Michael E. Fleet, 1998, Sodium Heptasilicate: A High-Pressure Silicate with Six-Membered Rings of Tetrahedra Interconnected by SiO6 Octahedra: (Na8SiSi6O18). American Mineralogist, v.83, 618-624. TABLE 3. List of observed and calculated structure factors H K L FO FC H K L FO FC H K L FO FC 1 1 1 9.2 9.5 6 3 4 6.8 7.7 -1 -6 -2 18.1 18.3 2 2 2 19.2 18.2 7 4 5 4.8 5.5 0 -5 -1 12.5 12.4 3 3 3 38.6 39.0 -3 -6 -6 7.8 7.8 1 -4 0 20.8 21.3 4 4 4 86.3 82.1 -2 -5 -5 5.3 5.4 2 -3 1 10.4 10.2 5 5 5 23.8 24.1 -1 -4 -4 6.0 5.2 3 -2 2 30.9 31.3 -5 -6 -6 7.4 7.9 0 -3 -3 18.9 18.9 4 -1 3 3.1 1.7 -4 -5 -5 2.7 4.3 1 -2 -2 10.9 10.8 5 0 4 11.9 11.7 -3 -4 -4 3.6 3.7 2 -1 -1 21.0 21.2 6 1 5 2.6 1.3 -2 -3 -3 20.6 19.9 3 0 0 35.4 33.4 7 2 6 10.9 11.7 -1 -2 -2 26.3 26.7 4 1 1 1.9 3.1 -3 -8 -5 0.0 2.7 0 -1 -1 15.3 16.4 5 2 2 13.0 14.0 -2 -7 -4 2.8 0.4 2 1 1 16.9 17.0 6 3 3 8.5 8.6 -1 -6 -3 5.6 6.5 3 2 2 8.0 7.8 7 4 4 4.8 5.6 0 -5 -2 31.2 31.6 4 3 3 12.5 12.9 -3 -7 -4 0.5 1.3 1 -4 -1 17.2 17.1 5 4 4 8.1 6.9 -2 -6 -3 3.3 2.2 2 -3 0 10.8 10.4 6 5 5 3.2 0.3 -1 -5 -2 9.5 10.2 3 -2 1 10.8 11.0 -4 -6 -5 7.0 7.9 0 -4 -1 0.0 1.1 4 -1 2 27.0 26.7 -3 -5 -4 4.5 4.6 1 -3 0 24.6 24.7 5 0 3 27.1 26.9 -2 -4 -3 13.1 13.5 2 -2 1 20.1 20.1 6 1 4 5.9 5.4 -1 -3 -2 21.9 21.4 3 -1 2 13.5 13.0 7 2 5 3.3 4.9 0 -2 -1 23.2 23.6 4 0 3 6.1 7.2 -2 -7 -5 5.0 5.1 1 -1 0 11.8 12.8 5 1 4 12.8 13.1 -1 -6 -4 5.0 5.5 2 0 1 22.8 23.6 6 2 5 6.2 5.3 0 -5 -3 26.8 26.4 3 1 2 21.7 21.0 7 3 6 4.9 3.0 1 -4 -2 26.5 26.7 4 2 3 12.8 13.1 -3 -7 -5 13.5 15.4 2 -3 -1 10.3 10.6 5 3 4 4.5 4.2 -2 -6 -4 37.4 37.2 3 -2 0 9.4 10.1 6 4 5 7.4 7.8 -1 -5 -3 36.8 36.4 4 -1 1 17.3 17.3 -4 -6 -6 17.0 18.6 0 -4 -2 6.8 6.4 5 0 2 31.4 31.7 -3 -5 -5 34.2 31.9 1 -3 -1 4.5 4.4 6 1 3 5.7 6.4 -2 -4 -4 16.0 16.3 2 -2 0 100.7 102.2 7 2 4 0.0 0.0 -1 -3 -3 31.0 31.2 3 -1 1 5.5 4.5 8 3 5 0.0 2.5 0 -2 -2 103.9 105.3 4 0 2 6.6 6.8 -2 -7 -6 11.2 12.0 1 -1 -1 24.5 26.3 5 1 3 37.6 36.8 -1 -6 -5 2.3 1.1 2 0 0 46.2 47.7 6 2 4 36.6 37.2 0 -5 -4 11.7 11.8 3 1 1 26.2 27.0 7 3 5 16.0 15.2 1 -4 -3 3.0 1.9 4 2 2 80.9 80.3 -3 -7 -6 3.5 3.1 2 -3 -2 31.9 31.5 5 3 3 17.5 16.9 -2 -6 -5 5.4 5.3 3 -2 -1 10.4 10.2 6 4 4 3.3 0.5 -1 -5 -4 13.4 13.2 4 -1 0 22.4 22.2 7 5 5 20.4 24.0 0 -4 -3 6.4 7.6 5 0 1 12.4 12.2 -4 -7 -5 4.3 5.5 1 -3 -2 14.0 13.3 6 1 2 18.3 18.5 -3 -6 -4 6.2 7.6 2 -2 -1 20.3 20.1 7 2 3 10.7 10.6 -2 -5 -3 10.0 10.0 3 -1 0 25.3 24.6 8 3 4 2.7 2.8 -1 -4 -2 22.2 21.8 4 0 1 0.0 0.5 -1 -6 -6 9.4 10.6 0 -3 -1 6.9 7.1 5 1 2 10.1 10.3 0 -5 -5 7.9 8.0 1 -2 0 39.7 39.8 6 2 3 3.1 1.8 1 -4 -4 0.8 1.1 2 -1 1 11.7 11.7 7 3 4 0.0 1.3 2 -3 -3 10.8 10.7 3 0 2 31.6 30.5 -2 -6 -6 18.0 17.3 3 -2 -2 37.8 37.2 4 1 3 1.4 0.9 -1 -5 -5 33.5 32.2 4 -1 -1 6.8 6.8 5 2 4 17.4 17.2 0 -4 -4 86.2 84.0 5 0 0 0.0 0.6 6 3 5 2.9 2.3 1 -3 -3 36.0 36.4 6 1 1 17.3 17.8 -3 -6 -5 1.3 2.4 2 -2 -2 46.0 45.1 7 2 2 18.4 18.7 -2 -5 -4 16.7 17.3 3 -1 -1 23.5 22.2 8 3 3 6.5 6.6 -1 -4 -3 0.0 0.8 4 0 0 127.3 124.3 -2 -8 -3 0.7 2.5 0 -3 -2 30.7 30.5 5 1 1 8.5 8.7 -1 -7 -2 5.2 5.4 1 -2 -1 11.9 11.8 6 2 2 18.4 19.3 0 -6 -1 0.0 2.2 2 -1 0 39.4 39.8 7 3 3 15.4 15.1 1 -5 0 20.6 20.9 3 0 1 7.1 7.1 8 4 4 24.9 25.4 2 -4 1 10.2 10.0 4 1 2 21.8 21.2 -3 -8 -4 0.0 2.0 3 -3 2 17.2 16.9 5 2 3 10.6 10.1 -2 -7 -3 10.2 10.5 4 -2 3 9.9 9.2 H K L FO FC H K L FO FC H K L FO FC 5 -1 4 7.5 8.2 5 -2 4 23.6 23.8 -1 -9 -2 0.0 2.1 6 0 5 9.3 9.1 6 -1 5 3.6 0.6 0 -8 -1 3.3 0.8 7 1 6 0.0 1.8 7 0 6 0.0 0.5 1 -7 0 6.8 7.3 -2 -8 -4 3.1 4.2 -1 -8 -3 4.1 4.8 2 -6 1 2.5 0.4 -1 -7 -3 16.9 16.2 0 -7 -2 5.6 5.0 3 -5 2 2.8 2.9 0 -6 -2 52.4 52.4 1 -6 -1 12.4 12.4 4 -4 3 1.7 1.3 1 -5 -1 17.8 18.1 2 -5 0 30.7 30.7 5 -3 4 0.5 3.6 2 -4 0 22.0 22.2 3 -4 1 7.3 6.9 6 -2 5 4.7 3.0 3 -3 1 20.2 19.7 4 -3 2 8.6 8.3 7 -1 6 1.0 3.3 4 -2 2 78.9 80.1 5 -2 3 4.0 1.9 0 -8 -2 2.0 0.7 5 -1 3 13.5 13.8 6 -1 4 16.5 16.8 1 -7 -1 6.9 5.5 6 0 4 1.8 3.1 7 0 5 10.6 10.8 2 -6 0 61.9 62.1 7 1 5 32.3 29.7 -1 -8 -4 7.3 8.9 3 -5 1 25.1 25.2 -2 -8 -5 5.9 7.3 0 -7 -3 21.0 20.8 4 -4 2 6.7 6.4 -1 -7 -4 7.2 7.4 1 -6 -2 19.9 20.5 5 -3 3 23.7 22.7 0 -6 -3 17.4 17.2 2 -5 -1 7.7 7.8 6 -2 4 47.7 47.4 1 -5 -2 4.5 4.8 3 -4 0 19.9 20.3 7 -1 5 2.9 3.4 2 -4 -1 26.3 26.0 4 -3 1 8.7 9.9 0 -8 -3 3.4 4.3 3 -3 0 25.5 25.7 5 -2 2 31.4 31.2 1 -7 -2 1.1 2.1 4 -2 1 26.4 26.1 6 -1 3 0.0 0.1 2 -6 -1 3.7 3.0 5 -1 2 4.4 5.0 7 0 4 10.1 10.5 3 -5 0 0.0 0.3 6 0 3 16.9 17.0 8 1 5 4.9 2.4 4 -4 1 4.3 4.7 7 1 4 7.6 7.8 -1 -8 -5 4.9 2.4 5 -3 2 5.6 5.4 8 2 5 4.5 7.5 0 -7 -4 10.2 10.7 6 -2 3 6.8 7.3 -1 -7 -5 29.6 29.9 1 -6 -3 0.0 0.4 7 -1 4 2.3 0.4 0 -6 -4 3.2 3.3 2 -5 -2 31.8 31.4 8 0 5 4.5 3.0 1 -5 -3 12.8 13.4 3 -4 -1 9.6 9.7 0 -8 -4 41.1 40.7 2 -4 -2 79.4 79.9 4 -3 0 20.8 20.4 1 -7 -3 14.2 14.4 3 -3 -1 20.1 20.0 5 -2 1 9.2 8.5 2 -6 -2 6.5 6.0 4 -2 0 22.7 22.6 6 -1 2 20.4 20.8 3 -5 -1 13.8 14.4 5 -1 1 17.5 17.7 7 0 3 21.0 20.7 4 -4 0 98.6 96.1 6 0 2 53.2 52.7 8 1 4 7.4 9.0 5 -3 1 14.4 14.4 7 1 3 17.2 16.0 0 -7 -5 10.1 10.7 6 -2 2 5.7 5.8 8 2 4 3.9 4.3 1 -6 -4 17.4 16.8 7 -1 3 14.1 14.4 -1 -7 -6 3.2 2.4 2 -5 -3 1.9 1.9 8 0 4 40.2 40.9 0 -6 -5 9.8 9.0 3 -4 -2 8.3 8.1 0 -8 -5 0.0 3.2 1 -5 -4 7.9 8.4 4 -3 -1 7.1 7.0 1 -7 -4 0.0 0.4 2 -4 -3 10.1 9.8 5 -2 0 30.9 30.4 2 -6 -3 7.0 7.6 3 -3 -2 17.0 16.9 6 -1 1 12.4 12.8 3 -5 -2 5.1 5.5 4 -2 -1 9.3 9.8 7 0 2 4.6 4.5 4 -4 -1 4.2 5.3 5 -1 0 20.0 20.5 8 1 3 4.8 4.5 5 -3 0 2.2 0.2 6 0 1 3.8 2.8 0 -7 -6 0.0 0.0 6 -2 1 2.2 3.1 7 1 2 4.6 4.4 1 -6 -5 0.0 0.0 7 -1 2 2.4 1.7 8 2 3 3.2 2.0 2 -5 -4 24.3 23.7 8 0 3 5.1 5.1 0 -6 -6 21.2 21.6 3 -4 -3 4.0 4.1 1 -7 -5 3.8 3.6 1 -5 -5 17.8 17.3 4 -3 -2 2.4 0.5 2 -6 -4 46.9 48.0 2 -4 -4 14.3 14.1 5 -2 -1 9.1 9.4 3 -5 -3 23.0 22.4 3 -3 -3 8.4 8.4 6 -1 0 28.4 28.6 4 -4 -2 5.8 6.2 4 -2 -2 63.3 64.5 7 0 1 5.1 3.9 5 -3 -1 25.4 25.0 5 -1 -1 3.0 5.3 8 1 2 0.0 0.5 6 -2 0 63.7 61.9 6 0 0 4.8 4.0 1 -6 -6 9.1 9.3 7 -1 1 3.9 4.9 7 1 1 27.4 25.8 2 -5 -5 0.0 0.7 8 0 2 2.0 0.8 8 2 2 30.5 30.1 3 -4 -4 12.3 11.4 1 -7 -6 0.5 3.5 -1 -8 -2 4.2 0.9 4 -3 -3 2.2 2.1 2 -6 -5 4.0 3.4 0 -7 -1 4.7 4.0 5 -2 -2 30.7 30.3 3 -5 -4 3.7 3.5 1 -6 0 27.8 28.4 6 -1 -1 9.6 10.9 4 -4 -3 0.0 1.8 2 -5 1 9.6 9.6 7 0 0 9.4 9.9 5 -3 -2 2.1 3.0 3 -4 2 0.0 0.2 8 1 1 9.8 10.6 6 -2 -1 1.4 0.6 4 -3 3 3.9 4.0 9 2 2 9.6 13.1 7 -1 0 8.0 7.9 H K L FO FC H K L FO FC H K L FO FC 8 0 1 0.0 0.5 2 -7 -5 7.8 7.6 4 -6 -2 39.9 39.4 9 1 2 3.4 1.9 3 -6 -4 6.3 7.0 5 -5 -1 6.7 6.4 2 -6 -6 8.4 8.4 4 -5 -3 21.5 21.3 6 -4 0 8.9 9.2 3 -5 -5 5.5 5.2 5 -4 -2 20.4 20.5 7 -3 1 10.1 10.0 4 -4 -4 53.8 53.4 6 -3 -1 4.2 4.7 8 -2 2 30.7 32.7 5 -3 -3 15.2 15.3 7 -2 0 7.9 8.2 3 -7 -4 7.6 8.0 6 -2 -2 7.8 7.8 8 -1 1 0.0 3.6 4 -6 -3 8.3 9.0 7 -1 -1 12.8 13.1 9 0 2 15.4 16.2 5 -5 -2 0.0 2.3 8 0 0 30.7 35.4 2 -7 -6 4.8 4.5 6 -4 -1 9.9 9.1 9 1 1 25.3 24.2 3 -6 -5 6.3 6.8 7 -3 0 7.8 8.2 0 -9 -1 0.0 1.5 4 -5 -4 3.2 5.0 8 -2 1 4.9 4.1 1 -8 0 5.6 3.5 5 -4 -3 13.5 12.9 9 -1 2 4.9 4.9 2 -7 1 3.9 4.6 6 -3 -2 13.9 14.1 3 -7 -5 12.9 14.1 3 -6 2 14.9 14.4 7 -2 -1 4.0 4.4 4 -6 -4 0.0 0.7 4 -5 3 13.3 12.7 8 -1 0 5.1 4.2 5 -5 -3 3.0 4.0 5 -4 4 5.2 4.7 9 0 1 4.7 1.1 6 -4 -2 36.9 37.6 6 -3 5 7.9 7.1 3 -6 -6 21.2 22.6 7 -3 -1 4.5 0.6 7 -2 6 0.0 4.1 4 -5 -5 19.1 19.5 8 -2 0 3.0 0.1 0 -9 -2 13.5 16.5 5 -4 -4 9.5 8.8 9 -1 1 17.9 16.6 1 -8 -1 6.3 4.2 6 -3 -3 3.1 4.3 4 -6 -5 11.7 12.5 2 -7 0 8.6 8.8 7 -2 -2 42.3 38.7 5 -5 -4 4.7 0.6 3 -6 1 3.9 4.5 8 -1 -1 3.4 5.2 6 -4 -3 2.3 1.4 4 -5 2 20.3 20.6 9 0 0 7.8 9.0 7 -3 -2 6.9 6.2 5 -4 3 22.2 21.4 1 -9 0 2.3 6.8 8 -2 -1 13.9 13.8 6 -3 4 7.3 7.4 2 -8 1 12.2 13.7 9 -1 0 5.4 6.2 7 -2 5 7.5 7.5 3 -7 2 3.5 6.5 4 -6 -6 21.2 23.3 1 -8 -2 7.3 8.6 4 -6 3 2.9 1.8 5 -5 -5 0.0 4.0 2 -7 -1 6.8 7.0 5 -5 4 0.7 0.3 6 -4 -4 5.2 5.6 3 -6 0 11.0 10.5 6 -4 5 12.0 12.6 7 -3 -3 7.3 8.2 4 -5 1 9.6 9.1 1 -9 -1 17.1 16.7 8 -2 -2 32.4 31.7 5 -4 2 22.0 20.5 2 -8 0 4.2 0.7 9 -1 -1 8.2 8.7 6 -3 3 12.9 12.9 3 -7 1 1.2 0.4 3 -8 2 5.7 5.3 7 -2 4 0.0 0.5 4 -6 2 39.0 38.0 4 -7 3 5.9 5.4 8 -1 5 6.2 4.7 5 -5 3 3.9 3.8 5 -6 4 9.8 10.3 1 -8 -3 3.1 0.9 6 -4 4 0.8 0.5 6 -5 5 5.3 6.0 2 -7 -2 19.2 18.7 7 -3 5 13.8 13.7 2 -9 0 17.5 19.2 3 -6 -1 1.9 2.0 1 -9 -2 0.0 4.9 3 -8 1 7.7 8.5 4 -5 0 2.5 2.0 2 -8 -1 5.3 3.2 4 -7 2 15.3 15.2 5 -4 1 13.6 14.4 3 -7 0 7.9 7.7 5 -6 3 3.7 4.4 6 -3 2 19.5 19.1 4 -6 1 9.7 9.6 6 -5 4 18.3 18.8 7 -2 3 10.6 10.8 5 -5 2 3.2 2.8 7 -4 5 14.0 15.0 8 -1 4 5.2 5.4 6 -4 3 8.3 8.4 2 -9 -1 6.5 6.2 1 -8 -4 6.3 6.0 7 -3 4 7.7 8.1 3 -8 0 13.1 12.6 2 -7 -3 10.1 10.3 2 -8 -2 34.6 32.8 4 -7 1 5.3 4.4 3 -6 -2 19.9 19.1 3 -7 -1 9.5 10.2 5 -6 2 8.2 8.4 4 -5 -1 14.7 14.3 4 -6 0 9.2 9.3 6 -5 3 15.0 15.8 5 -4 0 2.6 2.3 5 -5 1 6.4 7.0 7 -4 4 11.3 10.5 6 -3 1 0.7 1.6 6 -4 2 39.0 39.5 3 -8 -1 7.2 6.2 7 -2 2 18.5 18.6 7 -3 3 8.4 10.2 4 -7 0 9.9 9.1 8 -1 3 1.9 0.9 8 -2 4 4.1 5.2 5 -6 1 3.1 2.0 1 -8 -5 1.5 4.7 2 -8 -3 8.0 10.0 6 -5 2 10.9 11.4 2 -7 -4 0.0 0.6 3 -7 -2 10.7 10.4 7 -4 3 16.9 17.4 3 -6 -3 12.2 12.6 4 -6 -1 6.7 6.7 8 -3 4 5.7 2.2 4 -5 -2 20.8 20.3 5 -5 0 3.9 3.8 3 -8 -2 1.5 2.8 5 -4 -1 8.7 9.6 6 -4 1 8.2 7.4 4 -7 -1 9.1 9.5 6 -3 0 10.2 11.1 7 -3 2 10.3 10.2 5 -6 0 15.9 15.7 7 -2 1 7.0 7.0 8 -2 3 8.0 9.3 6 -5 1 1.5 1.7 8 -1 2 5.4 9.0 2 -8 -4 3.9 5.2 7 -4 2 6.6 7.1 9 0 3 13.0 13.3 3 -7 -3 8.5 10.0 8 -3 3 0.0 1.6 H K L FO FC H K L FO FC H K L FO FC 3 -8 -3 0.0 1.3 9 -2 0 20.3 19.4 5 -7 -1 8.9 8.6 4 -7 -2 6.4 7.5 5 -6 -5 6.0 5.6 6 -6 0 31.6 32.3 5 -6 -1 0.0 1.6 6 -5 -4 10.6 10.2 7 -5 1 8.0 8.6 6 -5 0 15.7 15.8 7 -4 -3 4.9 5.2 8 -4 2 4.4 4.3 7 -4 1 8.6 9.6 8 -3 -2 6.2 5.7 4 -8 -3 0.0 0.5 8 -3 2 4.7 3.3 9 -2 -1 0.0 0.5 5 -7 -2 12.9 13.8 3 -8 -4 3.9 2.2 6 -5 -5 8.5 8.6 6 -6 -1 1.5 0.5 4 -7 -3 17.7 17.9 7 -4 -4 15.1 15.4 7 -5 0 11.0 10.2 5 -6 -2 11.1 11.2 8 -3 -3 8.1 9.5 8 -4 1 4.9 4.3 6 -5 -1 1.5 1.7 4 -8 2 0.0 0.7 5 -7 -3 5.9 6.9 7 -4 0 9.1 9.2 5 -7 3 9.3 9.5 6 -6 -2 2.6 4.8 8 -3 1 5.8 6.2 4 -8 1 4.8 7.9 7 -5 -1 6.8 7.7 9 -2 2 12.0 8.4 5 -7 2 0.0 1.5 8 -4 0 26.7 26.2 4 -7 -4 9.8 10.7 6 -6 3 6.9 7.0 6 -6 -3 7.5 6.7 5 -6 -3 15.4 15.5 4 -8 0 22.6 26.1 7 -5 -2 3.3 1.6 6 -5 -2 9.1 9.1 5 -7 1 7.5 7.7 8 -4 -1 8.1 7.0 7 -4 -1 3.4 4.1 6 -6 2 4.6 4.8 7 -5 -3 7.6 9.2 8 -3 0 12.9 13.2 7 -5 3 6.2 6.9 8 -4 -2 3.9 0.5 9 -2 1 6.3 5.6 4 -8 -1 5.2 4.9 6 -7 1 1.8 4.6 4 -7 -5 12.3 14.9 5 -7 0 10.0 10.3 6 -7 0 11.1 9.9 5 -6 -4 19.4 18.7 6 -6 1 0.0 0.2 7 -6 1 3.6 2.0 6 -5 -3 4.2 4.2 7 -5 2 12.3 13.7 6 -7 -1 2.5 2.1 7 -4 -2 14.5 15.4 8 -4 3 0.0 0.7 7 -6 0 10.9 9.6 8 -3 -1 8.8 8.3 4 -8 -2 4.4 4.6 7 -6 -1 4.3 4.9