyramid,  a cornercorner with one Ge(3)O4 tetrahedra, and  a cornercorner with one Ge(4)O4 tetrahedra. In the second Ge site, Ge(2) is bonded to one O(10), one O(12), one O(2), and one O(6) atom to form GeO4 tetrahedra that share corners with two equivalent Yb(1)O6 pentagonal pyramids, corners with two equivalent Cu(1)O5 square pyramids,  a cornercorner with one Ge(3)O4 tetrahedra, and  a cornercorner with one Ge(4)O4 tetrahedra. In the third Ge site, Ge(3) is bonded to one O(3), one O(6), one O(7), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Yb(1)O6 pentagonal pyramids,  a cornercorner with one Cu(1)O5 square pyramid,  a cornercorner with one Ge(1)O4 tetrahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(12), one O(4), one O(5), and one O(8) atom to form distorted GeO4 tetrahedra that share  a cornercorner with one Yb(1)O6 pentagonal pyramid, corners with two equivalent Cu(1)O5 square pyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Yb(1), one Yb(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Yb(1), one Yb(2), and one Ge(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Yb(1), one Yb(2), and one Ge(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Yb(1), one Yb(2), and one Ge(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Ge(1), and one Ge(4) atom. In the sixth O site, O(6) is bonded in a T-shaped geometry to one Mg(1), one Ge(2), and one Ge(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mg(1), one Ge(1), and one Ge(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Yb(2), one Cu(1), and one Ge(4) atom. In the ninth O site, O(9) is bonded to one Mg(1), one Yb(1), one Cu(1), and one Ge(3) atom to form distorted corner-sharing OYbMgCuGe tetrahedra. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Yb(1), one Cu(1), and one Ge(2) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Yb(2), one Cu(1), and one Ge(1) atom. In the twelfth O site, O(12) is bonded to one Mg(1), one Cu(1), one Ge(2), and one Ge(4) atom to form distorted corner-sharing OMgCuGe2 tetrahedra. is represented by the CIF card [CIF]
data_Yb2MgCu(GeO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.143
_cell_length_b   7.122
_cell_length_c   8.140
_cell_angle_alpha   66.870
_cell_angle_beta   83.078
_cell_angle_gamma   76.065
_symmetry_Int_Tables_number   1
_cell_volume   266.018
_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
  Yb  Yb0  1  0.010  0.769  0.438  1.0
  Yb  Yb1  1  0.015  0.209  0.574  1.0
  Mg  Mg2  1  0.134  0.572  0.070  1.0
  Cu  Cu3  1  0.005  0.038  0.997  1.0
  Ge  Ge4  1  0.553  0.833  0.796  1.0
  Ge  Ge5  1  0.438  0.137  0.226  1.0
  Ge  Ge6  1  0.579  0.606  0.215  1.0
  Ge  Ge7  1  0.414  0.375  0.801  1.0
  O  O8  1  0.774  0.920  0.623  1.0
  O  O9  1  0.237  0.021  0.403  1.0
  O  O10  1  0.845  0.528  0.353  1.0
  O  O11  1  0.244  0.450  0.608  1.0
  O  O12  1  0.372  0.630  0.832  1.0
  O  O13  1  0.446  0.382  0.242  1.0
  O  O14  1  0.756  0.694  0.998  1.0
  O  O15  1  0.752  0.249  0.811  1.0
  O  O16  1  0.256  0.770  0.174  1.0
  O  O17  1  0.746  0.990  0.194  1.0
  O  O18  1  0.288  0.034  0.814  1.0
  O  O19  1  0.234  0.278  0.022  1.0
[/CIF]
.