Nepheline Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from single crystal data of 060581 Buerger M J, Klein G E, Hamburger G E American Mineralogist 32 (1947) 197-197 The structure of nepheline CELL PARAMETERS: 10.0600 10.0600 8.4260 90.000 90.000 120.000 SPACE GROUP: P6_3 ATOM X Y Z OCCUPANCY ISO(B) K 0.00000 0.00000 0.00000 1.000 1.500 Na 0.01000 0.43000 0.00000 1.000 1.500 Si 0.33333 0.66667 0.82000 1.000 0.500 Al 0.33333 0.66667 0.18000 1.000 0.600 Si 0.09000 0.33000 0.33333 1.000 0.500 Al 0.09000 0.33000 0.66667 1.000 0.600 O 0.33333 0.66667 0.00000 1.000 1.000 O 0.09000 0.33000 0.50000 1.000 1.000 O 0.17000 0.52000 0.75000 1.000 1.000 O 0.17000 0.52000 0.25000 1.000 1.000 O 0.25000 0.28000 0.25000 1.000 1.000 O 0.25000 0.28000 0.75000 1.000 1.000 X-RAY WAVELENGTH: 1.541838 BOUNDS ON TWO THETA: 5.0 90.0 LIMITS IMPOSED ON THE INDICES ARE: +/- 7 +/- 7 +/- 7 MAX. ABS. INTENSITY / VOLUME**2: 8.910891199 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 14.63 1.63 6.0567 1 0 1 17.63 1.90 5.0300 1 1 0 20.39 15.90 4.3561 2 0 0 20.56 13.58 4.3190 1 1 1 21.09 32.42 4.2130 0 0 2 22.98 100.00 3.8696 2 0 1 23.46 8.97 3.7928 1 0 2 27.08 23.29 3.2929 1 2 0 27.08 37.93 3.2929 2 1 0 27.62 1.81 3.2298 1 1 2 29.12 20.84 3.0670 1 2 1 29.12 10.51 3.0670 2 1 1 29.50 71.22 3.0284 2 0 2 30.79 57.09 2.9041 3 0 0 34.57 18.12 2.5944 2 1 2 35.70 15.23 2.5150 2 2 0 36.65 21.89 2.4523 1 1 3 37.21 21.03 2.4163 1 3 0 38.12 19.45 2.3605 2 0 3 38.77 14.05 2.3227 1 3 1 38.77 22.36 2.3227 3 1 1 41.46 3.09 2.1781 4 0 0 41.83 11.09 2.1595 2 2 2 42.89 3.90 2.1087 4 0 1 42.93 12.96 2.1065 0 0 4 43.16 13.62 2.0961 3 1 2 45.38 3.69 1.9987 3 2 0 46.71 8.63 1.9448 2 3 1 46.71 3.38 1.9448 3 2 1 47.84 2.37 1.9012 1 4 0 47.84 1.63 1.9012 4 1 0 47.97 4.32 1.8964 2 0 4 48.59 1.37 1.8736 2 2 3 50.54 1.58 1.8058 2 3 2 50.54 14.01 1.8058 3 2 2 53.22 1.11 1.7212 4 0 3 53.72 7.74 1.7063 5 0 1 53.76 1.70 1.7052 3 0 4 55.84 1.63 1.6465 4 2 0 55.84 3.19 1.6465 2 4 0 55.91 1.06 1.6444 3 3 1 56.51 2.32 1.6285 2 3 3 56.51 3.05 1.6285 3 2 3 56.99 1.63 1.6159 4 2 1 56.99 1.75 1.6159 2 4 1 57.21 7.33 1.6102 5 0 2 58.09 1.25 1.5878 1 3 4 58.09 10.20 1.5878 3 1 4 58.64 1.96 1.5744 1 4 3 58.64 3.17 1.5744 4 1 3 58.75 6.75 1.5717 2 0 5 59.03 4.06 1.5648 1 5 0 60.15 2.39 1.5385 1 5 1 60.36 1.99 1.5335 2 4 2 61.21 3.34 1.5142 4 0 4 61.85 2.64 1.5002 1 2 5 62.75 5.51 1.4807 5 0 3 63.41 2.74 1.4669 1 5 2 64.24 1.14 1.4499 2 3 4 64.75 6.38 1.4397 3 3 3 66.59 2.11 1.4043 0 0 6 67.09 16.05 1.3951 2 5 0 67.09 10.99 1.3951 5 2 0 67.80 2.67 1.3822 1 3 5 67.80 2.01 1.3822 3 1 5 70.08 1.80 1.3426 5 0 4 70.68 1.16 1.3328 4 0 5 73.28 1.23 1.2918 1 2 6 73.51 1.18 1.2884 3 2 5 73.51 2.37 1.2884 2 3 5 74.95 1.17 1.2671 1 6 2 75.15 3.79 1.2643 3 0 6 77.53 2.94 1.2312 7 0 1 77.91 7.67 1.2261 2 2 6 78.83 7.79 1.2142 3 1 6 78.83 4.95 1.2142 1 3 6 79.05 2.66 1.2113 5 0 5 80.46 2.23 1.1936 7 0 2 81.22 1.59 1.1844 3 4 4 84.40 1.07 1.1477 4 4 3 85.30 3.14 1.1379 7 0 3 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.