SrCa3(PbO4)2 crystallizes in the monoclinic Pm space group. Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), two equivalent O(5), and two equivalent O(7) atoms. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), two equivalent O(6), and two equivalent O(8) atoms. In the second Ca site, Ca(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), two equivalent O(5), and two equivalent O(7) atoms. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(6), and two equivalent O(8) atoms. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to one O(7), one O(8), two equivalent O(1), and two equivalent O(2) atoms to form edge-sharing PbO6 octahedra. In the second Pb site, Pb(2) is bonded to one O(5), one O(6), two equivalent O(3), and two equivalent O(4) atoms to form edge-sharing PbO6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Ca(2), one Ca(3), and two equivalent Pb(1) atoms to form distorted OSrCa2Pb2 trigonal bipyramids that share corners with two equivalent O(6)Ca4Pb square pyramids, corners with two equivalent O(2)Ca3Pb2 trigonal bipyramids, corners with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids,  a cornercorner with one O(3)SrCaPb2 trigonal pyramid, edges with two equivalent O(8)Ca4Pb square pyramids, edges with two equivalent O(2)Ca3Pb2 trigonal bipyramids, edges with two equivalent O(5)Sr2Ca2Pb trigonal bipyramids, and edges with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids. In the second O site, O(2) is bonded to one Ca(1), one Ca(2), one Ca(3), and two equivalent Pb(1) atoms to form distorted OCa3Pb2 trigonal bipyramids that share corners with two equivalent O(8)Ca4Pb square pyramids, corners with two equivalent O(2)Ca3Pb2 trigonal bipyramids, corners with two equivalent O(5)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids,  a cornercorner with one O(3)SrCaPb2 trigonal pyramid, edges with two equivalent O(6)Ca4Pb square pyramids, edges with two equivalent O(8)Ca4Pb square pyramids, edges with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, and edges with two equivalent O(1)SrCa2Pb2 trigonal bipyramids. In the third O site, O(3) is bonded to one Sr(1), one Ca(1), and two equivalent Pb(2) atoms to form distorted OSrCaPb2 trigonal pyramids that share corners with two equivalent O(8)Ca4Pb square pyramids,  a cornercorner with one O(2)Ca3Pb2 trigonal bipyramid,  a cornercorner with one O(1)SrCa2Pb2 trigonal bipyramid, corners with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids, corners with four equivalent O(5)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(3)SrCaPb2 trigonal pyramids, edges with two equivalent O(6)Ca4Pb square pyramids, and edges with two equivalent O(4)SrCa2Pb2 trigonal bipyramids. In the fourth O site, O(4) is bonded to one Sr(1), one Ca(1), one Ca(3), and two equivalent Pb(2) atoms to form distorted OSrCa2Pb2 trigonal bipyramids that share corners with two equivalent O(6)Ca4Pb square pyramids, corners with two equivalent O(2)Ca3Pb2 trigonal bipyramids, corners with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(3)SrCaPb2 trigonal pyramids, edges with two equivalent O(6)Ca4Pb square pyramids, edges with two equivalent O(8)Ca4Pb square pyramids, edges with two equivalent O(5)Sr2Ca2Pb trigonal bipyramids, and edges with two equivalent O(3)SrCaPb2 trigonal pyramids. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent Ca(2), and one Pb(2) atom to form distorted OSr2Ca2Pb trigonal bipyramids that share  a cornercorner with one O(6)Ca4Pb square pyramid, corners with two equivalent O(2)Ca3Pb2 trigonal bipyramids, corners with four equivalent O(7)Sr2Ca2Pb trigonal bipyramids, corners with four equivalent O(3)SrCaPb2 trigonal pyramids, edges with two equivalent O(5)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, and edges with two equivalent O(4)SrCa2Pb2 trigonal bipyramids. In the sixth O site, O(6) is bonded to two equivalent Ca(1), two equivalent Ca(3), and one Pb(2) atom to form distorted OCa4Pb square pyramids that share corners with four equivalent O(8)Ca4Pb square pyramids,  a cornercorner with one O(5)Sr2Ca2Pb trigonal bipyramid, corners with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids, edges with two equivalent O(6)Ca4Pb square pyramids, edges with two equivalent O(8)Ca4Pb square pyramids, edges with two equivalent O(2)Ca3Pb2 trigonal bipyramids, edges with two equivalent O(4)SrCa2Pb2 trigonal bipyramids, and edges with two equivalent O(3)SrCaPb2 trigonal pyramids. In the seventh O site, O(7) is bonded to two equivalent Sr(1), two equivalent Ca(2), and one Pb(1) atom to form distorted OSr2Ca2Pb trigonal bipyramids that share  a cornercorner with one O(8)Ca4Pb square pyramid, corners with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids, corners with four equivalent O(5)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(3)SrCaPb2 trigonal pyramids, edges with two equivalent O(2)Ca3Pb2 trigonal bipyramids, edges with two equivalent O(5)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, and edges with two equivalent O(1)SrCa2Pb2 trigonal bipyramids. In the eighth O site, O(8) is bonded to two equivalent Ca(1), two equivalent Ca(3), and one Pb(1) atom to form distorted OCa4Pb square pyramids that share corners with four equivalent O(6)Ca4Pb square pyramids,  a cornercorner with one O(7)Sr2Ca2Pb trigonal bipyramid, corners with two equivalent O(2)Ca3Pb2 trigonal bipyramids, corners with two equivalent O(3)SrCaPb2 trigonal pyramids, edges with two equivalent O(6)Ca4Pb square pyramids, edges with two equivalent O(8)Ca4Pb square pyramids, edges with two equivalent O(2)Ca3Pb2 trigonal bipyramids, edges with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, and edges with two equivalent O(4)SrCa2Pb2 trigonal bipyramids.
SrCa3(PbO4)2 crystallizes in the monoclinic Pm space group. Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), two equivalent O(5), and two equivalent O(7) atoms. The Sr(1)-O(1) bond length is 2.92 Å. The Sr(1)-O(3) bond length is 2.46 Å. The Sr(1)-O(4) bond length is 2.63 Å. Both Sr(1)-O(5) bond lengths are 2.52 Å. Both Sr(1)-O(7) bond lengths are 2.53 Å. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), two equivalent O(6), and two equivalent O(8) atoms. The Ca(1)-O(2) bond length is 2.79 Å. The Ca(1)-O(3) bond length is 2.51 Å. The Ca(1)-O(4) bond length is 2.40 Å. Both Ca(1)-O(6) bond lengths are 2.43 Å. Both Ca(1)-O(8) bond lengths are 2.43 Å. In the second Ca site, Ca(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), two equivalent O(5), and two equivalent O(7) atoms. The Ca(2)-O(1) bond length is 2.37 Å. The Ca(2)-O(2) bond length is 2.54 Å. Both Ca(2)-O(5) bond lengths are 2.43 Å. Both Ca(2)-O(7) bond lengths are 2.41 Å. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(6), and two equivalent O(8) atoms. The Ca(3)-O(1) bond length is 2.55 Å. The Ca(3)-O(2) bond length is 2.39 Å. The Ca(3)-O(4) bond length is 2.80 Å. Both Ca(3)-O(6) bond lengths are 2.42 Å. Both Ca(3)-O(8) bond lengths are 2.44 Å. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to one O(7), one O(8), two equivalent O(1), and two equivalent O(2) atoms to form edge-sharing PbO6 octahedra. The Pb(1)-O(7) bond length is 2.15 Å. The Pb(1)-O(8) bond length is 2.15 Å. Both Pb(1)-O(1) bond lengths are 2.30 Å. Both Pb(1)-O(2) bond lengths are 2.29 Å. In the second Pb site, Pb(2) is bonded to one O(5), one O(6), two equivalent O(3), and two equivalent O(4) atoms to form edge-sharing PbO6 octahedra. The Pb(2)-O(5) bond length is 2.18 Å. The Pb(2)-O(6) bond length is 2.17 Å. Both Pb(2)-O(3) bond lengths are 2.27 Å. Both Pb(2)-O(4) bond lengths are 2.29 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Ca(2), one Ca(3), and two equivalent Pb(1) atoms to form distorted OSrCa2Pb2 trigonal bipyramids that share corners with two equivalent O(6)Ca4Pb square pyramids, corners with two equivalent O(2)Ca3Pb2 trigonal bipyramids, corners with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids,  a cornercorner with one O(3)SrCaPb2 trigonal pyramid, edges with two equivalent O(8)Ca4Pb square pyramids, edges with two equivalent O(2)Ca3Pb2 trigonal bipyramids, edges with two equivalent O(5)Sr2Ca2Pb trigonal bipyramids, and edges with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids. In the second O site, O(2) is bonded to one Ca(1), one Ca(2), one Ca(3), and two equivalent Pb(1) atoms to form distorted OCa3Pb2 trigonal bipyramids that share corners with two equivalent O(8)Ca4Pb square pyramids, corners with two equivalent O(2)Ca3Pb2 trigonal bipyramids, corners with two equivalent O(5)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids,  a cornercorner with one O(3)SrCaPb2 trigonal pyramid, edges with two equivalent O(6)Ca4Pb square pyramids, edges with two equivalent O(8)Ca4Pb square pyramids, edges with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, and edges with two equivalent O(1)SrCa2Pb2 trigonal bipyramids. In the third O site, O(3) is bonded to one Sr(1), one Ca(1), and two equivalent Pb(2) atoms to form distorted OSrCaPb2 trigonal pyramids that share corners with two equivalent O(8)Ca4Pb square pyramids,  a cornercorner with one O(2)Ca3Pb2 trigonal bipyramid,  a cornercorner with one O(1)SrCa2Pb2 trigonal bipyramid, corners with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids, corners with four equivalent O(5)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(3)SrCaPb2 trigonal pyramids, edges with two equivalent O(6)Ca4Pb square pyramids, and edges with two equivalent O(4)SrCa2Pb2 trigonal bipyramids. In the fourth O site, O(4) is bonded to one Sr(1), one Ca(1), one Ca(3), and two equivalent Pb(2) atoms to form distorted OSrCa2Pb2 trigonal bipyramids that share corners with two equivalent O(6)Ca4Pb square pyramids, corners with two equivalent O(2)Ca3Pb2 trigonal bipyramids, corners with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(3)SrCaPb2 trigonal pyramids, edges with two equivalent O(6)Ca4Pb square pyramids, edges with two equivalent O(8)Ca4Pb square pyramids, edges with two equivalent O(5)Sr2Ca2Pb trigonal bipyramids, and edges with two equivalent O(3)SrCaPb2 trigonal pyramids. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent Ca(2), and one Pb(2) atom to form distorted OSr2Ca2Pb trigonal bipyramids that share  a cornercorner with one O(6)Ca4Pb square pyramid, corners with two equivalent O(2)Ca3Pb2 trigonal bipyramids, corners with four equivalent O(7)Sr2Ca2Pb trigonal bipyramids, corners with four equivalent O(3)SrCaPb2 trigonal pyramids, edges with two equivalent O(5)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, and edges with two equivalent O(4)SrCa2Pb2 trigonal bipyramids. In the sixth O site, O(6) is bonded to two equivalent Ca(1), two equivalent Ca(3), and one Pb(2) atom to form distorted OCa4Pb square pyramids that share corners with four equivalent O(8)Ca4Pb square pyramids,  a cornercorner with one O(5)Sr2Ca2Pb trigonal bipyramid, corners with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids, edges with two equivalent O(6)Ca4Pb square pyramids, edges with two equivalent O(8)Ca4Pb square pyramids, edges with two equivalent O(2)Ca3Pb2 trigonal bipyramids, edges with two equivalent O(4)SrCa2Pb2 trigonal bipyramids, and edges with two equivalent O(3)SrCaPb2 trigonal pyramids. In the seventh O site, O(7) is bonded to two equivalent Sr(1), two equivalent Ca(2), and one Pb(1) atom to form distorted OSr2Ca2Pb trigonal bipyramids that share  a cornercorner with one O(8)Ca4Pb square pyramid, corners with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, corners with two equivalent O(4)SrCa2Pb2 trigonal bipyramids, corners with four equivalent O(5)Sr2Ca2Pb trigonal bipyramids, corners with two equivalent O(3)SrCaPb2 trigonal pyramids, edges with two equivalent O(2)Ca3Pb2 trigonal bipyramids, edges with two equivalent O(5)Sr2Ca2Pb trigonal bipyramids, edges with two equivalent O(7)Sr2Ca2Pb trigonal bipyramids, and edges with two equivalent O(1)SrCa2Pb2 trigonal bipyramids. In the eighth O site, O(8) is bonded to two equivalent Ca(1), two equivalent Ca(3), and one Pb(1) atom to form distorted OCa4Pb square pyramids that share corners with four equivalent O(6)Ca4Pb square pyramids,  a cornercorner with one O(7)Sr2Ca2Pb trigonal bipyramid, corners with two equivalent O(2)Ca3Pb2 trigonal bipyramids, corners with two equivalent O(3)SrCaPb2 trigonal pyramids, edges with two equivalent O(6)Ca4Pb square pyramids, edges with two equivalent O(8)Ca4Pb square pyramids, edges with two equivalent O(2)Ca3Pb2 trigonal bipyramids, edges with two equivalent O(1)SrCa2Pb2 trigonal bipyramids, and edges with two equivalent O(4)SrCa2Pb2 trigonal bipyramids.