MgGe4(BiO6)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 4-coordinate geometry to one O(10), one O(11), one O(2), and one O(8) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(4), one O(8), and one O(9) atom to form corner-sharing GeO4 tetrahedra. In the second Ge site, Ge(2) is bonded to one O(10), one O(2), one O(3), and one O(7) atom to form corner-sharing GeO4 tetrahedra. In the third Ge site, Ge(3) is bonded to one O(11), one O(2), one O(3), and one O(6) atom to form corner-sharing GeO4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one O(1), one O(12), one O(4), and one O(5) atom to form corner-sharing GeO4 tetrahedra. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a distorted rectangular see-saw-like geometry to one O(12), one O(7), one O(8), and one O(9) atom. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to one O(10), one O(11), one O(5), and one O(6) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(4) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Ge(2), and one Ge(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Ge(2) and one Ge(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ge(1) and one Ge(4) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ge(4) and one Bi(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ge(3) and one Bi(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Ge(2) and one Bi(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Mg(1), one Ge(1), and one Bi(1) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Ge(1) and one Bi(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mg(1), one Ge(2), and one Bi(2) atom. In the eleventh O site, O(11) is bonded in a distorted L-shaped geometry to one Mg(1), one Ge(3), and one Bi(2) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Ge(4) and one Bi(1) atom.
MgGe4(BiO6)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 4-coordinate geometry to one O(10), one O(11), one O(2), and one O(8) atom. The Mg(1)-O(10) bond length is 1.94 Å. The Mg(1)-O(11) bond length is 1.99 Å. The Mg(1)-O(2) bond length is 2.22 Å. The Mg(1)-O(8) bond length is 1.88 Å. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(4), one O(8), and one O(9) atom to form corner-sharing GeO4 tetrahedra. The Ge(1)-O(1) bond length is 1.78 Å. The Ge(1)-O(4) bond length is 1.80 Å. The Ge(1)-O(8) bond length is 1.75 Å. The Ge(1)-O(9) bond length is 1.78 Å. In the second Ge site, Ge(2) is bonded to one O(10), one O(2), one O(3), and one O(7) atom to form corner-sharing GeO4 tetrahedra. The Ge(2)-O(10) bond length is 1.80 Å. The Ge(2)-O(2) bond length is 1.86 Å. The Ge(2)-O(3) bond length is 1.77 Å. The Ge(2)-O(7) bond length is 1.72 Å. In the third Ge site, Ge(3) is bonded to one O(11), one O(2), one O(3), and one O(6) atom to form corner-sharing GeO4 tetrahedra. The Ge(3)-O(11) bond length is 1.78 Å. The Ge(3)-O(2) bond length is 1.88 Å. The Ge(3)-O(3) bond length is 1.77 Å. The Ge(3)-O(6) bond length is 1.74 Å. In the fourth Ge site, Ge(4) is bonded to one O(1), one O(12), one O(4), and one O(5) atom to form corner-sharing GeO4 tetrahedra. The Ge(4)-O(1) bond length is 1.78 Å. The Ge(4)-O(12) bond length is 1.77 Å. The Ge(4)-O(4) bond length is 1.79 Å. The Ge(4)-O(5) bond length is 1.76 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a distorted rectangular see-saw-like geometry to one O(12), one O(7), one O(8), and one O(9) atom. The Bi(1)-O(12) bond length is 2.13 Å. The Bi(1)-O(7) bond length is 2.17 Å. The Bi(1)-O(8) bond length is 2.65 Å. The Bi(1)-O(9) bond length is 2.22 Å. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to one O(10), one O(11), one O(5), and one O(6) atom. The Bi(2)-O(10) bond length is 2.19 Å. The Bi(2)-O(11) bond length is 2.59 Å. The Bi(2)-O(5) bond length is 2.13 Å. The Bi(2)-O(6) bond length is 2.23 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(4) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Ge(2), and one Ge(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Ge(2) and one Ge(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ge(1) and one Ge(4) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ge(4) and one Bi(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ge(3) and one Bi(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Ge(2) and one Bi(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Mg(1), one Ge(1), and one Bi(1) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Ge(1) and one Bi(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mg(1), one Ge(2), and one Bi(2) atom. In the eleventh O site, O(11) is bonded in a distorted L-shaped geometry to one Mg(1), one Ge(3), and one Bi(2) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Ge(4) and one Bi(1) atom.