The material described by MgAg3(AsO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(4), one O(5), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, corners with two equivalent Ag(2)O5 trigonal bipyramids, and  an edgeedge with one As(1)O4 tetrahedra. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), one O(6), and one O(8) atom. In the second Ag site, Ag(2) is bonded to one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form distorted AgO5 trigonal bipyramids that share  a cornercorner with one As(2)O4 tetrahedra, corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, and  an edgeedge with one As(2)O4 tetrahedra. In the third Ag site, Ag(3) is bonded in a distorted see-saw-like geometry to one O(1), one O(3), one O(6), and one O(7) atom. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid, corners with two equivalent Ag(2)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the second As site, As(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one Ag(2)O5 trigonal bipyramid, corners with two equivalent Mg(1)O5 trigonal bipyramids, and  an edgeedge with one Ag(2)O5 trigonal bipyramid. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Ag(1), one Ag(3), and one As(1) atom to form OMgAg2As trigonal pyramids that share  a cornercorner with one O(8)MgAg2As tetrahedra, corners with two equivalent O(6)Ag3As tetrahedra, and  an edgeedge with one O(8)MgAg2As tetrahedra. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Mg(1) and one As(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ag(2), one Ag(3), and one As(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Ag(1), and one As(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Ag(2), and one As(2) atom. In the sixth O site, O(6) is bonded to one Ag(1), one Ag(2), one Ag(3), and one As(2) atom to form corner-sharing OAg3As tetrahedra. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ag(2), one Ag(3), and one As(1) atom. In the eighth O site, O(8) is bonded to one Mg(1), one Ag(1), one Ag(2), and one As(1) atom to form distorted OMgAg2As tetrahedra that share corners with two equivalent O(6)Ag3As tetrahedra,  a cornercorner with one O(1)MgAg2As trigonal pyramid, and  an edgeedge with one O(1)MgAg2As trigonal pyramid. is represented by the CIF file [CIF]
data_MgAg3(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.750
_cell_length_b   5.714
_cell_length_c   6.712
_cell_angle_alpha   88.448
_cell_angle_beta   86.409
_cell_angle_gamma   87.665
_symmetry_Int_Tables_number   1
_cell_volume   219.853
_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  0.040  0.532  0.206  1.0
  Ag  Ag1  1  0.521  0.775  0.003  1.0
  Ag  Ag2  1  0.724  0.023  0.504  1.0
  Ag  Ag3  1  0.003  0.471  0.711  1.0
  As  As4  1  0.990  0.007  0.014  1.0
  As  As5  1  0.507  0.507  0.492  1.0
  O  O6  1  0.146  0.749  0.939  1.0
  O  O7  1  0.151  0.215  0.109  1.0
  O  O8  1  0.364  0.291  0.624  1.0
  O  O9  1  0.319  0.652  0.337  1.0
  O  O10  1  0.752  0.382  0.358  1.0
  O  O11  1  0.638  0.692  0.653  1.0
  O  O12  1  0.816  0.124  0.836  1.0
  O  O13  1  0.820  0.852  0.202  1.0
[/CIF]
.
The material described by MgAg3(AsO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(4), one O(5), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, corners with two equivalent Ag(2)O5 trigonal bipyramids, and  an edgeedge with one As(1)O4 tetrahedra. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to one O(1), one O(4), one O(6), and one O(8) atom. In the second Ag site, Ag(2) is bonded to one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form distorted AgO5 trigonal bipyramids that share  a cornercorner with one As(2)O4 tetrahedra, corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, and  an edgeedge with one As(2)O4 tetrahedra. In the third Ag site, Ag(3) is bonded in a distorted see-saw-like geometry to one O(1), one O(3), one O(6), and one O(7) atom. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form AsO4 tetrahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid, corners with two equivalent Ag(2)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the second As site, As(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one Ag(2)O5 trigonal bipyramid, corners with two equivalent Mg(1)O5 trigonal bipyramids, and  an edgeedge with one Ag(2)O5 trigonal bipyramid. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Ag(1), one Ag(3), and one As(1) atom to form OMgAg2As trigonal pyramids that share  a cornercorner with one O(8)MgAg2As tetrahedra, corners with two equivalent O(6)Ag3As tetrahedra, and  an edgeedge with one O(8)MgAg2As tetrahedra. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Mg(1) and one As(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ag(2), one Ag(3), and one As(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Ag(1), and one As(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Ag(2), and one As(2) atom. In the sixth O site, O(6) is bonded to one Ag(1), one Ag(2), one Ag(3), and one As(2) atom to form corner-sharing OAg3As tetrahedra. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ag(2), one Ag(3), and one As(1) atom. In the eighth O site, O(8) is bonded to one Mg(1), one Ag(1), one Ag(2), and one As(1) atom to form distorted OMgAg2As tetrahedra that share corners with two equivalent O(6)Ag3As tetrahedra,  a cornercorner with one O(1)MgAg2As trigonal pyramid, and  an edgeedge with one O(1)MgAg2As trigonal pyramid. is represented by the CIF file [CIF]
data_MgAg3(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.750
_cell_length_b   5.714
_cell_length_c   6.712
_cell_angle_alpha   88.448
_cell_angle_beta   86.409
_cell_angle_gamma   87.665
_symmetry_Int_Tables_number   1
_cell_volume   219.853
_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  0.040  0.532  0.206  1.0
  Ag  Ag1  1  0.521  0.775  0.003  1.0
  Ag  Ag2  1  0.724  0.023  0.504  1.0
  Ag  Ag3  1  0.003  0.471  0.711  1.0
  As  As4  1  0.990  0.007  0.014  1.0
  As  As5  1  0.507  0.507  0.492  1.0
  O  O6  1  0.146  0.749  0.939  1.0
  O  O7  1  0.151  0.215  0.109  1.0
  O  O8  1  0.364  0.291  0.624  1.0
  O  O9  1  0.319  0.652  0.337  1.0
  O  O10  1  0.752  0.382  0.358  1.0
  O  O11  1  0.638  0.692  0.653  1.0
  O  O12  1  0.816  0.124  0.836  1.0
  O  O13  1  0.820  0.852  0.202  1.0
[/CIF]
.