Ca4MnFe3(SiO3)10 is Esseneite-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to one O(15), one O(22), one O(25), one O(26), one O(27), and one O(3) atom. In the second Ca site, Ca(2) is bonded in a 6-coordinate geometry to one O(16), one O(21), one O(25), one O(26), one O(28), and one O(4) atom. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(23), one O(29), one O(30), one O(6), and one O(7) atom. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(12), one O(2), one O(24), one O(29), one O(30), one O(5), one O(8), and one O(9) atom. Mn(1) is bonded to one O(1), one O(15), one O(3), one O(5), one O(6), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(9)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(3)O6 octahedra. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(11), one O(17), one O(25), one O(27), one O(4), and one O(7) atom to form distorted FeO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Si(10)O4 tetrahedra, and  an edgeedge with one Fe(3)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(12), one O(18), one O(26), one O(28), one O(3), and one O(8) atom to form FeO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, corners with two equivalent Si(9)O4 tetrahedra, and  an edgeedge with one Mn(1)O6 octahedra. In the third Fe site, Fe(3) is bonded to one O(16), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form FeO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(10)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. There are ten inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(29), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(9)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-67°. In the second Si site, Si(2) is bonded to one O(10), one O(12), one O(30), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Si(10)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-62°. In the third Si site, Si(3) is bonded to one O(19), one O(2), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-64°. In the fourth Si site, Si(4) is bonded to one O(1), one O(10), one O(20), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 36-63°. In the fifth Si site, Si(5) is bonded to one O(13), one O(19), one O(21), and one O(25) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles are 57°. In the sixth Si site, Si(6) is bonded to one O(14), one O(20), one O(22), and one O(26) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles are 56°. In the seventh Si site, Si(7) is bonded to one O(13), one O(15), one O(23), and one O(28) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(9)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-49°. In the eighth Si site, Si(8) is bonded to one O(14), one O(16), one O(24), and one O(27) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Si(10)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-49°. In the ninth Si site, Si(9) is bonded to one O(18), one O(23), one O(29), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-66°. In the tenth Si site, Si(10) is bonded to one O(17), one O(24), one O(30), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(3)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 27-61°. There are thirty inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Ca(3), one Mn(1), and one Si(4) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Ca(4), one Fe(3), and one Si(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ca(1), one Mn(1), one Fe(2), and one Si(9) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(2), one Fe(1), one Fe(3), and one Si(10) atom. In the fifth O site, O(5) is bonded to one Ca(4), one Mn(1), one Fe(3), and one Si(1) atom to form distorted OCaMnFeSi tetrahedra that share  a cornercorner with one O(7)CaFe2Si tetrahedra,  an edgeedge with one O(6)CaMnFeSi tetrahedra, and  an edgeedge with one O(8)CaMnFeSi tetrahedra. In the sixth O site, O(6) is bonded to one Ca(3), one Mn(1), one Fe(3), and one Si(2) atom to form distorted OCaMnFeSi tetrahedra that share  a cornercorner with one O(8)CaMnFeSi tetrahedra,  an edgeedge with one O(7)CaFe2Si tetrahedra, and  an edgeedge with one O(5)CaMnFeSi tetrahedra. In the seventh O site, O(7) is bonded to one Ca(3), one Fe(1), one Fe(3), and one Si(3) atom to form a mixture of distorted corner and edge-sharing OCaFe2Si tetrahedra. In the eighth O site, O(8) is bonded to one Ca(4), one Mn(1), one Fe(2), and one Si(4) atom to form a mixture of distorted corner and edge-sharing OCaMnFeSi tetrahedra. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ca(4), one Si(1), and one Si(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(3), one Si(2), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ca(3), one Fe(1), and one Si(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Ca(4), one Fe(2), and one Si(2) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Si(5) and one Si(7) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Si(6) and one Si(8) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Mn(1), and one Si(7) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Ca(2), one Fe(3), and one Si(8) atom. In the seventeenth O site, O(17) is bonded in a bent 150 degrees geometry to one Fe(1) and one Si(10) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one Fe(2) and one Si(9) atom. In the nineteenth O site, O(19) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(5) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(6) atom. In the twenty-first O site, O(21) is bonded in a distorted bent 120 degrees geometry to one Ca(2) and one Si(5) atom. In the twenty-second O site, O(22) is bonded in a bent 120 degrees geometry to one Ca(1) and one Si(6) atom. In the twenty-third O site, O(23) is bonded in a 2-coordinate geometry to one Ca(3), one Si(7), and one Si(9) atom. In the twenty-fourth O site, O(24) is bonded in a 2-coordinate geometry to one Ca(4), one Si(10), and one Si(8) atom. In the twenty-fifth O site, O(25) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Fe(1), and one Si(5) atom. In the twenty-sixth O site, O(26) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Fe(2), and one Si(6) atom. In the twenty-seventh O site, O(27) is bonded in a distorted trigonal planar geometry to one Ca(1), one Fe(1), and one Si(8) atom. In the twenty-eighth O site, O(28) is bonded in a distorted trigonal planar geometry to one Ca(2), one Fe(2), and one Si(7) atom. In the twenty-ninth O site, O(29) is bonded in a distorted bent 150 degrees geometry to one Ca(3), one Ca(4), one Si(1), and one Si(9) atom. In the thirtieth O site, O(30) is bonded in a 2-coordinate geometry to one Ca(3), one Ca(4), one Si(10), and one Si(2) atom.
Ca4MnFe3(SiO3)10 is Esseneite-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to one O(15), one O(22), one O(25), one O(26), one O(27), and one O(3) atom. The Ca(1)-O(15) bond length is 2.46 Å. The Ca(1)-O(22) bond length is 2.16 Å. The Ca(1)-O(25) bond length is 2.75 Å. The Ca(1)-O(26) bond length is 2.37 Å. The Ca(1)-O(27) bond length is 2.37 Å. The Ca(1)-O(3) bond length is 2.54 Å. In the second Ca site, Ca(2) is bonded in a 6-coordinate geometry to one O(16), one O(21), one O(25), one O(26), one O(28), and one O(4) atom. The Ca(2)-O(16) bond length is 2.54 Å. The Ca(2)-O(21) bond length is 2.16 Å. The Ca(2)-O(25) bond length is 2.36 Å. The Ca(2)-O(26) bond length is 2.68 Å. The Ca(2)-O(28) bond length is 2.34 Å. The Ca(2)-O(4) bond length is 2.65 Å. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(23), one O(29), one O(30), one O(6), and one O(7) atom. The Ca(3)-O(1) bond length is 2.42 Å. The Ca(3)-O(10) bond length is 2.43 Å. The Ca(3)-O(11) bond length is 2.36 Å. The Ca(3)-O(23) bond length is 2.67 Å. The Ca(3)-O(29) bond length is 2.50 Å. The Ca(3)-O(30) bond length is 2.95 Å. The Ca(3)-O(6) bond length is 2.36 Å. The Ca(3)-O(7) bond length is 2.39 Å. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(12), one O(2), one O(24), one O(29), one O(30), one O(5), one O(8), and one O(9) atom. The Ca(4)-O(12) bond length is 2.36 Å. The Ca(4)-O(2) bond length is 2.42 Å. The Ca(4)-O(24) bond length is 2.72 Å. The Ca(4)-O(29) bond length is 2.99 Å. The Ca(4)-O(30) bond length is 2.47 Å. The Ca(4)-O(5) bond length is 2.37 Å. The Ca(4)-O(8) bond length is 2.37 Å. The Ca(4)-O(9) bond length is 2.40 Å. Mn(1) is bonded to one O(1), one O(15), one O(3), one O(5), one O(6), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(9)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(3)O6 octahedra. The Mn(1)-O(1) bond length is 2.04 Å. The Mn(1)-O(15) bond length is 2.00 Å. The Mn(1)-O(3) bond length is 2.15 Å. The Mn(1)-O(5) bond length is 2.33 Å. The Mn(1)-O(6) bond length is 2.27 Å. The Mn(1)-O(8) bond length is 2.13 Å. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(11), one O(17), one O(25), one O(27), one O(4), and one O(7) atom to form distorted FeO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Si(10)O4 tetrahedra, and  an edgeedge with one Fe(3)O6 octahedra. The Fe(1)-O(11) bond length is 2.03 Å. The Fe(1)-O(17) bond length is 1.90 Å. The Fe(1)-O(25) bond length is 2.01 Å. The Fe(1)-O(27) bond length is 1.94 Å. The Fe(1)-O(4) bond length is 2.29 Å. The Fe(1)-O(7) bond length is 2.25 Å. In the second Fe site, Fe(2) is bonded to one O(12), one O(18), one O(26), one O(28), one O(3), and one O(8) atom to form FeO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra, corners with two equivalent Si(9)O4 tetrahedra, and  an edgeedge with one Mn(1)O6 octahedra. The Fe(2)-O(12) bond length is 2.05 Å. The Fe(2)-O(18) bond length is 1.91 Å. The Fe(2)-O(26) bond length is 2.03 Å. The Fe(2)-O(28) bond length is 1.93 Å. The Fe(2)-O(3) bond length is 2.22 Å. The Fe(2)-O(8) bond length is 2.25 Å. In the third Fe site, Fe(3) is bonded to one O(16), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form FeO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(10)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The Fe(3)-O(16) bond length is 1.94 Å. The Fe(3)-O(2) bond length is 2.02 Å. The Fe(3)-O(4) bond length is 2.02 Å. The Fe(3)-O(5) bond length is 2.13 Å. The Fe(3)-O(6) bond length is 2.22 Å. The Fe(3)-O(7) bond length is 2.14 Å. There are ten inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(29), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(9)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-67°. The Si(1)-O(11) bond length is 1.61 Å. The Si(1)-O(29) bond length is 1.67 Å. The Si(1)-O(5) bond length is 1.65 Å. The Si(1)-O(9) bond length is 1.65 Å. In the second Si site, Si(2) is bonded to one O(10), one O(12), one O(30), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Si(10)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-62°. The Si(2)-O(10) bond length is 1.65 Å. The Si(2)-O(12) bond length is 1.62 Å. The Si(2)-O(30) bond length is 1.67 Å. The Si(2)-O(6) bond length is 1.64 Å. In the third Si site, Si(3) is bonded to one O(19), one O(2), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-64°. The Si(3)-O(19) bond length is 1.61 Å. The Si(3)-O(2) bond length is 1.64 Å. The Si(3)-O(7) bond length is 1.66 Å. The Si(3)-O(9) bond length is 1.68 Å. In the fourth Si site, Si(4) is bonded to one O(1), one O(10), one O(20), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 36-63°. The Si(4)-O(1) bond length is 1.64 Å. The Si(4)-O(10) bond length is 1.68 Å. The Si(4)-O(20) bond length is 1.62 Å. The Si(4)-O(8) bond length is 1.67 Å. In the fifth Si site, Si(5) is bonded to one O(13), one O(19), one O(21), and one O(25) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles are 57°. The Si(5)-O(13) bond length is 1.68 Å. The Si(5)-O(19) bond length is 1.66 Å. The Si(5)-O(21) bond length is 1.59 Å. The Si(5)-O(25) bond length is 1.66 Å. In the sixth Si site, Si(6) is bonded to one O(14), one O(20), one O(22), and one O(26) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles are 56°. The Si(6)-O(14) bond length is 1.68 Å. The Si(6)-O(20) bond length is 1.65 Å. The Si(6)-O(22) bond length is 1.59 Å. The Si(6)-O(26) bond length is 1.66 Å. In the seventh Si site, Si(7) is bonded to one O(13), one O(15), one O(23), and one O(28) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(9)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-49°. The Si(7)-O(13) bond length is 1.65 Å. The Si(7)-O(15) bond length is 1.62 Å. The Si(7)-O(23) bond length is 1.68 Å. The Si(7)-O(28) bond length is 1.63 Å. In the eighth Si site, Si(8) is bonded to one O(14), one O(16), one O(24), and one O(27) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Si(10)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-49°. The Si(8)-O(14) bond length is 1.65 Å. The Si(8)-O(16) bond length is 1.63 Å. The Si(8)-O(24) bond length is 1.67 Å. The Si(8)-O(27) bond length is 1.63 Å. In the ninth Si site, Si(9) is bonded to one O(18), one O(23), one O(29), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-66°. The Si(9)-O(18) bond length is 1.59 Å. The Si(9)-O(23) bond length is 1.67 Å. The Si(9)-O(29) bond length is 1.69 Å. The Si(9)-O(3) bond length is 1.64 Å. In the tenth Si site, Si(10) is bonded to one O(17), one O(24), one O(30), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(3)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 27-61°. The Si(10)-O(17) bond length is 1.59 Å. The Si(10)-O(24) bond length is 1.66 Å. The Si(10)-O(30) bond length is 1.68 Å. The Si(10)-O(4) bond length is 1.65 Å. There are thirty inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Ca(3), one Mn(1), and one Si(4) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Ca(4), one Fe(3), and one Si(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ca(1), one Mn(1), one Fe(2), and one Si(9) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(2), one Fe(1), one Fe(3), and one Si(10) atom. In the fifth O site, O(5) is bonded to one Ca(4), one Mn(1), one Fe(3), and one Si(1) atom to form distorted OCaMnFeSi tetrahedra that share  a cornercorner with one O(7)CaFe2Si tetrahedra,  an edgeedge with one O(6)CaMnFeSi tetrahedra, and  an edgeedge with one O(8)CaMnFeSi tetrahedra. In the sixth O site, O(6) is bonded to one Ca(3), one Mn(1), one Fe(3), and one Si(2) atom to form distorted OCaMnFeSi tetrahedra that share  a cornercorner with one O(8)CaMnFeSi tetrahedra,  an edgeedge with one O(7)CaFe2Si tetrahedra, and  an edgeedge with one O(5)CaMnFeSi tetrahedra. In the seventh O site, O(7) is bonded to one Ca(3), one Fe(1), one Fe(3), and one Si(3) atom to form a mixture of distorted corner and edge-sharing OCaFe2Si tetrahedra. In the eighth O site, O(8) is bonded to one Ca(4), one Mn(1), one Fe(2), and one Si(4) atom to form a mixture of distorted corner and edge-sharing OCaMnFeSi tetrahedra. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ca(4), one Si(1), and one Si(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(3), one Si(2), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ca(3), one Fe(1), and one Si(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Ca(4), one Fe(2), and one Si(2) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Si(5) and one Si(7) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Si(6) and one Si(8) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Mn(1), and one Si(7) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Ca(2), one Fe(3), and one Si(8) atom. In the seventeenth O site, O(17) is bonded in a bent 150 degrees geometry to one Fe(1) and one Si(10) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one Fe(2) and one Si(9) atom. In the nineteenth O site, O(19) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(5) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(6) atom. In the twenty-first O site, O(21) is bonded in a distorted bent 120 degrees geometry to one Ca(2) and one Si(5) atom. In the twenty-second O site, O(22) is bonded in a bent 120 degrees geometry to one Ca(1) and one Si(6) atom. In the twenty-third O site, O(23) is bonded in a 2-coordinate geometry to one Ca(3), one Si(7), and one Si(9) atom. In the twenty-fourth O site, O(24) is bonded in a 2-coordinate geometry to one Ca(4), one Si(10), and one Si(8) atom. In the twenty-fifth O site, O(25) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Fe(1), and one Si(5) atom. In the twenty-sixth O site, O(26) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Fe(2), and one Si(6) atom. In the twenty-seventh O site, O(27) is bonded in a distorted trigonal planar geometry to one Ca(1), one Fe(1), and one Si(8) atom. In the twenty-eighth O site, O(28) is bonded in a distorted trigonal planar geometry to one Ca(2), one Fe(2), and one Si(7) atom. In the twenty-ninth O site, O(29) is bonded in a distorted bent 150 degrees geometry to one Ca(3), one Ca(4), one Si(1), and one Si(9) atom. In the thirtieth O site, O(30) is bonded in a 2-coordinate geometry to one Ca(3), one Ca(4), one Si(10), and one Si(2) atom.