KNaCaMg5(SiO3)8 is Esseneite-derived structured and crystallizes in the triclinic P1 space group. K(1) is bonded in a 10-coordinate geometry to one O(1), one O(19), one O(2), one O(20), one O(21), one O(22), one O(23), one O(24), one O(3), and one O(4) atom. Na(1) is bonded in a 8-coordinate geometry to one O(16), one O(17), one O(2), one O(20), one O(21), one O(3), one O(5), and one O(8) atom. Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(15), one O(18), one O(19), one O(22), one O(4), one O(6), and one O(7) atom. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(10), one O(11), one O(14), one O(5), one O(8), and one O(9) atom to form distorted MgO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with two equivalent Mg(4)O6 octahedra. In the second Mg site, Mg(2) is bonded to one O(10), one O(12), one O(13), one O(6), one O(7), and one O(9) atom to form distorted MgO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with two equivalent Mg(5)O6 octahedra. In the third Mg site, Mg(3) is bonded to one O(10), one O(11), one O(12), one O(13), one O(14), and one O(9) atom to form distorted MgO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  an edgeedge with one Mg(4)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mg(2)O6 octahedra. In the fourth Mg site, Mg(4) is bonded to one O(11), one O(14), one O(16), one O(17), one O(5), and one O(8) atom to form MgO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(3)O6 octahedra, and edges with two equivalent Mg(1)O6 octahedra. In the fifth Mg site, Mg(5) is bonded to one O(12), one O(13), one O(15), one O(18), one O(6), and one O(7) atom to form MgO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(3)O6 octahedra, and edges with two equivalent Mg(2)O6 octahedra. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(11), one O(19), and one O(23) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. In the second Si site, Si(2) is bonded to one O(12), one O(2), one O(20), and one O(23) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. In the third Si site, Si(3) is bonded to one O(13), one O(21), one O(24), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-62°. In the fourth Si site, Si(4) is bonded to one O(14), one O(22), one O(24), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. In the fifth Si site, Si(5) is bonded to one O(1), one O(15), one O(19), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-54°. In the sixth Si site, Si(6) is bonded to one O(16), one O(2), one O(20), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-57°. In the seventh Si site, Si(7) is bonded to one O(17), one O(21), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra, and corners with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-56°. In the eighth Si site, Si(8) is bonded to one O(18), one O(22), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra, and corners with two equivalent Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-54°. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(1), and one Si(5) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(2), and one Si(6) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(3), and one Si(7) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(4), and one Si(8) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Mg(1), one Mg(4), and one Si(5) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Mg(2), one Mg(5), and one Si(6) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Mg(2), one Mg(5), and one Si(7) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Mg(1), one Mg(4), and one Si(8) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Mg(1), one Mg(2), one Mg(3), and one O(10) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Mg(1), one Mg(2), one Mg(3), and one O(9) atom. In the eleventh O site, O(11) is bonded to one Mg(1), one Mg(3), one Mg(4), and one Si(1) atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the twelfth O site, O(12) is bonded to one Mg(2), one Mg(3), one Mg(5), and one Si(2) atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the thirteenth O site, O(13) is bonded to one Mg(2), one Mg(3), one Mg(5), and one Si(3) atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the fourteenth O site, O(14) is bonded to one Mg(1), one Mg(3), one Mg(4), and one Si(4) atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Ca(1), one Mg(5), and one Si(5) atom. In the sixteenth O site, O(16) is bonded in a distorted T-shaped geometry to one Na(1), one Mg(4), and one Si(6) atom. In the seventeenth O site, O(17) is bonded in a distorted T-shaped geometry to one Na(1), one Mg(4), and one Si(7) atom. In the eighteenth O site, O(18) is bonded in a distorted T-shaped geometry to one Ca(1), one Mg(5), and one Si(8) atom. In the nineteenth O site, O(19) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(1), and one Si(5) atom. In the twentieth O site, O(20) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(2), and one Si(6) atom. In the twenty-first O site, O(21) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(3), and one Si(7) atom. In the twenty-second O site, O(22) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(4), and one Si(8) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one K(1), one Si(1), and one Si(2) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one K(1), one Si(3), and one Si(4) atom.
KNaCaMg5(SiO3)8 is Esseneite-derived structured and crystallizes in the triclinic P1 space group. K(1) is bonded in a 10-coordinate geometry to one O(1), one O(19), one O(2), one O(20), one O(21), one O(22), one O(23), one O(24), one O(3), and one O(4) atom. The K(1)-O(1) bond length is 3.17 Å. The K(1)-O(19) bond length is 3.08 Å. The K(1)-O(2) bond length is 3.05 Å. The K(1)-O(20) bond length is 2.94 Å. The K(1)-O(21) bond length is 2.93 Å. The K(1)-O(22) bond length is 3.07 Å. The K(1)-O(23) bond length is 2.62 Å. The K(1)-O(24) bond length is 2.62 Å. The K(1)-O(3) bond length is 2.99 Å. The K(1)-O(4) bond length is 3.09 Å. Na(1) is bonded in a 8-coordinate geometry to one O(16), one O(17), one O(2), one O(20), one O(21), one O(3), one O(5), and one O(8) atom. The Na(1)-O(16) bond length is 2.36 Å. The Na(1)-O(17) bond length is 2.37 Å. The Na(1)-O(2) bond length is 2.72 Å. The Na(1)-O(20) bond length is 2.77 Å. The Na(1)-O(21) bond length is 2.78 Å. The Na(1)-O(3) bond length is 2.72 Å. The Na(1)-O(5) bond length is 2.46 Å. The Na(1)-O(8) bond length is 2.46 Å. Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(15), one O(18), one O(19), one O(22), one O(4), one O(6), and one O(7) atom. The Ca(1)-O(1) bond length is 2.62 Å. The Ca(1)-O(15) bond length is 2.33 Å. The Ca(1)-O(18) bond length is 2.33 Å. The Ca(1)-O(19) bond length is 2.67 Å. The Ca(1)-O(22) bond length is 2.67 Å. The Ca(1)-O(4) bond length is 2.63 Å. The Ca(1)-O(6) bond length is 2.43 Å. The Ca(1)-O(7) bond length is 2.43 Å. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(10), one O(11), one O(14), one O(5), one O(8), and one O(9) atom to form distorted MgO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with two equivalent Mg(4)O6 octahedra. The Mg(1)-O(10) bond length is 2.00 Å. The Mg(1)-O(11) bond length is 2.13 Å. The Mg(1)-O(14) bond length is 2.12 Å. The Mg(1)-O(5) bond length is 1.97 Å. The Mg(1)-O(8) bond length is 1.97 Å. The Mg(1)-O(9) bond length is 2.00 Å. In the second Mg site, Mg(2) is bonded to one O(10), one O(12), one O(13), one O(6), one O(7), and one O(9) atom to form distorted MgO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  an edgeedge with one Mg(1)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with two equivalent Mg(5)O6 octahedra. The Mg(2)-O(10) bond length is 1.99 Å. The Mg(2)-O(12) bond length is 2.13 Å. The Mg(2)-O(13) bond length is 2.12 Å. The Mg(2)-O(6) bond length is 1.99 Å. The Mg(2)-O(7) bond length is 2.00 Å. The Mg(2)-O(9) bond length is 1.99 Å. In the third Mg site, Mg(3) is bonded to one O(10), one O(11), one O(12), one O(13), one O(14), and one O(9) atom to form distorted MgO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  an edgeedge with one Mg(4)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mg(2)O6 octahedra. The Mg(3)-O(10) bond length is 2.24 Å. The Mg(3)-O(11) bond length is 2.09 Å. The Mg(3)-O(12) bond length is 2.10 Å. The Mg(3)-O(13) bond length is 2.10 Å. The Mg(3)-O(14) bond length is 2.09 Å. The Mg(3)-O(9) bond length is 2.24 Å. In the fourth Mg site, Mg(4) is bonded to one O(11), one O(14), one O(16), one O(17), one O(5), and one O(8) atom to form MgO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(3)O6 octahedra, and edges with two equivalent Mg(1)O6 octahedra. The Mg(4)-O(11) bond length is 2.16 Å. The Mg(4)-O(14) bond length is 2.16 Å. The Mg(4)-O(16) bond length is 1.98 Å. The Mg(4)-O(17) bond length is 1.98 Å. The Mg(4)-O(5) bond length is 2.10 Å. The Mg(4)-O(8) bond length is 2.10 Å. In the fifth Mg site, Mg(5) is bonded to one O(12), one O(13), one O(15), one O(18), one O(6), and one O(7) atom to form MgO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra,  a cornercorner with one Si(7)O4 tetrahedra,  a cornercorner with one Si(8)O4 tetrahedra,  an edgeedge with one Mg(3)O6 octahedra, and edges with two equivalent Mg(2)O6 octahedra. The Mg(5)-O(12) bond length is 2.10 Å. The Mg(5)-O(13) bond length is 2.11 Å. The Mg(5)-O(15) bond length is 2.00 Å. The Mg(5)-O(18) bond length is 2.00 Å. The Mg(5)-O(6) bond length is 2.11 Å. The Mg(5)-O(7) bond length is 2.10 Å. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(11), one O(19), and one O(23) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. The Si(1)-O(1) bond length is 1.63 Å. The Si(1)-O(11) bond length is 1.59 Å. The Si(1)-O(19) bond length is 1.65 Å. The Si(1)-O(23) bond length is 1.64 Å. In the second Si site, Si(2) is bonded to one O(12), one O(2), one O(20), and one O(23) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and corners with two equivalent Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. The Si(2)-O(12) bond length is 1.60 Å. The Si(2)-O(2) bond length is 1.62 Å. The Si(2)-O(20) bond length is 1.63 Å. The Si(2)-O(23) bond length is 1.64 Å. In the third Si site, Si(3) is bonded to one O(13), one O(21), one O(24), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(7)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-62°. The Si(3)-O(13) bond length is 1.60 Å. The Si(3)-O(21) bond length is 1.63 Å. The Si(3)-O(24) bond length is 1.65 Å. The Si(3)-O(3) bond length is 1.62 Å. In the fourth Si site, Si(4) is bonded to one O(14), one O(22), one O(24), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(3)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Si(8)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-62°. The Si(4)-O(14) bond length is 1.59 Å. The Si(4)-O(22) bond length is 1.65 Å. The Si(4)-O(24) bond length is 1.64 Å. The Si(4)-O(4) bond length is 1.63 Å. In the fifth Si site, Si(5) is bonded to one O(1), one O(15), one O(19), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-54°. The Si(5)-O(1) bond length is 1.69 Å. The Si(5)-O(15) bond length is 1.59 Å. The Si(5)-O(19) bond length is 1.68 Å. The Si(5)-O(5) bond length is 1.60 Å. In the sixth Si site, Si(6) is bonded to one O(16), one O(2), one O(20), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-57°. The Si(6)-O(16) bond length is 1.57 Å. The Si(6)-O(2) bond length is 1.67 Å. The Si(6)-O(20) bond length is 1.67 Å. The Si(6)-O(6) bond length is 1.63 Å. In the seventh Si site, Si(7) is bonded to one O(17), one O(21), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(2)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra, and corners with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-56°. The Si(7)-O(17) bond length is 1.57 Å. The Si(7)-O(21) bond length is 1.67 Å. The Si(7)-O(3) bond length is 1.67 Å. The Si(7)-O(7) bond length is 1.63 Å. In the eighth Si site, Si(8) is bonded to one O(18), one O(22), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one Mg(4)O6 octahedra,  a cornercorner with one Mg(5)O6 octahedra, and corners with two equivalent Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-54°. The Si(8)-O(18) bond length is 1.59 Å. The Si(8)-O(22) bond length is 1.68 Å. The Si(8)-O(4) bond length is 1.69 Å. The Si(8)-O(8) bond length is 1.60 Å. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(1), and one Si(5) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(2), and one Si(6) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(3), and one Si(7) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(4), and one Si(8) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Mg(1), one Mg(4), and one Si(5) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Mg(2), one Mg(5), and one Si(6) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Mg(2), one Mg(5), and one Si(7) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Mg(1), one Mg(4), and one Si(8) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Mg(1), one Mg(2), one Mg(3), and one O(10) atom. The O(9)-O(10) bond length is 1.57 Å. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Mg(1), one Mg(2), one Mg(3), and one O(9) atom. In the eleventh O site, O(11) is bonded to one Mg(1), one Mg(3), one Mg(4), and one Si(1) atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the twelfth O site, O(12) is bonded to one Mg(2), one Mg(3), one Mg(5), and one Si(2) atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the thirteenth O site, O(13) is bonded to one Mg(2), one Mg(3), one Mg(5), and one Si(3) atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the fourteenth O site, O(14) is bonded to one Mg(1), one Mg(3), one Mg(4), and one Si(4) atom to form a mixture of distorted edge and corner-sharing OMg3Si trigonal pyramids. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Ca(1), one Mg(5), and one Si(5) atom. In the sixteenth O site, O(16) is bonded in a distorted T-shaped geometry to one Na(1), one Mg(4), and one Si(6) atom. In the seventeenth O site, O(17) is bonded in a distorted T-shaped geometry to one Na(1), one Mg(4), and one Si(7) atom. In the eighteenth O site, O(18) is bonded in a distorted T-shaped geometry to one Ca(1), one Mg(5), and one Si(8) atom. In the nineteenth O site, O(19) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(1), and one Si(5) atom. In the twentieth O site, O(20) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(2), and one Si(6) atom. In the twenty-first O site, O(21) is bonded in a 2-coordinate geometry to one K(1), one Na(1), one Si(3), and one Si(7) atom. In the twenty-second O site, O(22) is bonded in a 2-coordinate geometry to one K(1), one Ca(1), one Si(4), and one Si(8) atom. In the twenty-third O site, O(23) is bonded in a 3-coordinate geometry to one K(1), one Si(1), and one Si(2) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one K(1), one Si(3), and one Si(4) atom.