MgFeCuPbAs2O10 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(5), one O(7), and one O(9) atom to form MgO5 trigonal bipyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 53°. Fe(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form FeO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(7), and one O(8) atom. Pb(1) is bonded in a 4-coordinate geometry to one O(10), one O(3), one O(6), and one O(8) atom. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(3), one O(6), one O(8), and one O(9) atom to form AsO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 37-53°. In the second As site, As(2) is bonded to one O(10), one O(4), one O(5), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 33-56°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1), one Fe(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Mg(1), one Fe(1), and one Cu(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Fe(1), one Pb(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Fe(1) and one As(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one Fe(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(1), one Pb(1), and one As(1) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Mg(1), one Cu(1), and one As(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Cu(1), one Pb(1), and one As(1) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Mg(1) and one As(1) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one Pb(1) and one As(2) atom.
MgFeCuPbAs2O10 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(5), one O(7), and one O(9) atom to form MgO5 trigonal bipyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 53°. The Mg(1)-O(1) bond length is 1.98 Å. The Mg(1)-O(2) bond length is 2.07 Å. The Mg(1)-O(5) bond length is 2.09 Å. The Mg(1)-O(7) bond length is 2.11 Å. The Mg(1)-O(9) bond length is 2.07 Å. Fe(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form FeO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The Fe(1)-O(1) bond length is 1.95 Å. The Fe(1)-O(2) bond length is 1.93 Å. The Fe(1)-O(3) bond length is 2.12 Å. The Fe(1)-O(4) bond length is 2.08 Å. The Fe(1)-O(5) bond length is 2.09 Å. The Fe(1)-O(6) bond length is 2.05 Å. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(7), and one O(8) atom. The Cu(1)-O(1) bond length is 1.85 Å. The Cu(1)-O(2) bond length is 1.82 Å. The Cu(1)-O(7) bond length is 1.89 Å. The Cu(1)-O(8) bond length is 1.91 Å. Pb(1) is bonded in a 4-coordinate geometry to one O(10), one O(3), one O(6), and one O(8) atom. The Pb(1)-O(10) bond length is 2.39 Å. The Pb(1)-O(3) bond length is 2.68 Å. The Pb(1)-O(6) bond length is 2.42 Å. The Pb(1)-O(8) bond length is 2.43 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(3), one O(6), one O(8), and one O(9) atom to form AsO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 37-53°. The As(1)-O(3) bond length is 1.73 Å. The As(1)-O(6) bond length is 1.73 Å. The As(1)-O(8) bond length is 1.76 Å. The As(1)-O(9) bond length is 1.69 Å. In the second As site, As(2) is bonded to one O(10), one O(4), one O(5), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 33-56°. The As(2)-O(10) bond length is 1.69 Å. The As(2)-O(4) bond length is 1.72 Å. The As(2)-O(5) bond length is 1.73 Å. The As(2)-O(7) bond length is 1.76 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1), one Fe(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Mg(1), one Fe(1), and one Cu(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Fe(1), one Pb(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Fe(1) and one As(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one Fe(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(1), one Pb(1), and one As(1) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Mg(1), one Cu(1), and one As(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Cu(1), one Pb(1), and one As(1) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Mg(1) and one As(1) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one Pb(1) and one As(2) atom.