Na2MgSiO4 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form NaO4 tetrahedra that share corners with four equivalent Mg(1)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MgO4 tetrahedra that share corners with four equivalent Na(2)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Na(2)O4 tetrahedra and corners with four equivalent Mg(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal pyramidal geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), and one Si(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom.
Na2MgSiO4 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. The Na(1)-O(1) bond length is 2.27 Å. The Na(1)-O(3) bond length is 2.32 Å. The Na(1)-O(4) bond length is 2.33 Å. There is one shorter (2.61 Å) and one longer (2.71 Å) Na(1)-O(2) bond length. In the second Na site, Na(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form NaO4 tetrahedra that share corners with four equivalent Mg(1)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. The Na(2)-O(1) bond length is 2.23 Å. The Na(2)-O(2) bond length is 2.25 Å. The Na(2)-O(3) bond length is 2.29 Å. The Na(2)-O(4) bond length is 2.30 Å. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MgO4 tetrahedra that share corners with four equivalent Na(2)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. The Mg(1)-O(1) bond length is 1.92 Å. The Mg(1)-O(2) bond length is 1.94 Å. The Mg(1)-O(3) bond length is 1.95 Å. The Mg(1)-O(4) bond length is 1.96 Å. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Na(2)O4 tetrahedra and corners with four equivalent Mg(1)O4 tetrahedra. The Si(1)-O(1) bond length is 1.64 Å. The Si(1)-O(2) bond length is 1.64 Å. The Si(1)-O(3) bond length is 1.63 Å. The Si(1)-O(4) bond length is 1.64 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal pyramidal geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), and one Si(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Mg(1), and one Si(1) atom.