MgTm6WO12 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(12), one O(2), one O(3), and one O(9) atom. There are six inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(6), and one O(9) atom. In the second Tm site, Tm(2) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. In the third Tm site, Tm(3) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(12), one O(3), one O(5), one O(6), and one O(9) atom. In the fourth Tm site, Tm(4) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(7), and one O(8) atom. In the fifth Tm site, Tm(5) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the sixth Tm site, Tm(6) is bonded to one O(10), one O(11), one O(12), one O(2), one O(4), one O(7), and one O(9) atom to form distorted TmO7 pentagonal bipyramids that share  a cornercorner with one W(1)O6 octahedra and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles are 46°. W(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one Tm(6)O7 pentagonal bipyramid and  an edgeedge with one Tm(6)O7 pentagonal bipyramid. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Mg(1), one Tm(1), one Tm(3), one Tm(4), and one W(1) atom. In the second O site, O(2) is bonded to one Mg(1), one Tm(1), one Tm(2), one Tm(6), and one W(1) atom to form distorted OTm3MgW trigonal bipyramids that share  a cornercorner with one O(11)Tm3W tetrahedra,  a cornercorner with one O(10)Tm4 tetrahedra,  a cornercorner with one O(4)Tm4 tetrahedra, corners with two equivalent O(7)Tm4 tetrahedra,  a cornercorner with one O(9)Tm4Mg trigonal bipyramid,  an edgeedge with one O(11)Tm3W tetrahedra,  an edgeedge with one O(4)Tm4 tetrahedra,  an edgeedge with one O(6)Tm4 tetrahedra, and  an edgeedge with one O(9)Tm4Mg trigonal bipyramid. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Mg(1), one Tm(1), one Tm(2), one Tm(3), and one Tm(4) atom. In the fourth O site, O(4) is bonded to one Tm(1), one Tm(2), one Tm(4), and one Tm(6) atom to form distorted OTm4 tetrahedra that share  a cornercorner with one O(7)Tm4 tetrahedra, corners with two equivalent O(11)Tm3W tetrahedra, corners with two equivalent O(10)Tm4 tetrahedra, corners with two equivalent O(6)Tm4 tetrahedra,  a cornercorner with one O(2)Tm3MgW trigonal bipyramid,  an edgeedge with one O(7)Tm4 tetrahedra,  an edgeedge with one O(2)Tm3MgW trigonal bipyramid, and  an edgeedge with one O(9)Tm4Mg trigonal bipyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Tm(2), one Tm(3), one Tm(5), and one W(1) atom. In the sixth O site, O(6) is bonded to one Tm(1), one Tm(2), one Tm(3), and one Tm(5) atom to form OTm4 tetrahedra that share corners with two equivalent O(11)Tm3W tetrahedra, corners with two equivalent O(10)Tm4 tetrahedra, corners with two equivalent O(4)Tm4 tetrahedra,  a cornercorner with one O(9)Tm4Mg trigonal bipyramid,  an edgeedge with one O(7)Tm4 tetrahedra,  an edgeedge with one O(2)Tm3MgW trigonal bipyramid, and  an edgeedge with one O(9)Tm4Mg trigonal bipyramid. In the seventh O site, O(7) is bonded to one Tm(2), one Tm(4), one Tm(5), and one Tm(6) atom to form OTm4 tetrahedra that share  a cornercorner with one O(10)Tm4 tetrahedra,  a cornercorner with one O(4)Tm4 tetrahedra, corners with two equivalent O(2)Tm3MgW trigonal bipyramids, corners with two equivalent O(9)Tm4Mg trigonal bipyramids,  an edgeedge with one O(11)Tm3W tetrahedra,  an edgeedge with one O(10)Tm4 tetrahedra,  an edgeedge with one O(4)Tm4 tetrahedra, and  an edgeedge with one O(6)Tm4 tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Tm(4), one Tm(5), and one W(1) atom. In the ninth O site, O(9) is bonded to one Mg(1), one Tm(1), one Tm(3), one Tm(5), and one Tm(6) atom to form distorted OTm4Mg trigonal bipyramids that share  a cornercorner with one O(11)Tm3W tetrahedra,  a cornercorner with one O(10)Tm4 tetrahedra,  a cornercorner with one O(6)Tm4 tetrahedra, corners with two equivalent O(7)Tm4 tetrahedra,  a cornercorner with one O(2)Tm3MgW trigonal bipyramid,  an edgeedge with one O(11)Tm3W tetrahedra,  an edgeedge with one O(10)Tm4 tetrahedra,  an edgeedge with one O(4)Tm4 tetrahedra,  an edgeedge with one O(6)Tm4 tetrahedra, and  an edgeedge with one O(2)Tm3MgW trigonal bipyramid. In the tenth O site, O(10) is bonded to one Tm(3), one Tm(4), one Tm(5), and one Tm(6) atom to form OTm4 tetrahedra that share  a cornercorner with one O(7)Tm4 tetrahedra, corners with two equivalent O(11)Tm3W tetrahedra, corners with two equivalent O(4)Tm4 tetrahedra, corners with two equivalent O(6)Tm4 tetrahedra,  a cornercorner with one O(2)Tm3MgW trigonal bipyramid,  a cornercorner with one O(9)Tm4Mg trigonal bipyramid,  an edgeedge with one O(7)Tm4 tetrahedra, and  an edgeedge with one O(9)Tm4Mg trigonal bipyramid. In the eleventh O site, O(11) is bonded to one Tm(1), one Tm(5), one Tm(6), and one W(1) atom to form OTm3W tetrahedra that share corners with two equivalent O(10)Tm4 tetrahedra, corners with two equivalent O(4)Tm4 tetrahedra, corners with two equivalent O(6)Tm4 tetrahedra,  a cornercorner with one O(2)Tm3MgW trigonal bipyramid,  a cornercorner with one O(9)Tm4Mg trigonal bipyramid,  an edgeedge with one O(7)Tm4 tetrahedra,  an edgeedge with one O(2)Tm3MgW trigonal bipyramid, and  an edgeedge with one O(9)Tm4Mg trigonal bipyramid. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Mg(1), one Tm(3), one Tm(6), and one W(1) atom.
MgTm6WO12 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(12), one O(2), one O(3), and one O(9) atom. The Mg(1)-O(1) bond length is 2.26 Å. The Mg(1)-O(12) bond length is 1.98 Å. The Mg(1)-O(2) bond length is 2.02 Å. The Mg(1)-O(3) bond length is 2.14 Å. The Mg(1)-O(9) bond length is 1.99 Å. There are six inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(6), and one O(9) atom. The Tm(1)-O(1) bond length is 2.41 Å. The Tm(1)-O(11) bond length is 2.16 Å. The Tm(1)-O(2) bond length is 2.38 Å. The Tm(1)-O(3) bond length is 2.50 Å. The Tm(1)-O(4) bond length is 2.40 Å. The Tm(1)-O(6) bond length is 2.15 Å. The Tm(1)-O(9) bond length is 2.34 Å. In the second Tm site, Tm(2) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The Tm(2)-O(2) bond length is 2.38 Å. The Tm(2)-O(3) bond length is 2.20 Å. The Tm(2)-O(4) bond length is 2.43 Å. The Tm(2)-O(5) bond length is 2.22 Å. The Tm(2)-O(6) bond length is 2.24 Å. The Tm(2)-O(7) bond length is 2.15 Å. In the third Tm site, Tm(3) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(12), one O(3), one O(5), one O(6), and one O(9) atom. The Tm(3)-O(1) bond length is 2.84 Å. The Tm(3)-O(10) bond length is 2.23 Å. The Tm(3)-O(12) bond length is 2.30 Å. The Tm(3)-O(3) bond length is 2.34 Å. The Tm(3)-O(5) bond length is 2.24 Å. The Tm(3)-O(6) bond length is 2.23 Å. The Tm(3)-O(9) bond length is 2.29 Å. In the fourth Tm site, Tm(4) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(7), and one O(8) atom. The Tm(4)-O(1) bond length is 2.39 Å. The Tm(4)-O(10) bond length is 2.16 Å. The Tm(4)-O(3) bond length is 2.31 Å. The Tm(4)-O(4) bond length is 2.14 Å. The Tm(4)-O(7) bond length is 2.22 Å. The Tm(4)-O(8) bond length is 2.32 Å. In the fifth Tm site, Tm(5) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Tm(5)-O(10) bond length is 2.16 Å. The Tm(5)-O(11) bond length is 2.26 Å. The Tm(5)-O(5) bond length is 2.70 Å. The Tm(5)-O(6) bond length is 2.26 Å. The Tm(5)-O(7) bond length is 2.27 Å. The Tm(5)-O(8) bond length is 2.28 Å. The Tm(5)-O(9) bond length is 2.54 Å. In the sixth Tm site, Tm(6) is bonded to one O(10), one O(11), one O(12), one O(2), one O(4), one O(7), and one O(9) atom to form distorted TmO7 pentagonal bipyramids that share  a cornercorner with one W(1)O6 octahedra and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles are 46°. The Tm(6)-O(10) bond length is 2.27 Å. The Tm(6)-O(11) bond length is 2.38 Å. The Tm(6)-O(12) bond length is 2.30 Å. The Tm(6)-O(2) bond length is 2.47 Å. The Tm(6)-O(4) bond length is 2.24 Å. The Tm(6)-O(7) bond length is 2.21 Å. The Tm(6)-O(9) bond length is 2.40 Å. W(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(8) atom to form WO6 octahedra that share  a cornercorner with one Tm(6)O7 pentagonal bipyramid and  an edgeedge with one Tm(6)O7 pentagonal bipyramid. The W(1)-O(1) bond length is 2.02 Å. The W(1)-O(11) bond length is 2.12 Å. The W(1)-O(12) bond length is 2.11 Å. The W(1)-O(2) bond length is 2.25 Å. The W(1)-O(5) bond length is 2.09 Å. The W(1)-O(8) bond length is 2.09 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Mg(1), one Tm(1), one Tm(3), one Tm(4), and one W(1) atom. In the second O site, O(2) is bonded to one Mg(1), one Tm(1), one Tm(2), one Tm(6), and one W(1) atom to form distorted OTm3MgW trigonal bipyramids that share  a cornercorner with one O(11)Tm3W tetrahedra,  a cornercorner with one O(10)Tm4 tetrahedra,  a cornercorner with one O(4)Tm4 tetrahedra, corners with two equivalent O(7)Tm4 tetrahedra,  a cornercorner with one O(9)Tm4Mg trigonal bipyramid,  an edgeedge with one O(11)Tm3W tetrahedra,  an edgeedge with one O(4)Tm4 tetrahedra,  an edgeedge with one O(6)Tm4 tetrahedra, and  an edgeedge with one O(9)Tm4Mg trigonal bipyramid. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Mg(1), one Tm(1), one Tm(2), one Tm(3), and one Tm(4) atom. In the fourth O site, O(4) is bonded to one Tm(1), one Tm(2), one Tm(4), and one Tm(6) atom to form distorted OTm4 tetrahedra that share  a cornercorner with one O(7)Tm4 tetrahedra, corners with two equivalent O(11)Tm3W tetrahedra, corners with two equivalent O(10)Tm4 tetrahedra, corners with two equivalent O(6)Tm4 tetrahedra,  a cornercorner with one O(2)Tm3MgW trigonal bipyramid,  an edgeedge with one O(7)Tm4 tetrahedra,  an edgeedge with one O(2)Tm3MgW trigonal bipyramid, and  an edgeedge with one O(9)Tm4Mg trigonal bipyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Tm(2), one Tm(3), one Tm(5), and one W(1) atom. In the sixth O site, O(6) is bonded to one Tm(1), one Tm(2), one Tm(3), and one Tm(5) atom to form OTm4 tetrahedra that share corners with two equivalent O(11)Tm3W tetrahedra, corners with two equivalent O(10)Tm4 tetrahedra, corners with two equivalent O(4)Tm4 tetrahedra,  a cornercorner with one O(9)Tm4Mg trigonal bipyramid,  an edgeedge with one O(7)Tm4 tetrahedra,  an edgeedge with one O(2)Tm3MgW trigonal bipyramid, and  an edgeedge with one O(9)Tm4Mg trigonal bipyramid. In the seventh O site, O(7) is bonded to one Tm(2), one Tm(4), one Tm(5), and one Tm(6) atom to form OTm4 tetrahedra that share  a cornercorner with one O(10)Tm4 tetrahedra,  a cornercorner with one O(4)Tm4 tetrahedra, corners with two equivalent O(2)Tm3MgW trigonal bipyramids, corners with two equivalent O(9)Tm4Mg trigonal bipyramids,  an edgeedge with one O(11)Tm3W tetrahedra,  an edgeedge with one O(10)Tm4 tetrahedra,  an edgeedge with one O(4)Tm4 tetrahedra, and  an edgeedge with one O(6)Tm4 tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Tm(4), one Tm(5), and one W(1) atom. In the ninth O site, O(9) is bonded to one Mg(1), one Tm(1), one Tm(3), one Tm(5), and one Tm(6) atom to form distorted OTm4Mg trigonal bipyramids that share  a cornercorner with one O(11)Tm3W tetrahedra,  a cornercorner with one O(10)Tm4 tetrahedra,  a cornercorner with one O(6)Tm4 tetrahedra, corners with two equivalent O(7)Tm4 tetrahedra,  a cornercorner with one O(2)Tm3MgW trigonal bipyramid,  an edgeedge with one O(11)Tm3W tetrahedra,  an edgeedge with one O(10)Tm4 tetrahedra,  an edgeedge with one O(4)Tm4 tetrahedra,  an edgeedge with one O(6)Tm4 tetrahedra, and  an edgeedge with one O(2)Tm3MgW trigonal bipyramid. In the tenth O site, O(10) is bonded to one Tm(3), one Tm(4), one Tm(5), and one Tm(6) atom to form OTm4 tetrahedra that share  a cornercorner with one O(7)Tm4 tetrahedra, corners with two equivalent O(11)Tm3W tetrahedra, corners with two equivalent O(4)Tm4 tetrahedra, corners with two equivalent O(6)Tm4 tetrahedra,  a cornercorner with one O(2)Tm3MgW trigonal bipyramid,  a cornercorner with one O(9)Tm4Mg trigonal bipyramid,  an edgeedge with one O(7)Tm4 tetrahedra, and  an edgeedge with one O(9)Tm4Mg trigonal bipyramid. In the eleventh O site, O(11) is bonded to one Tm(1), one Tm(5), one Tm(6), and one W(1) atom to form OTm3W tetrahedra that share corners with two equivalent O(10)Tm4 tetrahedra, corners with two equivalent O(4)Tm4 tetrahedra, corners with two equivalent O(6)Tm4 tetrahedra,  a cornercorner with one O(2)Tm3MgW trigonal bipyramid,  a cornercorner with one O(9)Tm4Mg trigonal bipyramid,  an edgeedge with one O(7)Tm4 tetrahedra,  an edgeedge with one O(2)Tm3MgW trigonal bipyramid, and  an edgeedge with one O(9)Tm4Mg trigonal bipyramid. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Mg(1), one Tm(3), one Tm(6), and one W(1) atom.