Na3WO4 is Enargite structured and crystallizes in the orthorhombic Pmn2_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form NaO4 tetrahedra that share corners with four equivalent W(1)O4 tetrahedra and corners with eight equivalent Na(2)O4 tetrahedra. In the second Na site, Na(2) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form NaO4 tetrahedra that share corners with four equivalent Na(1)O4 tetrahedra, corners with four equivalent Na(2)O4 tetrahedra, and corners with four equivalent W(1)O4 tetrahedra. W(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form WO4 tetrahedra that share corners with four equivalent Na(1)O4 tetrahedra and corners with eight equivalent Na(2)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), two equivalent Na(2), and one W(1) atom to form corner-sharing ONa3W tetrahedra. In the second O site, O(2) is bonded to one Na(1), two equivalent Na(2), and one W(1) atom to form corner-sharing ONa3W tetrahedra. In the third O site, O(3) is bonded to one Na(1), two equivalent Na(2), and one W(1) atom to form corner-sharing ONa3W tetrahedra.
Na3WO4 is Enargite structured and crystallizes in the orthorhombic Pmn2_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form NaO4 tetrahedra that share corners with four equivalent W(1)O4 tetrahedra and corners with eight equivalent Na(2)O4 tetrahedra. The Na(1)-O(1) bond length is 2.36 Å. The Na(1)-O(2) bond length is 2.29 Å. Both Na(1)-O(3) bond lengths are 2.34 Å. In the second Na site, Na(2) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form NaO4 tetrahedra that share corners with four equivalent Na(1)O4 tetrahedra, corners with four equivalent Na(2)O4 tetrahedra, and corners with four equivalent W(1)O4 tetrahedra. The Na(2)-O(1) bond length is 2.27 Å. The Na(2)-O(2) bond length is 2.36 Å. There is one shorter (2.34 Å) and one longer (2.40 Å) Na(2)-O(3) bond length. W(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form WO4 tetrahedra that share corners with four equivalent Na(1)O4 tetrahedra and corners with eight equivalent Na(2)O4 tetrahedra. The W(1)-O(1) bond length is 1.89 Å. The W(1)-O(2) bond length is 1.89 Å. Both W(1)-O(3) bond lengths are 1.89 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), two equivalent Na(2), and one W(1) atom to form corner-sharing ONa3W tetrahedra. In the second O site, O(2) is bonded to one Na(1), two equivalent Na(2), and one W(1) atom to form corner-sharing ONa3W tetrahedra. In the third O site, O(3) is bonded to one Na(1), two equivalent Na(2), and one W(1) atom to form corner-sharing ONa3W tetrahedra.