Sr10Mg2Fe3(MoO6)5 crystallizes in the triclinic P-1 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(10), one O(12), one O(13), one O(3), one O(4), one O(6), one O(7), one O(9), two equivalent O(1), and two equivalent O(11) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(4)O12 cuboctahedra,  a faceface with one Mo(1)O6 octahedra,  a faceface with one Mo(2)O6 octahedra,  a faceface with one Fe(1)O6 octahedra,  a faceface with one Fe(2)O6 octahedra, faces with two equivalent Mg(1)O6 octahedra, and faces with two equivalent Mo(3)O6 octahedra. In the second Sr site, Sr(2) is bonded to one O(13), one O(15), one O(2), one O(3), one O(4), one O(5), one O(7), one O(9), two equivalent O(12), and two equivalent O(8) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra,  a faceface with one Mg(1)O6 octahedra,  a faceface with one Mo(2)O6 octahedra,  a faceface with one Mo(3)O6 octahedra,  a faceface with one Fe(2)O6 octahedra, faces with two equivalent Mo(1)O6 octahedra, and faces with two equivalent Fe(1)O6 octahedra. In the third Sr site, Sr(3) is bonded to one O(11), one O(13), one O(2), one O(3), one O(4), one O(5), one O(7), one O(9), two equivalent O(14), and two equivalent O(8) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra,  a faceface with one Mg(1)O6 octahedra,  a faceface with one Mo(2)O6 octahedra,  a faceface with one Mo(3)O6 octahedra,  a faceface with one Fe(2)O6 octahedra, faces with two equivalent Mo(1)O6 octahedra, and faces with two equivalent Fe(1)O6 octahedra. In the fourth Sr site, Sr(4) is bonded to one O(10), one O(13), one O(14), one O(3), one O(4), one O(6), one O(7), one O(9), two equivalent O(1), and two equivalent O(15) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra,  a faceface with one Mo(1)O6 octahedra,  a faceface with one Mo(2)O6 octahedra,  a faceface with one Fe(1)O6 octahedra,  a faceface with one Fe(2)O6 octahedra, faces with two equivalent Mg(1)O6 octahedra, and faces with two equivalent Mo(3)O6 octahedra. In the fifth Sr site, Sr(5) is bonded to one O(11), one O(12), one O(14), one O(15), two equivalent O(10), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, faces with two equivalent Sr(5)O12 cuboctahedra, faces with two equivalent Mg(1)O6 octahedra, faces with two equivalent Mo(1)O6 octahedra, faces with two equivalent Mo(3)O6 octahedra, and faces with two equivalent Fe(1)O6 octahedra. Mg(1) is bonded to one O(1), one O(10), one O(11), one O(15), one O(2), and one O(9) atom to form MgO6 octahedra that share  a cornercorner with one Mo(2)O6 octahedra, corners with two equivalent Mo(1)O6 octahedra, corners with three equivalent Mo(3)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(4)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-19°. There are three inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(10), one O(12), one O(14), one O(2), one O(4), and one O(8) atom to form MoO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-18°. In the second Mo site, Mo(2) is bonded to two equivalent O(13), two equivalent O(3), and two equivalent O(9) atoms to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-18°. In the third Mo site, Mo(3) is bonded to one O(1), one O(11), one O(15), one O(5), one O(6), and one O(7) atom to form MoO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with three equivalent Mg(1)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(4)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-19°. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(12), one O(14), one O(3), one O(5), one O(6), and one O(8) atom to form FeO6 octahedra that share  a cornercorner with one Mo(2)O6 octahedra, corners with two equivalent Mo(3)O6 octahedra, corners with three equivalent Mo(1)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-19°. In the second Fe site, Fe(2) is bonded to two equivalent O(13), two equivalent O(4), and two equivalent O(7) atoms to form FeO6 octahedra that share corners with two equivalent Mo(1)O6 octahedra, corners with two equivalent Mo(2)O6 octahedra, corners with two equivalent Mo(3)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-18°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(4), one Mg(1), and one Mo(3) atom to form distorted OSr4MgMo octahedra that share  a cornercorner with one O(5)Sr4FeMo octahedra,  a cornercorner with one O(2)Sr4MgMo octahedra, corners with two equivalent O(3)Sr4FeMo octahedra, corners with two equivalent O(4)Sr4FeMo octahedra,  an edgeedge with one O(3)Sr4FeMo octahedra,  an edgeedge with one O(4)Sr4FeMo octahedra, and edges with two equivalent O(1)Sr4MgMo octahedra. The corner-sharing octahedral tilt angles range from 2-4°. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), two equivalent Sr(5), one Mg(1), and one Mo(1) atom to form distorted OSr4MgMo octahedra that share  a cornercorner with one O(1)Sr4MgMo octahedra, corners with two equivalent O(5)Sr4FeMo octahedra, corners with three equivalent O(4)Sr4FeMo octahedra,  an edgeedge with one O(3)Sr4FeMo octahedra,  an edgeedge with one O(2)Sr4MgMo octahedra, and edges with two equivalent O(5)Sr4FeMo octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mo(2), and one Fe(1) atom to form distorted OSr4FeMo octahedra that share  a cornercorner with one O(3)Sr4FeMo octahedra, corners with two equivalent O(1)Sr4MgMo octahedra, corners with three equivalent O(5)Sr4FeMo octahedra,  an edgeedge with one O(1)Sr4MgMo octahedra,  an edgeedge with one O(2)Sr4MgMo octahedra, and edges with two equivalent O(4)Sr4FeMo octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mo(1), and one Fe(2) atom to form distorted OSr4FeMo octahedra that share  a cornercorner with one O(4)Sr4FeMo octahedra, corners with two equivalent O(1)Sr4MgMo octahedra, corners with three equivalent O(2)Sr4MgMo octahedra,  an edgeedge with one O(5)Sr4FeMo octahedra,  an edgeedge with one O(1)Sr4MgMo octahedra, and edges with two equivalent O(3)Sr4FeMo octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fifth O site, O(5) is bonded to one Sr(2), one Sr(3), two equivalent Sr(5), one Mo(3), and one Fe(1) atom to form distorted OSr4FeMo octahedra that share  a cornercorner with one O(1)Sr4MgMo octahedra, corners with two equivalent O(2)Sr4MgMo octahedra, corners with three equivalent O(3)Sr4FeMo octahedra,  an edgeedge with one O(4)Sr4FeMo octahedra,  an edgeedge with one O(5)Sr4FeMo octahedra, and edges with two equivalent O(2)Sr4MgMo octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(4), two equivalent Sr(5), one Mo(3), and one Fe(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mo(3), and one Fe(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Sr(2), two equivalent Sr(3), one Mo(1), and one Fe(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mg(1), and one Mo(2) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(4), two equivalent Sr(5), one Mg(1), and one Mo(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(5), two equivalent Sr(1), one Mg(1), and one Mo(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(5), two equivalent Sr(2), one Mo(1), and one Fe(1) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mo(2), and one Fe(2) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(5), two equivalent Sr(3), one Mo(1), and one Fe(1) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(5), two equivalent Sr(4), one Mg(1), and one Mo(3) atom.
Sr10Mg2Fe3(MoO6)5 crystallizes in the triclinic P-1 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(10), one O(12), one O(13), one O(3), one O(4), one O(6), one O(7), one O(9), two equivalent O(1), and two equivalent O(11) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(4)O12 cuboctahedra,  a faceface with one Mo(1)O6 octahedra,  a faceface with one Mo(2)O6 octahedra,  a faceface with one Fe(1)O6 octahedra,  a faceface with one Fe(2)O6 octahedra, faces with two equivalent Mg(1)O6 octahedra, and faces with two equivalent Mo(3)O6 octahedra. The Sr(1)-O(10) bond length is 2.60 Å. The Sr(1)-O(12) bond length is 3.04 Å. The Sr(1)-O(13) bond length is 2.61 Å. The Sr(1)-O(3) bond length is 2.78 Å. The Sr(1)-O(4) bond length is 2.75 Å. The Sr(1)-O(6) bond length is 2.67 Å. The Sr(1)-O(7) bond length is 3.05 Å. The Sr(1)-O(9) bond length is 3.06 Å. There is one shorter (2.81 Å) and one longer (2.89 Å) Sr(1)-O(1) bond length. There is one shorter (2.66 Å) and one longer (3.12 Å) Sr(1)-O(11) bond length. In the second Sr site, Sr(2) is bonded to one O(13), one O(15), one O(2), one O(3), one O(4), one O(5), one O(7), one O(9), two equivalent O(12), and two equivalent O(8) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra,  a faceface with one Mg(1)O6 octahedra,  a faceface with one Mo(2)O6 octahedra,  a faceface with one Mo(3)O6 octahedra,  a faceface with one Fe(2)O6 octahedra, faces with two equivalent Mo(1)O6 octahedra, and faces with two equivalent Fe(1)O6 octahedra. The Sr(2)-O(13) bond length is 3.08 Å. The Sr(2)-O(15) bond length is 3.06 Å. The Sr(2)-O(2) bond length is 2.76 Å. The Sr(2)-O(3) bond length is 2.81 Å. The Sr(2)-O(4) bond length is 2.84 Å. The Sr(2)-O(5) bond length is 2.84 Å. The Sr(2)-O(7) bond length is 2.62 Å. The Sr(2)-O(9) bond length is 2.62 Å. There is one shorter (2.63 Å) and one longer (2.64 Å) Sr(2)-O(12) bond length. There is one shorter (3.03 Å) and one longer (3.10 Å) Sr(2)-O(8) bond length. In the third Sr site, Sr(3) is bonded to one O(11), one O(13), one O(2), one O(3), one O(4), one O(5), one O(7), one O(9), two equivalent O(14), and two equivalent O(8) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra,  a faceface with one Mg(1)O6 octahedra,  a faceface with one Mo(2)O6 octahedra,  a faceface with one Mo(3)O6 octahedra,  a faceface with one Fe(2)O6 octahedra, faces with two equivalent Mo(1)O6 octahedra, and faces with two equivalent Fe(1)O6 octahedra. The Sr(3)-O(11) bond length is 2.64 Å. The Sr(3)-O(13) bond length is 2.62 Å. The Sr(3)-O(2) bond length is 2.78 Å. The Sr(3)-O(3) bond length is 2.81 Å. The Sr(3)-O(4) bond length is 2.84 Å. The Sr(3)-O(5) bond length is 2.88 Å. The Sr(3)-O(7) bond length is 3.09 Å. The Sr(3)-O(9) bond length is 3.03 Å. Both Sr(3)-O(14) bond lengths are 3.05 Å. There is one shorter (2.59 Å) and one longer (2.66 Å) Sr(3)-O(8) bond length. In the fourth Sr site, Sr(4) is bonded to one O(10), one O(13), one O(14), one O(3), one O(4), one O(6), one O(7), one O(9), two equivalent O(1), and two equivalent O(15) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra,  a faceface with one Mo(1)O6 octahedra,  a faceface with one Mo(2)O6 octahedra,  a faceface with one Fe(1)O6 octahedra,  a faceface with one Fe(2)O6 octahedra, faces with two equivalent Mg(1)O6 octahedra, and faces with two equivalent Mo(3)O6 octahedra. The Sr(4)-O(10) bond length is 2.99 Å. The Sr(4)-O(13) bond length is 3.04 Å. The Sr(4)-O(14) bond length is 2.63 Å. The Sr(4)-O(3) bond length is 2.81 Å. The Sr(4)-O(4) bond length is 2.76 Å. The Sr(4)-O(6) bond length is 3.12 Å. The Sr(4)-O(7) bond length is 2.61 Å. The Sr(4)-O(9) bond length is 2.66 Å. There is one shorter (2.80 Å) and one longer (2.88 Å) Sr(4)-O(1) bond length. There is one shorter (2.65 Å) and one longer (3.09 Å) Sr(4)-O(15) bond length. In the fifth Sr site, Sr(5) is bonded to one O(11), one O(12), one O(14), one O(15), two equivalent O(10), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, faces with two equivalent Sr(5)O12 cuboctahedra, faces with two equivalent Mg(1)O6 octahedra, faces with two equivalent Mo(1)O6 octahedra, faces with two equivalent Mo(3)O6 octahedra, and faces with two equivalent Fe(1)O6 octahedra. The Sr(5)-O(11) bond length is 3.08 Å. The Sr(5)-O(12) bond length is 3.06 Å. The Sr(5)-O(14) bond length is 2.65 Å. The Sr(5)-O(15) bond length is 2.64 Å. There is one shorter (2.61 Å) and one longer (2.99 Å) Sr(5)-O(10) bond length. There is one shorter (2.75 Å) and one longer (2.79 Å) Sr(5)-O(2) bond length. There is one shorter (2.84 Å) and one longer (2.87 Å) Sr(5)-O(5) bond length. There is one shorter (2.64 Å) and one longer (3.13 Å) Sr(5)-O(6) bond length. Mg(1) is bonded to one O(1), one O(10), one O(11), one O(15), one O(2), and one O(9) atom to form MgO6 octahedra that share  a cornercorner with one Mo(2)O6 octahedra, corners with two equivalent Mo(1)O6 octahedra, corners with three equivalent Mo(3)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(4)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-19°. The Mg(1)-O(1) bond length is 2.12 Å. The Mg(1)-O(10) bond length is 2.04 Å. The Mg(1)-O(11) bond length is 2.09 Å. The Mg(1)-O(15) bond length is 2.09 Å. The Mg(1)-O(2) bond length is 2.06 Å. The Mg(1)-O(9) bond length is 2.09 Å. There are three inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(10), one O(12), one O(14), one O(2), one O(4), and one O(8) atom to form MoO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Mg(1)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-18°. The Mo(1)-O(10) bond length is 1.99 Å. The Mo(1)-O(12) bond length is 1.95 Å. The Mo(1)-O(14) bond length is 1.96 Å. The Mo(1)-O(2) bond length is 1.99 Å. The Mo(1)-O(4) bond length is 2.04 Å. The Mo(1)-O(8) bond length is 2.06 Å. In the second Mo site, Mo(2) is bonded to two equivalent O(13), two equivalent O(3), and two equivalent O(9) atoms to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-18°. Both Mo(2)-O(13) bond lengths are 2.02 Å. Both Mo(2)-O(3) bond lengths are 2.04 Å. Both Mo(2)-O(9) bond lengths are 1.93 Å. In the third Mo site, Mo(3) is bonded to one O(1), one O(11), one O(15), one O(5), one O(6), and one O(7) atom to form MoO6 octahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, corners with three equivalent Mg(1)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(3)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(4)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-19°. The Mo(3)-O(1) bond length is 1.93 Å. The Mo(3)-O(11) bond length is 1.93 Å. The Mo(3)-O(15) bond length is 1.93 Å. The Mo(3)-O(5) bond length is 1.97 Å. The Mo(3)-O(6) bond length is 1.97 Å. The Mo(3)-O(7) bond length is 1.97 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(12), one O(14), one O(3), one O(5), one O(6), and one O(8) atom to form FeO6 octahedra that share  a cornercorner with one Mo(2)O6 octahedra, corners with two equivalent Mo(3)O6 octahedra, corners with three equivalent Mo(1)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-19°. The Fe(1)-O(12) bond length is 2.07 Å. The Fe(1)-O(14) bond length is 2.05 Å. The Fe(1)-O(3) bond length is 2.00 Å. The Fe(1)-O(5) bond length is 2.08 Å. The Fe(1)-O(6) bond length is 2.06 Å. The Fe(1)-O(8) bond length is 1.96 Å. In the second Fe site, Fe(2) is bonded to two equivalent O(13), two equivalent O(4), and two equivalent O(7) atoms to form FeO6 octahedra that share corners with two equivalent Mo(1)O6 octahedra, corners with two equivalent Mo(2)O6 octahedra, corners with two equivalent Mo(3)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with two equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-18°. Both Fe(2)-O(13) bond lengths are 2.00 Å. Both Fe(2)-O(4) bond lengths are 2.01 Å. Both Fe(2)-O(7) bond lengths are 2.11 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(4), one Mg(1), and one Mo(3) atom to form distorted OSr4MgMo octahedra that share  a cornercorner with one O(5)Sr4FeMo octahedra,  a cornercorner with one O(2)Sr4MgMo octahedra, corners with two equivalent O(3)Sr4FeMo octahedra, corners with two equivalent O(4)Sr4FeMo octahedra,  an edgeedge with one O(3)Sr4FeMo octahedra,  an edgeedge with one O(4)Sr4FeMo octahedra, and edges with two equivalent O(1)Sr4MgMo octahedra. The corner-sharing octahedral tilt angles range from 2-4°. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), two equivalent Sr(5), one Mg(1), and one Mo(1) atom to form distorted OSr4MgMo octahedra that share  a cornercorner with one O(1)Sr4MgMo octahedra, corners with two equivalent O(5)Sr4FeMo octahedra, corners with three equivalent O(4)Sr4FeMo octahedra,  an edgeedge with one O(3)Sr4FeMo octahedra,  an edgeedge with one O(2)Sr4MgMo octahedra, and edges with two equivalent O(5)Sr4FeMo octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mo(2), and one Fe(1) atom to form distorted OSr4FeMo octahedra that share  a cornercorner with one O(3)Sr4FeMo octahedra, corners with two equivalent O(1)Sr4MgMo octahedra, corners with three equivalent O(5)Sr4FeMo octahedra,  an edgeedge with one O(1)Sr4MgMo octahedra,  an edgeedge with one O(2)Sr4MgMo octahedra, and edges with two equivalent O(4)Sr4FeMo octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mo(1), and one Fe(2) atom to form distorted OSr4FeMo octahedra that share  a cornercorner with one O(4)Sr4FeMo octahedra, corners with two equivalent O(1)Sr4MgMo octahedra, corners with three equivalent O(2)Sr4MgMo octahedra,  an edgeedge with one O(5)Sr4FeMo octahedra,  an edgeedge with one O(1)Sr4MgMo octahedra, and edges with two equivalent O(3)Sr4FeMo octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fifth O site, O(5) is bonded to one Sr(2), one Sr(3), two equivalent Sr(5), one Mo(3), and one Fe(1) atom to form distorted OSr4FeMo octahedra that share  a cornercorner with one O(1)Sr4MgMo octahedra, corners with two equivalent O(2)Sr4MgMo octahedra, corners with three equivalent O(3)Sr4FeMo octahedra,  an edgeedge with one O(4)Sr4FeMo octahedra,  an edgeedge with one O(5)Sr4FeMo octahedra, and edges with two equivalent O(2)Sr4MgMo octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(4), two equivalent Sr(5), one Mo(3), and one Fe(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mo(3), and one Fe(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Sr(2), two equivalent Sr(3), one Mo(1), and one Fe(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mg(1), and one Mo(2) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(4), two equivalent Sr(5), one Mg(1), and one Mo(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(5), two equivalent Sr(1), one Mg(1), and one Mo(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(5), two equivalent Sr(2), one Mo(1), and one Fe(1) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Mo(2), and one Fe(2) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(5), two equivalent Sr(3), one Mo(1), and one Fe(1) atom. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(5), two equivalent Sr(4), one Mg(1), and one Mo(3) atom.