Na2CaSiO4 crystallizes in the cubic P2_13 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted trigonal planar geometry to six equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to three equivalent O(2) atoms. Ca(1) is bonded in a 7-coordinate geometry to one O(1) and six equivalent O(2) atoms. Si(1) is bonded in a tetrahedral geometry to one O(1) and three equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Ca(1) and one Si(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Na(2), two equivalent Na(1), two equivalent Ca(1), and one Si(1) atom.
Na2CaSiO4 crystallizes in the cubic P2_13 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted trigonal planar geometry to six equivalent O(2) atoms. There are three shorter (2.40 Å) and three longer (2.89 Å) Na(1)-O(2) bond lengths. In the second Na site, Na(2) is bonded in a 3-coordinate geometry to three equivalent O(2) atoms. All Na(2)-O(2) bond lengths are 2.31 Å. Ca(1) is bonded in a 7-coordinate geometry to one O(1) and six equivalent O(2) atoms. The Ca(1)-O(1) bond length is 2.24 Å. There are three shorter (2.47 Å) and three longer (2.63 Å) Ca(1)-O(2) bond lengths. Si(1) is bonded in a tetrahedral geometry to one O(1) and three equivalent O(2) atoms. The Si(1)-O(1) bond length is 1.62 Å. All Si(1)-O(2) bond lengths are 1.66 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Ca(1) and one Si(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Na(2), two equivalent Na(1), two equivalent Ca(1), and one Si(1) atom.