NaMg6Al3Si6(BO10)3 crystallizes in the trigonal R3 space group. Na(1) is bonded in a 3-coordinate geometry to three equivalent O(6) atoms. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(5), two equivalent O(1), and two equivalent O(10) atoms to form distorted MgO5 square pyramids that share  a cornercorner with one Al(1)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra, edges with two equivalent Mg(1)O5 square pyramids, and  an edgeedge with one Al(1)O4 tetrahedra. In the second Mg site, Mg(2) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(2), and two equivalent O(9) atoms. Al(1) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Mg(1)O5 square pyramid,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent B(1)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. B(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form BO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with two equivalent Al(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(2) is bonded to one O(10), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share corners with three equivalent Mg(1)O5 square pyramids,  a cornercorner with one Al(1)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the second Si site, Si(1) is bonded to one O(3), one O(4), one O(8), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one B(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are ten inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to one Mg(2), one B(1), and one Si(1) atom. In the second O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Al(1), and one Si(2) atom. In the third O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(1), and one B(1) atom. In the fourth O site, O(7) is bonded in a bent 120 degrees geometry to one Al(1) and one B(1) atom. In the fifth O site, O(8) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(9) is bonded in a distorted T-shaped geometry to two equivalent Mg(2) and one Si(1) atom. In the seventh O site, O(10) is bonded in a distorted T-shaped geometry to two equivalent Mg(1) and one Si(2) atom. In the eighth O site, O(1) is bonded in a T-shaped geometry to two equivalent Mg(1) and one Al(1) atom. In the ninth O site, O(2) is bonded in a T-shaped geometry to two equivalent Mg(2) and one B(1) atom. In the tenth O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom.
NaMg6Al3Si6(BO10)3 crystallizes in the trigonal R3 space group. Na(1) is bonded in a 3-coordinate geometry to three equivalent O(6) atoms. All Na(1)-O(6) bond lengths are 2.42 Å. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(5), two equivalent O(1), and two equivalent O(10) atoms to form distorted MgO5 square pyramids that share  a cornercorner with one Al(1)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra, edges with two equivalent Mg(1)O5 square pyramids, and  an edgeedge with one Al(1)O4 tetrahedra. The Mg(1)-O(5) bond length is 2.32 Å. There is one shorter (1.92 Å) and one longer (2.04 Å) Mg(1)-O(1) bond length. There is one shorter (1.98 Å) and one longer (2.02 Å) Mg(1)-O(10) bond length. In the second Mg site, Mg(2) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(2), and two equivalent O(9) atoms. The Mg(2)-O(4) bond length is 2.31 Å. There is one shorter (2.00 Å) and one longer (2.11 Å) Mg(2)-O(2) bond length. There is one shorter (2.02 Å) and one longer (2.04 Å) Mg(2)-O(9) bond length. Al(1) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Mg(1)O5 square pyramid,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent B(1)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The Al(1)-O(1) bond length is 1.73 Å. The Al(1)-O(5) bond length is 1.77 Å. The Al(1)-O(6) bond length is 1.73 Å. The Al(1)-O(7) bond length is 1.80 Å. B(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form BO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with two equivalent Al(1)O4 tetrahedra. The B(1)-O(2) bond length is 1.47 Å. The B(1)-O(4) bond length is 1.56 Å. The B(1)-O(6) bond length is 1.43 Å. The B(1)-O(7) bond length is 1.46 Å. There are two inequivalent Si sites. In the first Si site, Si(2) is bonded to one O(10), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share corners with three equivalent Mg(1)O5 square pyramids,  a cornercorner with one Al(1)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The Si(2)-O(10) bond length is 1.61 Å. The Si(2)-O(3) bond length is 1.64 Å. The Si(2)-O(5) bond length is 1.64 Å. The Si(2)-O(8) bond length is 1.64 Å. In the second Si site, Si(1) is bonded to one O(3), one O(4), one O(8), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one B(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. The Si(1)-O(3) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.67 Å. The Si(1)-O(8) bond length is 1.64 Å. The Si(1)-O(9) bond length is 1.62 Å. There are ten inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to one Mg(2), one B(1), and one Si(1) atom. In the second O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Al(1), and one Si(2) atom. In the third O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(1), one Al(1), and one B(1) atom. In the fourth O site, O(7) is bonded in a bent 120 degrees geometry to one Al(1) and one B(1) atom. In the fifth O site, O(8) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(9) is bonded in a distorted T-shaped geometry to two equivalent Mg(2) and one Si(1) atom. In the seventh O site, O(10) is bonded in a distorted T-shaped geometry to two equivalent Mg(1) and one Si(2) atom. In the eighth O site, O(1) is bonded in a T-shaped geometry to two equivalent Mg(1) and one Al(1) atom. In the ninth O site, O(2) is bonded in a T-shaped geometry to two equivalent Mg(2) and one B(1) atom. In the tenth O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom.