Er3Pb4F17 crystallizes in the triclinic P1 space group. There are six inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to one F(11), one F(12), one F(14), one F(32), one F(33), one F(4), one F(6), and one F(9) atom. In the second Er site, Er(2) is bonded in a 8-coordinate geometry to one F(15), one F(17), one F(22), one F(26), one F(28), one F(7), one F(8), and one F(9) atom. In the third Er site, Er(3) is bonded in a 9-coordinate geometry to one F(11), one F(13), one F(15), one F(18), one F(19), one F(20), one F(23), one F(24), and one F(31) atom. In the fourth Er site, Er(4) is bonded in a 8-coordinate geometry to one F(12), one F(13), one F(16), one F(17), one F(21), one F(23), one F(25), and one F(5) atom. In the fifth Er site, Er(5) is bonded in a 9-coordinate geometry to one F(10), one F(14), one F(18), one F(19), one F(21), one F(27), one F(28), one F(29), and one F(8) atom. In the sixth Er site, Er(6) is bonded in a 9-coordinate geometry to one F(19), one F(22), one F(24), one F(25), one F(27), one F(3), one F(30), one F(32), and one F(4) atom. There are eight inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 8-coordinate geometry to one F(1), one F(2), one F(20), one F(30), one F(31), one F(32), one F(5), and one F(7) atom. In the second Pb site, Pb(2) is bonded in a 7-coordinate geometry to one F(10), one F(13), one F(2), one F(3), one F(4), one F(5), and one F(8) atom. In the third Pb site, Pb(3) is bonded in a 7-coordinate geometry to one F(10), one F(16), one F(2), one F(23), one F(26), one F(6), and one F(7) atom. In the fourth Pb site, Pb(4) is bonded in a 8-coordinate geometry to one F(1), one F(16), one F(3), one F(30), one F(33), one F(34), one F(7), and one F(8) atom. In the fifth Pb site, Pb(5) is bonded in a 7-coordinate geometry to one F(2), one F(20), one F(28), one F(29), one F(3), one F(33), and one F(6) atom. In the sixth Pb site, Pb(6) is bonded in a 8-coordinate geometry to one F(1), one F(10), one F(13), one F(20), one F(26), one F(29), one F(30), and one F(34) atom. In the seventh Pb site, Pb(7) is bonded in a 7-coordinate geometry to one F(23), one F(26), one F(28), one F(31), one F(32), one F(33), and one F(34) atom. In the eighth Pb site, Pb(8) is bonded in a 7-coordinate geometry to one F(16), one F(29), one F(31), one F(34), one F(4), one F(5), and one F(6) atom. There are thirty-four inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one Pb(1), one Pb(4), and one Pb(6) atom. In the second F site, F(2) is bonded to one Pb(1), one Pb(2), one Pb(3), and one Pb(5) atom to form FPb4 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  an edgeedge with one F(10)ErPb3 tetrahedra,  an edgeedge with one F(20)ErPb3 tetrahedra,  an edgeedge with one F(3)ErPb3 tetrahedra,  an edgeedge with one F(5)ErPb3 tetrahedra,  an edgeedge with one F(6)ErPb3 tetrahedra, and  an edgeedge with one F(7)ErPb3 tetrahedra. In the third F site, F(3) is bonded to one Er(6), one Pb(2), one Pb(4), and one Pb(5) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(4)Er2Pb2 tetrahedra,  an edgeedge with one F(8)Er2Pb2 tetrahedra,  an edgeedge with one F(30)ErPb3 tetrahedra,  an edgeedge with one F(33)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the fourth F site, F(4) is bonded to one Er(1), one Er(6), one Pb(2), and one Pb(8) atom to form FEr2Pb2 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(32)Er2Pb2 tetrahedra,  an edgeedge with one F(3)ErPb3 tetrahedra,  an edgeedge with one F(5)ErPb3 tetrahedra, and  an edgeedge with one F(6)ErPb3 tetrahedra. In the fifth F site, F(5) is bonded to one Er(4), one Pb(1), one Pb(2), and one Pb(8) atom to form distorted FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(13)Er2Pb2 tetrahedra,  an edgeedge with one F(4)Er2Pb2 tetrahedra,  an edgeedge with one F(16)ErPb3 tetrahedra,  an edgeedge with one F(31)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the sixth F site, F(6) is bonded to one Er(1), one Pb(3), one Pb(5), and one Pb(8) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(4)Er2Pb2 tetrahedra,  an edgeedge with one F(16)ErPb3 tetrahedra,  an edgeedge with one F(29)ErPb3 tetrahedra,  an edgeedge with one F(33)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the seventh F site, F(7) is bonded to one Er(2), one Pb(1), one Pb(3), and one Pb(4) atom to form distorted FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(8)Er2Pb2 tetrahedra,  an edgeedge with one F(16)ErPb3 tetrahedra,  an edgeedge with one F(26)ErPb3 tetrahedra,  an edgeedge with one F(30)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the eighth F site, F(8) is bonded to one Er(2), one Er(5), one Pb(2), and one Pb(4) atom to form FEr2Pb2 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(28)Er2Pb2 tetrahedra,  an edgeedge with one F(10)ErPb3 tetrahedra,  an edgeedge with one F(3)ErPb3 tetrahedra, and  an edgeedge with one F(7)ErPb3 tetrahedra. In the ninth F site, F(9) is bonded in a bent 150 degrees geometry to one Er(1) and one Er(2) atom. In the tenth F site, F(10) is bonded to one Er(5), one Pb(2), one Pb(3), and one Pb(6) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(13)Er2Pb2 tetrahedra,  an edgeedge with one F(8)Er2Pb2 tetrahedra,  an edgeedge with one F(26)ErPb3 tetrahedra,  an edgeedge with one F(29)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the eleventh F site, F(11) is bonded in a bent 150 degrees geometry to one Er(1) and one Er(3) atom. In the twelfth F site, F(12) is bonded in a bent 150 degrees geometry to one Er(1) and one Er(4) atom. In the thirteenth F site, F(13) is bonded to one Er(3), one Er(4), one Pb(2), and one Pb(6) atom to form FEr2Pb2 tetrahedra that share  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(23)Er2Pb2 tetrahedra,  an edgeedge with one F(10)ErPb3 tetrahedra,  an edgeedge with one F(20)ErPb3 tetrahedra, and  an edgeedge with one F(5)ErPb3 tetrahedra. In the fourteenth F site, F(14) is bonded in a bent 150 degrees geometry to one Er(1) and one Er(5) atom. In the fifteenth F site, F(15) is bonded in a bent 150 degrees geometry to one Er(2) and one Er(3) atom. In the sixteenth F site, F(16) is bonded to one Er(4), one Pb(3), one Pb(4), and one Pb(8) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(23)Er2Pb2 tetrahedra,  an edgeedge with one F(5)ErPb3 tetrahedra,  an edgeedge with one F(6)ErPb3 tetrahedra,  an edgeedge with one F(7)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the seventeenth F site, F(17) is bonded in a bent 150 degrees geometry to one Er(2) and one Er(4) atom. In the eighteenth F site, F(18) is bonded in a bent 120 degrees geometry to one Er(3) and one Er(5) atom. In the nineteenth F site, F(19) is bonded in a trigonal non-coplanar geometry to one Er(3), one Er(5), and one Er(6) atom. In the twentieth F site, F(20) is bonded to one Er(3), one Pb(1), one Pb(5), and one Pb(6) atom to form distorted FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(13)Er2Pb2 tetrahedra,  an edgeedge with one F(29)ErPb3 tetrahedra,  an edgeedge with one F(30)ErPb3 tetrahedra,  an edgeedge with one F(31)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the twenty-first F site, F(21) is bonded in a bent 150 degrees geometry to one Er(4) and one Er(5) atom. In the twenty-second F site, F(22) is bonded in a bent 150 degrees geometry to one Er(2) and one Er(6) atom. In the twenty-third F site, F(23) is bonded to one Er(3), one Er(4), one Pb(3), and one Pb(7) atom to form FEr2Pb2 tetrahedra that share  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(13)Er2Pb2 tetrahedra,  an edgeedge with one F(16)ErPb3 tetrahedra,  an edgeedge with one F(26)ErPb3 tetrahedra, and  an edgeedge with one F(31)ErPb3 tetrahedra. In the twenty-fourth F site, F(24) is bonded in a bent 120 degrees geometry to one Er(3) and one Er(6) atom. In the twenty-fifth F site, F(25) is bonded in a bent 150 degrees geometry to one Er(4) and one Er(6) atom. In the twenty-sixth F site, F(26) is bonded to one Er(2), one Pb(3), one Pb(6), and one Pb(7) atom to form distorted FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(23)Er2Pb2 tetrahedra,  an edgeedge with one F(28)Er2Pb2 tetrahedra,  an edgeedge with one F(10)ErPb3 tetrahedra,  an edgeedge with one F(7)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the twenty-seventh F site, F(27) is bonded in a bent 120 degrees geometry to one Er(5) and one Er(6) atom. In the twenty-eighth F site, F(28) is bonded to one Er(2), one Er(5), one Pb(5), and one Pb(7) atom to form FEr2Pb2 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(8)Er2Pb2 tetrahedra,  an edgeedge with one F(26)ErPb3 tetrahedra,  an edgeedge with one F(29)ErPb3 tetrahedra, and  an edgeedge with one F(33)ErPb3 tetrahedra. In the twenty-ninth F site, F(29) is bonded to one Er(5), one Pb(5), one Pb(6), and one Pb(8) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(28)Er2Pb2 tetrahedra,  an edgeedge with one F(10)ErPb3 tetrahedra,  an edgeedge with one F(20)ErPb3 tetrahedra,  an edgeedge with one F(6)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the thirtieth F site, F(30) is bonded to one Er(6), one Pb(1), one Pb(4), and one Pb(6) atom to form distorted FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(32)Er2Pb2 tetrahedra,  an edgeedge with one F(20)ErPb3 tetrahedra,  an edgeedge with one F(3)ErPb3 tetrahedra,  an edgeedge with one F(7)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the thirty-first F site, F(31) is bonded to one Er(3), one Pb(1), one Pb(7), and one Pb(8) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(23)Er2Pb2 tetrahedra,  an edgeedge with one F(32)Er2Pb2 tetrahedra,  an edgeedge with one F(20)ErPb3 tetrahedra,  an edgeedge with one F(5)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the thirty-second F site, F(32) is bonded to one Er(1), one Er(6), one Pb(1), and one Pb(7) atom to form distorted FEr2Pb2 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(4)Er2Pb2 tetrahedra,  an edgeedge with one F(30)ErPb3 tetrahedra,  an edgeedge with one F(31)ErPb3 tetrahedra, and  an edgeedge with one F(33)ErPb3 tetrahedra. In the thirty-third F site, F(33) is bonded to one Er(1), one Pb(4), one Pb(5), and one Pb(7) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(28)Er2Pb2 tetrahedra,  an edgeedge with one F(32)Er2Pb2 tetrahedra,  an edgeedge with one F(3)ErPb3 tetrahedra,  an edgeedge with one F(6)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the thirty-fourth F site, F(34) is bonded to one Pb(4), one Pb(6), one Pb(7), and one Pb(8) atom to form FPb4 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  an edgeedge with one F(16)ErPb3 tetrahedra,  an edgeedge with one F(26)ErPb3 tetrahedra,  an edgeedge with one F(29)ErPb3 tetrahedra,  an edgeedge with one F(30)ErPb3 tetrahedra,  an edgeedge with one F(31)ErPb3 tetrahedra, and  an edgeedge with one F(33)ErPb3 tetrahedra.
Er3Pb4F17 crystallizes in the triclinic P1 space group. There are six inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to one F(11), one F(12), one F(14), one F(32), one F(33), one F(4), one F(6), and one F(9) atom. The Er(1)-F(11) bond length is 2.22 Å. The Er(1)-F(12) bond length is 2.19 Å. The Er(1)-F(14) bond length is 2.22 Å. The Er(1)-F(32) bond length is 2.28 Å. The Er(1)-F(33) bond length is 2.27 Å. The Er(1)-F(4) bond length is 2.28 Å. The Er(1)-F(6) bond length is 2.28 Å. The Er(1)-F(9) bond length is 2.23 Å. In the second Er site, Er(2) is bonded in a 8-coordinate geometry to one F(15), one F(17), one F(22), one F(26), one F(28), one F(7), one F(8), and one F(9) atom. The Er(2)-F(15) bond length is 2.23 Å. The Er(2)-F(17) bond length is 2.21 Å. The Er(2)-F(22) bond length is 2.20 Å. The Er(2)-F(26) bond length is 2.26 Å. The Er(2)-F(28) bond length is 2.27 Å. The Er(2)-F(7) bond length is 2.25 Å. The Er(2)-F(8) bond length is 2.30 Å. The Er(2)-F(9) bond length is 2.21 Å. In the third Er site, Er(3) is bonded in a 9-coordinate geometry to one F(11), one F(13), one F(15), one F(18), one F(19), one F(20), one F(23), one F(24), and one F(31) atom. The Er(3)-F(11) bond length is 2.23 Å. The Er(3)-F(13) bond length is 2.42 Å. The Er(3)-F(15) bond length is 2.20 Å. The Er(3)-F(18) bond length is 2.22 Å. The Er(3)-F(19) bond length is 2.39 Å. The Er(3)-F(20) bond length is 2.30 Å. The Er(3)-F(23) bond length is 2.35 Å. The Er(3)-F(24) bond length is 2.24 Å. The Er(3)-F(31) bond length is 2.34 Å. In the fourth Er site, Er(4) is bonded in a 8-coordinate geometry to one F(12), one F(13), one F(16), one F(17), one F(21), one F(23), one F(25), and one F(5) atom. The Er(4)-F(12) bond length is 2.22 Å. The Er(4)-F(13) bond length is 2.27 Å. The Er(4)-F(16) bond length is 2.27 Å. The Er(4)-F(17) bond length is 2.19 Å. The Er(4)-F(21) bond length is 2.21 Å. The Er(4)-F(23) bond length is 2.29 Å. The Er(4)-F(25) bond length is 2.24 Å. The Er(4)-F(5) bond length is 2.27 Å. In the fifth Er site, Er(5) is bonded in a 9-coordinate geometry to one F(10), one F(14), one F(18), one F(19), one F(21), one F(27), one F(28), one F(29), and one F(8) atom. The Er(5)-F(10) bond length is 2.34 Å. The Er(5)-F(14) bond length is 2.20 Å. The Er(5)-F(18) bond length is 2.24 Å. The Er(5)-F(19) bond length is 2.47 Å. The Er(5)-F(21) bond length is 2.22 Å. The Er(5)-F(27) bond length is 2.22 Å. The Er(5)-F(28) bond length is 2.36 Å. The Er(5)-F(29) bond length is 2.32 Å. The Er(5)-F(8) bond length is 2.37 Å. In the sixth Er site, Er(6) is bonded in a 9-coordinate geometry to one F(19), one F(22), one F(24), one F(25), one F(27), one F(3), one F(30), one F(32), and one F(4) atom. The Er(6)-F(19) bond length is 2.63 Å. The Er(6)-F(22) bond length is 2.21 Å. The Er(6)-F(24) bond length is 2.20 Å. The Er(6)-F(25) bond length is 2.20 Å. The Er(6)-F(27) bond length is 2.24 Å. The Er(6)-F(3) bond length is 2.32 Å. The Er(6)-F(30) bond length is 2.28 Å. The Er(6)-F(32) bond length is 2.37 Å. The Er(6)-F(4) bond length is 2.34 Å. There are eight inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 8-coordinate geometry to one F(1), one F(2), one F(20), one F(30), one F(31), one F(32), one F(5), and one F(7) atom. The Pb(1)-F(1) bond length is 2.60 Å. The Pb(1)-F(2) bond length is 2.50 Å. The Pb(1)-F(20) bond length is 2.50 Å. The Pb(1)-F(30) bond length is 2.50 Å. The Pb(1)-F(31) bond length is 2.60 Å. The Pb(1)-F(32) bond length is 2.66 Å. The Pb(1)-F(5) bond length is 2.69 Å. The Pb(1)-F(7) bond length is 2.56 Å. In the second Pb site, Pb(2) is bonded in a 7-coordinate geometry to one F(10), one F(13), one F(2), one F(3), one F(4), one F(5), and one F(8) atom. The Pb(2)-F(10) bond length is 2.49 Å. The Pb(2)-F(13) bond length is 2.56 Å. The Pb(2)-F(2) bond length is 2.49 Å. The Pb(2)-F(3) bond length is 2.52 Å. The Pb(2)-F(4) bond length is 2.54 Å. The Pb(2)-F(5) bond length is 2.55 Å. The Pb(2)-F(8) bond length is 2.55 Å. In the third Pb site, Pb(3) is bonded in a 7-coordinate geometry to one F(10), one F(16), one F(2), one F(23), one F(26), one F(6), and one F(7) atom. The Pb(3)-F(10) bond length is 2.58 Å. The Pb(3)-F(16) bond length is 2.54 Å. The Pb(3)-F(2) bond length is 2.50 Å. The Pb(3)-F(23) bond length is 2.59 Å. The Pb(3)-F(26) bond length is 2.62 Å. The Pb(3)-F(6) bond length is 2.58 Å. The Pb(3)-F(7) bond length is 2.61 Å. In the fourth Pb site, Pb(4) is bonded in a 8-coordinate geometry to one F(1), one F(16), one F(3), one F(30), one F(33), one F(34), one F(7), and one F(8) atom. The Pb(4)-F(1) bond length is 2.68 Å. The Pb(4)-F(16) bond length is 2.57 Å. The Pb(4)-F(3) bond length is 2.61 Å. The Pb(4)-F(30) bond length is 2.54 Å. The Pb(4)-F(33) bond length is 2.65 Å. The Pb(4)-F(34) bond length is 2.49 Å. The Pb(4)-F(7) bond length is 2.49 Å. The Pb(4)-F(8) bond length is 2.65 Å. In the fifth Pb site, Pb(5) is bonded in a 7-coordinate geometry to one F(2), one F(20), one F(28), one F(29), one F(3), one F(33), and one F(6) atom. The Pb(5)-F(2) bond length is 2.54 Å. The Pb(5)-F(20) bond length is 2.59 Å. The Pb(5)-F(28) bond length is 2.59 Å. The Pb(5)-F(29) bond length is 2.49 Å. The Pb(5)-F(3) bond length is 2.64 Å. The Pb(5)-F(33) bond length is 2.58 Å. The Pb(5)-F(6) bond length is 2.53 Å. In the sixth Pb site, Pb(6) is bonded in a 8-coordinate geometry to one F(1), one F(10), one F(13), one F(20), one F(26), one F(29), one F(30), and one F(34) atom. The Pb(6)-F(1) bond length is 2.68 Å. The Pb(6)-F(10) bond length is 2.61 Å. The Pb(6)-F(13) bond length is 2.63 Å. The Pb(6)-F(20) bond length is 2.47 Å. The Pb(6)-F(26) bond length is 2.68 Å. The Pb(6)-F(29) bond length is 2.47 Å. The Pb(6)-F(30) bond length is 2.58 Å. The Pb(6)-F(34) bond length is 2.53 Å. In the seventh Pb site, Pb(7) is bonded in a 7-coordinate geometry to one F(23), one F(26), one F(28), one F(31), one F(32), one F(33), and one F(34) atom. The Pb(7)-F(23) bond length is 2.54 Å. The Pb(7)-F(26) bond length is 2.52 Å. The Pb(7)-F(28) bond length is 2.57 Å. The Pb(7)-F(31) bond length is 2.47 Å. The Pb(7)-F(32) bond length is 2.55 Å. The Pb(7)-F(33) bond length is 2.56 Å. The Pb(7)-F(34) bond length is 2.47 Å. In the eighth Pb site, Pb(8) is bonded in a 7-coordinate geometry to one F(16), one F(29), one F(31), one F(34), one F(4), one F(5), and one F(6) atom. The Pb(8)-F(16) bond length is 2.55 Å. The Pb(8)-F(29) bond length is 2.61 Å. The Pb(8)-F(31) bond length is 2.63 Å. The Pb(8)-F(34) bond length is 2.51 Å. The Pb(8)-F(4) bond length is 2.61 Å. The Pb(8)-F(5) bond length is 2.61 Å. The Pb(8)-F(6) bond length is 2.50 Å. There are thirty-four inequivalent F sites. In the first F site, F(1) is bonded in a 3-coordinate geometry to one Pb(1), one Pb(4), and one Pb(6) atom. In the second F site, F(2) is bonded to one Pb(1), one Pb(2), one Pb(3), and one Pb(5) atom to form FPb4 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  an edgeedge with one F(10)ErPb3 tetrahedra,  an edgeedge with one F(20)ErPb3 tetrahedra,  an edgeedge with one F(3)ErPb3 tetrahedra,  an edgeedge with one F(5)ErPb3 tetrahedra,  an edgeedge with one F(6)ErPb3 tetrahedra, and  an edgeedge with one F(7)ErPb3 tetrahedra. In the third F site, F(3) is bonded to one Er(6), one Pb(2), one Pb(4), and one Pb(5) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(4)Er2Pb2 tetrahedra,  an edgeedge with one F(8)Er2Pb2 tetrahedra,  an edgeedge with one F(30)ErPb3 tetrahedra,  an edgeedge with one F(33)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the fourth F site, F(4) is bonded to one Er(1), one Er(6), one Pb(2), and one Pb(8) atom to form FEr2Pb2 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(32)Er2Pb2 tetrahedra,  an edgeedge with one F(3)ErPb3 tetrahedra,  an edgeedge with one F(5)ErPb3 tetrahedra, and  an edgeedge with one F(6)ErPb3 tetrahedra. In the fifth F site, F(5) is bonded to one Er(4), one Pb(1), one Pb(2), and one Pb(8) atom to form distorted FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(13)Er2Pb2 tetrahedra,  an edgeedge with one F(4)Er2Pb2 tetrahedra,  an edgeedge with one F(16)ErPb3 tetrahedra,  an edgeedge with one F(31)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the sixth F site, F(6) is bonded to one Er(1), one Pb(3), one Pb(5), and one Pb(8) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(4)Er2Pb2 tetrahedra,  an edgeedge with one F(16)ErPb3 tetrahedra,  an edgeedge with one F(29)ErPb3 tetrahedra,  an edgeedge with one F(33)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the seventh F site, F(7) is bonded to one Er(2), one Pb(1), one Pb(3), and one Pb(4) atom to form distorted FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(8)Er2Pb2 tetrahedra,  an edgeedge with one F(16)ErPb3 tetrahedra,  an edgeedge with one F(26)ErPb3 tetrahedra,  an edgeedge with one F(30)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the eighth F site, F(8) is bonded to one Er(2), one Er(5), one Pb(2), and one Pb(4) atom to form FEr2Pb2 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(28)Er2Pb2 tetrahedra,  an edgeedge with one F(10)ErPb3 tetrahedra,  an edgeedge with one F(3)ErPb3 tetrahedra, and  an edgeedge with one F(7)ErPb3 tetrahedra. In the ninth F site, F(9) is bonded in a bent 150 degrees geometry to one Er(1) and one Er(2) atom. In the tenth F site, F(10) is bonded to one Er(5), one Pb(2), one Pb(3), and one Pb(6) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(13)Er2Pb2 tetrahedra,  an edgeedge with one F(8)Er2Pb2 tetrahedra,  an edgeedge with one F(26)ErPb3 tetrahedra,  an edgeedge with one F(29)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the eleventh F site, F(11) is bonded in a bent 150 degrees geometry to one Er(1) and one Er(3) atom. In the twelfth F site, F(12) is bonded in a bent 150 degrees geometry to one Er(1) and one Er(4) atom. In the thirteenth F site, F(13) is bonded to one Er(3), one Er(4), one Pb(2), and one Pb(6) atom to form FEr2Pb2 tetrahedra that share  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(23)Er2Pb2 tetrahedra,  an edgeedge with one F(10)ErPb3 tetrahedra,  an edgeedge with one F(20)ErPb3 tetrahedra, and  an edgeedge with one F(5)ErPb3 tetrahedra. In the fourteenth F site, F(14) is bonded in a bent 150 degrees geometry to one Er(1) and one Er(5) atom. In the fifteenth F site, F(15) is bonded in a bent 150 degrees geometry to one Er(2) and one Er(3) atom. In the sixteenth F site, F(16) is bonded to one Er(4), one Pb(3), one Pb(4), and one Pb(8) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(23)Er2Pb2 tetrahedra,  an edgeedge with one F(5)ErPb3 tetrahedra,  an edgeedge with one F(6)ErPb3 tetrahedra,  an edgeedge with one F(7)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the seventeenth F site, F(17) is bonded in a bent 150 degrees geometry to one Er(2) and one Er(4) atom. In the eighteenth F site, F(18) is bonded in a bent 120 degrees geometry to one Er(3) and one Er(5) atom. In the nineteenth F site, F(19) is bonded in a trigonal non-coplanar geometry to one Er(3), one Er(5), and one Er(6) atom. In the twentieth F site, F(20) is bonded to one Er(3), one Pb(1), one Pb(5), and one Pb(6) atom to form distorted FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(13)Er2Pb2 tetrahedra,  an edgeedge with one F(29)ErPb3 tetrahedra,  an edgeedge with one F(30)ErPb3 tetrahedra,  an edgeedge with one F(31)ErPb3 tetrahedra, and  an edgeedge with one F(2)Pb4 tetrahedra. In the twenty-first F site, F(21) is bonded in a bent 150 degrees geometry to one Er(4) and one Er(5) atom. In the twenty-second F site, F(22) is bonded in a bent 150 degrees geometry to one Er(2) and one Er(6) atom. In the twenty-third F site, F(23) is bonded to one Er(3), one Er(4), one Pb(3), and one Pb(7) atom to form FEr2Pb2 tetrahedra that share  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(13)Er2Pb2 tetrahedra,  an edgeedge with one F(16)ErPb3 tetrahedra,  an edgeedge with one F(26)ErPb3 tetrahedra, and  an edgeedge with one F(31)ErPb3 tetrahedra. In the twenty-fourth F site, F(24) is bonded in a bent 120 degrees geometry to one Er(3) and one Er(6) atom. In the twenty-fifth F site, F(25) is bonded in a bent 150 degrees geometry to one Er(4) and one Er(6) atom. In the twenty-sixth F site, F(26) is bonded to one Er(2), one Pb(3), one Pb(6), and one Pb(7) atom to form distorted FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(23)Er2Pb2 tetrahedra,  an edgeedge with one F(28)Er2Pb2 tetrahedra,  an edgeedge with one F(10)ErPb3 tetrahedra,  an edgeedge with one F(7)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the twenty-seventh F site, F(27) is bonded in a bent 120 degrees geometry to one Er(5) and one Er(6) atom. In the twenty-eighth F site, F(28) is bonded to one Er(2), one Er(5), one Pb(5), and one Pb(7) atom to form FEr2Pb2 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(8)Er2Pb2 tetrahedra,  an edgeedge with one F(26)ErPb3 tetrahedra,  an edgeedge with one F(29)ErPb3 tetrahedra, and  an edgeedge with one F(33)ErPb3 tetrahedra. In the twenty-ninth F site, F(29) is bonded to one Er(5), one Pb(5), one Pb(6), and one Pb(8) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(28)Er2Pb2 tetrahedra,  an edgeedge with one F(10)ErPb3 tetrahedra,  an edgeedge with one F(20)ErPb3 tetrahedra,  an edgeedge with one F(6)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the thirtieth F site, F(30) is bonded to one Er(6), one Pb(1), one Pb(4), and one Pb(6) atom to form distorted FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(32)Er2Pb2 tetrahedra,  an edgeedge with one F(20)ErPb3 tetrahedra,  an edgeedge with one F(3)ErPb3 tetrahedra,  an edgeedge with one F(7)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the thirty-first F site, F(31) is bonded to one Er(3), one Pb(1), one Pb(7), and one Pb(8) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(33)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(23)Er2Pb2 tetrahedra,  an edgeedge with one F(32)Er2Pb2 tetrahedra,  an edgeedge with one F(20)ErPb3 tetrahedra,  an edgeedge with one F(5)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the thirty-second F site, F(32) is bonded to one Er(1), one Er(6), one Pb(1), and one Pb(7) atom to form distorted FEr2Pb2 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  a cornercorner with one F(34)Pb4 tetrahedra,  an edgeedge with one F(4)Er2Pb2 tetrahedra,  an edgeedge with one F(30)ErPb3 tetrahedra,  an edgeedge with one F(31)ErPb3 tetrahedra, and  an edgeedge with one F(33)ErPb3 tetrahedra. In the thirty-third F site, F(33) is bonded to one Er(1), one Pb(4), one Pb(5), and one Pb(7) atom to form FErPb3 tetrahedra that share  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(16)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(26)ErPb3 tetrahedra,  a cornercorner with one F(29)ErPb3 tetrahedra,  a cornercorner with one F(30)ErPb3 tetrahedra,  a cornercorner with one F(31)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  a cornercorner with one F(2)Pb4 tetrahedra,  an edgeedge with one F(28)Er2Pb2 tetrahedra,  an edgeedge with one F(32)Er2Pb2 tetrahedra,  an edgeedge with one F(3)ErPb3 tetrahedra,  an edgeedge with one F(6)ErPb3 tetrahedra, and  an edgeedge with one F(34)Pb4 tetrahedra. In the thirty-fourth F site, F(34) is bonded to one Pb(4), one Pb(6), one Pb(7), and one Pb(8) atom to form FPb4 tetrahedra that share  a cornercorner with one F(13)Er2Pb2 tetrahedra,  a cornercorner with one F(23)Er2Pb2 tetrahedra,  a cornercorner with one F(28)Er2Pb2 tetrahedra,  a cornercorner with one F(32)Er2Pb2 tetrahedra,  a cornercorner with one F(4)Er2Pb2 tetrahedra,  a cornercorner with one F(8)Er2Pb2 tetrahedra,  a cornercorner with one F(10)ErPb3 tetrahedra,  a cornercorner with one F(20)ErPb3 tetrahedra,  a cornercorner with one F(3)ErPb3 tetrahedra,  a cornercorner with one F(5)ErPb3 tetrahedra,  a cornercorner with one F(6)ErPb3 tetrahedra,  a cornercorner with one F(7)ErPb3 tetrahedra,  an edgeedge with one F(16)ErPb3 tetrahedra,  an edgeedge with one F(26)ErPb3 tetrahedra,  an edgeedge with one F(29)ErPb3 tetrahedra,  an edgeedge with one F(30)ErPb3 tetrahedra,  an edgeedge with one F(31)ErPb3 tetrahedra, and  an edgeedge with one F(33)ErPb3 tetrahedra.