Na8Si[Si6O18] Fleet M E American Mineralogist 83 (1998) 618-624 Sodium heptasilicate: A high-pressure silicate with six-membered rings of tetrahedra interconnected by SiO6 octahedra: (Na8Si[Si6O18]) _database_code_amcsd 0002009 CELL PARAMETERS: 7.1800 7.1800 7.1800 87.260 87.260 87.260 SPACE GROUP: R-3 X-RAY WAVELENGTH: 1.541838 Cell Volume: 368.916 Density (g/cm3): 3.009 MAX. ABS. INTENSITY / VOLUME**2: 9.770947947 RIR: 1.057 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 12.35 15.34 7.1643 1 0 0 6 17.10 10.02 5.1856 1 1 0 6 17.90 6.46 4.9542 0 -1 1 6 21.81 16.32 4.0748 1 -1 1 6 24.86 42.05 3.5822 2 0 0 6 27.32 8.83 3.2641 2 0 1 6 27.32 8.86 3.2641 2 1 0 6 28.36 22.50 3.1471 0 -1 2 6 28.36 22.54 3.1471 -1 0 2 6 29.35 3.85 3.0428 2 1 1 6 30.80 1.55 2.9028 1 -1 2 6 30.80 1.52 2.9028 2 -1 1 6 31.27 5.12 2.8603 1 -2 1 6 34.59 100.00 2.5928 2 2 0 6 36.05 5.56 2.4913 2 2 1 6 36.27 85.29 2.4771 0 -2 2 6 37.67 8.16 2.3881 3 0 0 6 38.45 2.71 2.3411 1 -2 2 6 38.45 2.74 2.3411 2 -2 1 6 40.35 4.20 2.2352 0 -1 3 6 40.35 4.19 2.2352 -1 0 3 6 40.53 4.76 2.2257 3 1 1 6 42.72 2.67 2.1167 -1 -1 3 6 44.47 10.53 2.0374 2 -2 2 6 44.63 4.69 2.0302 3 0 2 6 44.63 4.69 2.0302 3 2 0 6 45.65 2.30 1.9873 3 1 2 6 45.65 2.34 1.9873 3 2 1 6 50.99 58.18 1.7911 4 0 0 6 52.97 1.20 1.7285 3 3 0 6 53.28 3.37 1.7192 2 -2 3 6 53.28 1.56 1.7192 0 -1 4 6 53.28 3.33 1.7192 3 -2 2 6 53.28 1.63 1.7192 -1 0 4 6 53.72 3.31 1.7062 3 3 1 6 53.88 4.72 1.7015 2 -3 2 6 55.50 4.12 1.6556 3 -1 3 6 55.66 1.90 1.6514 0 -3 3 6 57.09 1.41 1.6132 4 1 2 6 57.09 1.45 1.6132 4 2 1 6 57.25 1.12 1.6092 1 -3 3 6 57.25 1.10 1.6092 3 -3 1 6 57.66 1.13 1.5986 3 3 2 6 58.67 1.37 1.5735 0 -2 4 6 58.67 1.38 1.5735 -2 0 4 6 58.81 2.07 1.5702 2 -1 4 6 58.81 2.11 1.5702 4 -1 2 6 59.93 1.82 1.5434 1 -2 4 6 59.93 1.88 1.5434 4 -2 1 6 60.89 16.06 1.5214 4 2 2 6 64.17 14.13 1.4514 2 -2 4 6 64.17 14.14 1.4514 4 -2 2 6 64.42 1.05 1.4463 3 3 3 2 65.24 8.87 1.4302 2 -4 2 6 69.54 1.85 1.3518 5 0 2 6 69.54 1.85 1.3518 5 2 0 6 72.10 1.58 1.3099 0 -2 5 6 72.10 1.57 1.3099 -2 0 5 6 72.98 12.20 1.2964 4 4 0 6 75.86 1.18 1.2542 5 3 0 6 75.86 1.21 1.2542 5 0 3 6 76.23 2.16 1.2490 5 1 3 6 76.23 2.14 1.2490 5 3 1 6 76.86 1.53 1.2403 5 -2 2 6 76.86 1.54 1.2403 2 -2 5 6 76.99 14.42 1.2385 0 -4 4 6 78.35 1.43 1.2204 -2 -2 5 6 82.50 1.18 1.1692 0 -1 6 6 82.50 1.20 1.1692 -1 0 6 6 84.32 3.85 1.1486 6 2 0 6 84.32 3.86 1.1486 6 0 2 6 87.23 5.10 1.1176 -2 0 6 6 87.23 5.09 1.1176 0 -2 6 6 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.