The material described by MgV2Zn2(SiO5)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(4), one O(5), and one O(8) atom. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(10), one O(2), one O(4), one O(5), one O(7), and one O(9) atom to form VO6 octahedra that share corners with two equivalent V(2)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent Zn(2)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 42-44°. In the second V site, V(2) is bonded to one O(1), one O(10), one O(3), one O(6), one O(8), and one O(9) atom to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Zn(2)O4 trigonal pyramid, and  an edgeedge with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 42-44°. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(2), one O(6), and one O(7) atom. In the second Zn site, Zn(2) is bonded to one O(1), one O(3), one O(5), and one O(9) atom to form distorted ZnO4 trigonal pyramids that share  a cornercorner with one V(2)O6 octahedra, corners with two equivalent V(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-73°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, and  a cornercorner with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 20-60°. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, and corners with two equivalent Zn(2)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 45-58°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one V(2), one Zn(2), and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one V(1), one Zn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one V(2), one Zn(2), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one V(1), and one Si(2) atom. In the fifth O site, O(5) is bonded to one Mg(1), one V(1), one Zn(2), and one Si(2) atom to form distorted edge-sharing OMgVZnSi trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one V(2), one Zn(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one V(1), one Zn(1), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one Si(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one V(1), one V(2), and one Zn(2) atom. In the tenth O site, O(10) is bonded to one Mg(1), one V(1), one V(2), and one Zn(1) atom to form edge-sharing OMgV2Zn trigonal pyramids. is represented by the CIF file [CIF]
data_MgV2Zn2(SiO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.619
_cell_length_b   7.343
_cell_length_c   8.286
_cell_angle_alpha   90.287
_cell_angle_beta   39.568
_cell_angle_gamma   106.866
_symmetry_Int_Tables_number   1
_cell_volume   194.552
_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  0.136  0.367  0.250  1.0
  V  V1  1  0.498  0.511  0.478  1.0
  V  V2  1  0.456  0.991  0.527  1.0
  Zn  Zn3  1  0.826  0.221  0.041  1.0
  Zn  Zn4  1  0.608  0.804  0.742  1.0
  Si  Si5  1  0.544  0.238  0.819  1.0
  Si  Si6  1  0.444  0.772  0.184  1.0
  O  O7  1  0.734  0.115  0.609  1.0
  O  O8  1  0.489  0.405  0.729  1.0
  O  O9  1  0.219  0.874  0.421  1.0
  O  O10  1  0.463  0.573  0.256  1.0
  O  O11  1  0.198  0.669  0.138  1.0
  O  O12  1  0.892  0.964  0.899  1.0
  O  O13  1  0.850  0.354  0.816  1.0
  O  O14  1  0.096  0.107  0.140  1.0
  O  O15  1  0.450  0.742  0.599  1.0
  O  O16  1  0.619  0.279  0.355  1.0
[/CIF]
.
The material described by MgV2Zn2(SiO5)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(4), one O(5), and one O(8) atom. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(10), one O(2), one O(4), one O(5), one O(7), and one O(9) atom to form VO6 octahedra that share corners with two equivalent V(2)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent Zn(2)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 42-44°. In the second V site, V(2) is bonded to one O(1), one O(10), one O(3), one O(6), one O(8), and one O(9) atom to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Zn(2)O4 trigonal pyramid, and  an edgeedge with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 42-44°. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(2), one O(6), and one O(7) atom. In the second Zn site, Zn(2) is bonded to one O(1), one O(3), one O(5), and one O(9) atom to form distorted ZnO4 trigonal pyramids that share  a cornercorner with one V(2)O6 octahedra, corners with two equivalent V(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-73°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, and  a cornercorner with one Zn(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 20-60°. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent V(2)O6 octahedra, and corners with two equivalent Zn(2)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 45-58°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mg(1), one V(2), one Zn(2), and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one V(1), one Zn(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one V(2), one Zn(2), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one V(1), and one Si(2) atom. In the fifth O site, O(5) is bonded to one Mg(1), one V(1), one Zn(2), and one Si(2) atom to form distorted edge-sharing OMgVZnSi trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one V(2), one Zn(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one V(1), one Zn(1), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one Si(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one V(1), one V(2), and one Zn(2) atom. In the tenth O site, O(10) is bonded to one Mg(1), one V(1), one V(2), and one Zn(1) atom to form edge-sharing OMgV2Zn trigonal pyramids. is represented by the CIF file [CIF]
data_MgV2Zn2(SiO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.619
_cell_length_b   7.343
_cell_length_c   8.286
_cell_angle_alpha   90.287
_cell_angle_beta   39.568
_cell_angle_gamma   106.866
_symmetry_Int_Tables_number   1
_cell_volume   194.552
_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  0.136  0.367  0.250  1.0
  V  V1  1  0.498  0.511  0.478  1.0
  V  V2  1  0.456  0.991  0.527  1.0
  Zn  Zn3  1  0.826  0.221  0.041  1.0
  Zn  Zn4  1  0.608  0.804  0.742  1.0
  Si  Si5  1  0.544  0.238  0.819  1.0
  Si  Si6  1  0.444  0.772  0.184  1.0
  O  O7  1  0.734  0.115  0.609  1.0
  O  O8  1  0.489  0.405  0.729  1.0
  O  O9  1  0.219  0.874  0.421  1.0
  O  O10  1  0.463  0.573  0.256  1.0
  O  O11  1  0.198  0.669  0.138  1.0
  O  O12  1  0.892  0.964  0.899  1.0
  O  O13  1  0.850  0.354  0.816  1.0
  O  O14  1  0.096  0.107  0.140  1.0
  O  O15  1  0.450  0.742  0.599  1.0
  O  O16  1  0.619  0.279  0.355  1.0
[/CIF]
.