Zn2Pb4Si3SO15 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(14), one O(2), one O(5), and one O(9) atom to form ZnO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Si(3)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(10), one O(11), one O(3), and one O(8) atom to form ZnO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent Si(2)O4 tetrahedra. There are four inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted T-shaped geometry to one O(10), one O(5), and one O(8) atom. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(15) atoms. In the third Pb site, Pb(3) is bonded in a 2-coordinate geometry to one O(3) and one O(4) atom. In the fourth Pb site, Pb(4) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(13), one O(2), one O(6), and one O(9) atom. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(10), one O(15), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Zn(2)O4 tetrahedra and  a cornercorner with one Si(3)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(11), one O(2), one O(3), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and corners with three equivalent Zn(2)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(14), one O(5), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent Zn(1)O4 tetrahedra. S(1) is bonded in a tetrahedral geometry to one O(1), one O(12), one O(13), and one O(6) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Pb(4) and one S(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Pb(4), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Zn(2), one Pb(3), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Zn(1), one Pb(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one Pb(4) and one S(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Zn(2), one Pb(1), and one Si(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Zn(1), one Pb(4), and one Si(3) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one Zn(2), one Pb(1), and one Si(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Zn(2), one Pb(4), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one S(1) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Pb(4) and one S(1) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Zn(1) and one Si(3) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to two equivalent Pb(2) and one Si(1) atom.
Zn2Pb4Si3SO15 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(14), one O(2), one O(5), and one O(9) atom to form ZnO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Si(3)O4 tetrahedra. The Zn(1)-O(14) bond length is 1.96 Å. The Zn(1)-O(2) bond length is 2.01 Å. The Zn(1)-O(5) bond length is 2.02 Å. The Zn(1)-O(9) bond length is 1.98 Å. In the second Zn site, Zn(2) is bonded to one O(10), one O(11), one O(3), and one O(8) atom to form ZnO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent Si(2)O4 tetrahedra. The Zn(2)-O(10) bond length is 2.04 Å. The Zn(2)-O(11) bond length is 1.98 Å. The Zn(2)-O(3) bond length is 1.95 Å. The Zn(2)-O(8) bond length is 1.97 Å. There are four inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted T-shaped geometry to one O(10), one O(5), and one O(8) atom. The Pb(1)-O(10) bond length is 2.47 Å. The Pb(1)-O(5) bond length is 2.32 Å. The Pb(1)-O(8) bond length is 2.32 Å. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(15) atoms. The Pb(2)-O(4) bond length is 2.45 Å. There is one shorter (2.47 Å) and one longer (2.49 Å) Pb(2)-O(15) bond length. In the third Pb site, Pb(3) is bonded in a 2-coordinate geometry to one O(3) and one O(4) atom. The Pb(3)-O(3) bond length is 2.50 Å. The Pb(3)-O(4) bond length is 2.40 Å. In the fourth Pb site, Pb(4) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(13), one O(2), one O(6), and one O(9) atom. The Pb(4)-O(1) bond length is 2.67 Å. The Pb(4)-O(11) bond length is 2.53 Å. The Pb(4)-O(13) bond length is 2.89 Å. The Pb(4)-O(2) bond length is 2.46 Å. The Pb(4)-O(6) bond length is 2.77 Å. The Pb(4)-O(9) bond length is 2.51 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(10), one O(15), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Zn(2)O4 tetrahedra and  a cornercorner with one Si(3)O4 tetrahedra. The Si(1)-O(10) bond length is 1.66 Å. The Si(1)-O(15) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.63 Å. The Si(1)-O(7) bond length is 1.68 Å. In the second Si site, Si(2) is bonded to one O(11), one O(2), one O(3), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and corners with three equivalent Zn(2)O4 tetrahedra. The Si(2)-O(11) bond length is 1.64 Å. The Si(2)-O(2) bond length is 1.66 Å. The Si(2)-O(3) bond length is 1.66 Å. The Si(2)-O(8) bond length is 1.65 Å. In the third Si site, Si(3) is bonded to one O(14), one O(5), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent Zn(1)O4 tetrahedra. The Si(3)-O(14) bond length is 1.63 Å. The Si(3)-O(5) bond length is 1.65 Å. The Si(3)-O(7) bond length is 1.68 Å. The Si(3)-O(9) bond length is 1.65 Å. S(1) is bonded in a tetrahedral geometry to one O(1), one O(12), one O(13), and one O(6) atom. The S(1)-O(1) bond length is 1.50 Å. The S(1)-O(12) bond length is 1.47 Å. The S(1)-O(13) bond length is 1.50 Å. The S(1)-O(6) bond length is 1.51 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Pb(4) and one S(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Pb(4), and one Si(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Zn(2), one Pb(3), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Pb(2), one Pb(3), and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Zn(1), one Pb(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one Pb(4) and one S(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Zn(2), one Pb(1), and one Si(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Zn(1), one Pb(4), and one Si(3) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one Zn(2), one Pb(1), and one Si(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Zn(2), one Pb(4), and one Si(2) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one S(1) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Pb(4) and one S(1) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Zn(1) and one Si(3) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to two equivalent Pb(2) and one Si(1) atom.