MgFe4(PO3)12 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(24), one O(29), one O(30), one O(33), and one O(4) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one P(12)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  an edgeedge with one Fe(1)O6 octahedra, and  an edgeedge with one P(2)O4 tetrahedra. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(3), one O(33), one O(34), one O(4), and one O(8) atom to form FeO6 octahedra that share  a cornercorner with one P(11)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the second Fe site, Fe(2) is bonded in a 6-coordinate geometry to one O(19), one O(24), one O(25), one O(29), one O(30), and one O(36) atom. In the third Fe site, Fe(3) is bonded to one O(15), one O(16), one O(20), one O(21), one O(26), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(11)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra, and  a cornercorner with one P(9)O4 tetrahedra. In the fourth Fe site, Fe(4) is bonded to one O(11), one O(12), one O(18), one O(27), one O(6), and one O(7) atom to form FeO6 octahedra that share  a cornercorner with one P(10)O4 tetrahedra,  a cornercorner with one P(12)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra, and  a cornercorner with one P(8)O4 tetrahedra. There are twelve inequivalent P sites. In the first P site, P(1) is bonded to one O(26), one O(31), one O(35), and one O(36) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one P(12)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. In the second P site, P(2) is bonded to one O(23), one O(29), one O(32), and one O(33) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one P(10)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 21°. In the third P site, P(3) is bonded to one O(2), one O(30), one O(31), and one O(34) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 22°. In the fourth P site, P(4) is bonded to one O(27), one O(28), one O(3), and one O(32) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(11)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-53°. In the fifth P site, P(5) is bonded to one O(10), one O(2), one O(4), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(9)O4 tetrahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 42-47°. In the sixth P site, P(6) is bonded to one O(13), one O(17), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(10)O4 tetrahedra, and  a cornercorner with one P(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-53°. In the seventh P site, P(7) is bonded to one O(11), one O(14), one O(15), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(12)O4 tetrahedra, and  a cornercorner with one P(9)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 5-40°. In the eighth P site, P(8) is bonded to one O(12), one O(13), one O(16), and one O(22) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(11)O4 tetrahedra, and  a cornercorner with one P(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 8-34°. In the ninth P site, P(9) is bonded to one O(10), one O(14), one O(19), and one O(21) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one P(5)O4 tetrahedra, and  a cornercorner with one P(7)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. In the tenth P site, P(10) is bonded to one O(17), one O(18), one O(23), and one O(25) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(6)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. In the eleventh P site, P(11) is bonded to one O(1), one O(20), one O(22), and one O(28) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra, and  a cornercorner with one P(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 39-48°. In the twelfth P site, P(12) is bonded to one O(24), one O(35), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 33°. There are thirty-six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(11) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one P(3) and one P(5) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Fe(1) and one P(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Fe(1), and one P(5) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one P(12) and one P(7) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Fe(4) and one P(6) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Fe(4) and one P(12) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Fe(1) and one P(6) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Fe(3) and one P(5) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one P(5) and one P(9) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one Fe(4) and one P(7) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Fe(4) and one P(8) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one P(6) and one P(8) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one P(7) and one P(9) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one Fe(3) and one P(7) atom. In the sixteenth O site, O(16) is bonded in a linear geometry to one Fe(3) and one P(8) atom. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one P(10) and one P(6) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 120 degrees geometry to one Fe(4) and one P(10) atom. In the nineteenth O site, O(19) is bonded in a distorted bent 120 degrees geometry to one Fe(2) and one P(9) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Fe(3) and one P(11) atom. In the twenty-first O site, O(21) is bonded in a distorted bent 120 degrees geometry to one Fe(3) and one P(9) atom. In the twenty-second O site, O(22) is bonded in a bent 150 degrees geometry to one P(11) and one P(8) atom. In the twenty-third O site, O(23) is bonded in a bent 150 degrees geometry to one P(10) and one P(2) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one Mg(1), one Fe(2), and one P(12) atom. In the twenty-fifth O site, O(25) is bonded in a bent 120 degrees geometry to one Fe(2) and one P(10) atom. In the twenty-sixth O site, O(26) is bonded in a distorted bent 150 degrees geometry to one Fe(3) and one P(1) atom. In the twenty-seventh O site, O(27) is bonded in a distorted bent 120 degrees geometry to one Fe(4) and one P(4) atom. In the twenty-eighth O site, O(28) is bonded in a bent 120 degrees geometry to one P(11) and one P(4) atom. In the twenty-ninth O site, O(29) is bonded in a distorted T-shaped geometry to one Mg(1), one Fe(2), and one P(2) atom. In the thirtieth O site, O(30) is bonded in a 3-coordinate geometry to one Mg(1), one Fe(2), and one P(3) atom. In the thirty-first O site, O(31) is bonded in a distorted bent 150 degrees geometry to one P(1) and one P(3) atom. In the thirty-second O site, O(32) is bonded in a bent 150 degrees geometry to one P(2) and one P(4) atom. In the thirty-third O site, O(33) is bonded in a distorted T-shaped geometry to one Mg(1), one Fe(1), and one P(2) atom. In the thirty-fourth O site, O(34) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(3) atom. In the thirty-fifth O site, O(35) is bonded in a bent 120 degrees geometry to one P(1) and one P(12) atom. In the thirty-sixth O site, O(36) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one P(1) atom.
MgFe4(PO3)12 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(24), one O(29), one O(30), one O(33), and one O(4) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one P(12)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  an edgeedge with one Fe(1)O6 octahedra, and  an edgeedge with one P(2)O4 tetrahedra. The Mg(1)-O(24) bond length is 2.03 Å. The Mg(1)-O(29) bond length is 2.05 Å. The Mg(1)-O(30) bond length is 2.00 Å. The Mg(1)-O(33) bond length is 2.16 Å. The Mg(1)-O(4) bond length is 1.93 Å. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(3), one O(33), one O(34), one O(4), and one O(8) atom to form FeO6 octahedra that share  a cornercorner with one P(11)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The Fe(1)-O(1) bond length is 2.12 Å. The Fe(1)-O(3) bond length is 2.11 Å. The Fe(1)-O(33) bond length is 2.24 Å. The Fe(1)-O(34) bond length is 2.10 Å. The Fe(1)-O(4) bond length is 2.29 Å. The Fe(1)-O(8) bond length is 2.10 Å. In the second Fe site, Fe(2) is bonded in a 6-coordinate geometry to one O(19), one O(24), one O(25), one O(29), one O(30), and one O(36) atom. The Fe(2)-O(19) bond length is 2.03 Å. The Fe(2)-O(24) bond length is 2.48 Å. The Fe(2)-O(25) bond length is 2.04 Å. The Fe(2)-O(29) bond length is 2.30 Å. The Fe(2)-O(30) bond length is 2.35 Å. The Fe(2)-O(36) bond length is 2.01 Å. In the third Fe site, Fe(3) is bonded to one O(15), one O(16), one O(20), one O(21), one O(26), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(11)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra,  a cornercorner with one P(8)O4 tetrahedra, and  a cornercorner with one P(9)O4 tetrahedra. The Fe(3)-O(15) bond length is 2.03 Å. The Fe(3)-O(16) bond length is 2.17 Å. The Fe(3)-O(20) bond length is 2.03 Å. The Fe(3)-O(21) bond length is 2.06 Å. The Fe(3)-O(26) bond length is 1.99 Å. The Fe(3)-O(9) bond length is 2.01 Å. In the fourth Fe site, Fe(4) is bonded to one O(11), one O(12), one O(18), one O(27), one O(6), and one O(7) atom to form FeO6 octahedra that share  a cornercorner with one P(10)O4 tetrahedra,  a cornercorner with one P(12)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra, and  a cornercorner with one P(8)O4 tetrahedra. The Fe(4)-O(11) bond length is 2.12 Å. The Fe(4)-O(12) bond length is 2.03 Å. The Fe(4)-O(18) bond length is 2.02 Å. The Fe(4)-O(27) bond length is 2.05 Å. The Fe(4)-O(6) bond length is 2.03 Å. The Fe(4)-O(7) bond length is 2.05 Å. There are twelve inequivalent P sites. In the first P site, P(1) is bonded to one O(26), one O(31), one O(35), and one O(36) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one P(12)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. The P(1)-O(26) bond length is 1.51 Å. The P(1)-O(31) bond length is 1.60 Å. The P(1)-O(35) bond length is 1.61 Å. The P(1)-O(36) bond length is 1.49 Å. In the second P site, P(2) is bonded to one O(23), one O(29), one O(32), and one O(33) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one P(10)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 21°. The P(2)-O(23) bond length is 1.58 Å. The P(2)-O(29) bond length is 1.52 Å. The P(2)-O(32) bond length is 1.59 Å. The P(2)-O(33) bond length is 1.51 Å. In the third P site, P(3) is bonded to one O(2), one O(30), one O(31), and one O(34) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 22°. The P(3)-O(2) bond length is 1.63 Å. The P(3)-O(30) bond length is 1.52 Å. The P(3)-O(31) bond length is 1.60 Å. The P(3)-O(34) bond length is 1.48 Å. In the fourth P site, P(4) is bonded to one O(27), one O(28), one O(3), and one O(32) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(11)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-53°. The P(4)-O(27) bond length is 1.51 Å. The P(4)-O(28) bond length is 1.61 Å. The P(4)-O(3) bond length is 1.49 Å. The P(4)-O(32) bond length is 1.63 Å. In the fifth P site, P(5) is bonded to one O(10), one O(2), one O(4), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(9)O4 tetrahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 42-47°. The P(5)-O(10) bond length is 1.61 Å. The P(5)-O(2) bond length is 1.60 Å. The P(5)-O(4) bond length is 1.51 Å. The P(5)-O(9) bond length is 1.49 Å. In the sixth P site, P(6) is bonded to one O(13), one O(17), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(10)O4 tetrahedra, and  a cornercorner with one P(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-53°. The P(6)-O(13) bond length is 1.62 Å. The P(6)-O(17) bond length is 1.62 Å. The P(6)-O(6) bond length is 1.51 Å. The P(6)-O(8) bond length is 1.49 Å. In the seventh P site, P(7) is bonded to one O(11), one O(14), one O(15), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(12)O4 tetrahedra, and  a cornercorner with one P(9)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 5-40°. The P(7)-O(11) bond length is 1.50 Å. The P(7)-O(14) bond length is 1.62 Å. The P(7)-O(15) bond length is 1.51 Å. The P(7)-O(5) bond length is 1.61 Å. In the eighth P site, P(8) is bonded to one O(12), one O(13), one O(16), and one O(22) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(11)O4 tetrahedra, and  a cornercorner with one P(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 8-34°. The P(8)-O(12) bond length is 1.51 Å. The P(8)-O(13) bond length is 1.62 Å. The P(8)-O(16) bond length is 1.50 Å. The P(8)-O(22) bond length is 1.61 Å. In the ninth P site, P(9) is bonded to one O(10), one O(14), one O(19), and one O(21) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one P(5)O4 tetrahedra, and  a cornercorner with one P(7)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. The P(9)-O(10) bond length is 1.62 Å. The P(9)-O(14) bond length is 1.61 Å. The P(9)-O(19) bond length is 1.49 Å. The P(9)-O(21) bond length is 1.51 Å. In the tenth P site, P(10) is bonded to one O(17), one O(18), one O(23), and one O(25) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(6)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. The P(10)-O(17) bond length is 1.61 Å. The P(10)-O(18) bond length is 1.51 Å. The P(10)-O(23) bond length is 1.62 Å. The P(10)-O(25) bond length is 1.49 Å. In the eleventh P site, P(11) is bonded to one O(1), one O(20), one O(22), and one O(28) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra, and  a cornercorner with one P(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 39-48°. The P(11)-O(1) bond length is 1.49 Å. The P(11)-O(20) bond length is 1.51 Å. The P(11)-O(22) bond length is 1.60 Å. The P(11)-O(28) bond length is 1.64 Å. In the twelfth P site, P(12) is bonded to one O(24), one O(35), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(7)O4 tetrahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 33°. The P(12)-O(24) bond length is 1.51 Å. The P(12)-O(35) bond length is 1.62 Å. The P(12)-O(5) bond length is 1.60 Å. The P(12)-O(7) bond length is 1.49 Å. There are thirty-six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(11) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one P(3) and one P(5) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Fe(1) and one P(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Fe(1), and one P(5) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one P(12) and one P(7) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Fe(4) and one P(6) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Fe(4) and one P(12) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Fe(1) and one P(6) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Fe(3) and one P(5) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one P(5) and one P(9) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one Fe(4) and one P(7) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Fe(4) and one P(8) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one P(6) and one P(8) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one P(7) and one P(9) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one Fe(3) and one P(7) atom. In the sixteenth O site, O(16) is bonded in a linear geometry to one Fe(3) and one P(8) atom. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one P(10) and one P(6) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 120 degrees geometry to one Fe(4) and one P(10) atom. In the nineteenth O site, O(19) is bonded in a distorted bent 120 degrees geometry to one Fe(2) and one P(9) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Fe(3) and one P(11) atom. In the twenty-first O site, O(21) is bonded in a distorted bent 120 degrees geometry to one Fe(3) and one P(9) atom. In the twenty-second O site, O(22) is bonded in a bent 150 degrees geometry to one P(11) and one P(8) atom. In the twenty-third O site, O(23) is bonded in a bent 150 degrees geometry to one P(10) and one P(2) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one Mg(1), one Fe(2), and one P(12) atom. In the twenty-fifth O site, O(25) is bonded in a bent 120 degrees geometry to one Fe(2) and one P(10) atom. In the twenty-sixth O site, O(26) is bonded in a distorted bent 150 degrees geometry to one Fe(3) and one P(1) atom. In the twenty-seventh O site, O(27) is bonded in a distorted bent 120 degrees geometry to one Fe(4) and one P(4) atom. In the twenty-eighth O site, O(28) is bonded in a bent 120 degrees geometry to one P(11) and one P(4) atom. In the twenty-ninth O site, O(29) is bonded in a distorted T-shaped geometry to one Mg(1), one Fe(2), and one P(2) atom. In the thirtieth O site, O(30) is bonded in a 3-coordinate geometry to one Mg(1), one Fe(2), and one P(3) atom. In the thirty-first O site, O(31) is bonded in a distorted bent 150 degrees geometry to one P(1) and one P(3) atom. In the thirty-second O site, O(32) is bonded in a bent 150 degrees geometry to one P(2) and one P(4) atom. In the thirty-third O site, O(33) is bonded in a distorted T-shaped geometry to one Mg(1), one Fe(1), and one P(2) atom. In the thirty-fourth O site, O(34) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(3) atom. In the thirty-fifth O site, O(35) is bonded in a bent 120 degrees geometry to one P(1) and one P(12) atom. In the thirty-sixth O site, O(36) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one P(1) atom.