Topaz Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern for R060026 Northrup P A, Leinenweber K, Parise J B American Mineralogist 79 (1994) 401-404 The location of H in the high-pressure synthetic Al2SiO4(OH)2 topaz analogue Sample fluor-topaz from a Mexican rhyolite CELL PARAMETERS: 4.652000 8.801000 8.404000 90.00000 90.00000 90.00000 SPACE GROUP: Pbnm X-RAY WAVELENGTH: 1.541838 2-THETA INTENSITY D-SPACING H K L 20.11 3.97 4.4174 0 2 0 21.20 1.95 4.1938 0 0 2 21.56 8.83 4.1238 1 1 0 22.76 4.70 3.9085 0 2 1 24.06 74.81 3.7007 1 1 1 27.83 86.00 3.2069 1 2 0 29.37 39.61 3.0414 0 2 2 29.83 20.63 2.9954 1 2 1 30.40 100.00 2.9404 1 1 2 36.07 23.22 2.4899 1 3 0 37.51 8.23 2.3979 1 0 3 37.68 17.27 2.3870 1 3 1 38.09 49.10 2.3624 0 2 3 38.91 8.01 2.3141 1 1 3 39.99 3.41 2.2543 2 1 0 40.85 9.67 2.2087 0 4 0 41.47 13.25 2.1770 2 1 1 42.31 4.53 2.1359 0 4 1 42.91 55.18 2.1074 1 2 3 43.13 1.38 2.0969 0 0 4 43.90 29.23 2.0619 2 2 0 45.43 7.30 1.9961 1 4 0 45.68 2.11 1.9856 2 1 2 46.46 1.54 1.9543 0 4 2 46.77 4.58 1.9419 1 4 1 48.70 24.63 1.8691 1 1 4 48.97 26.62 1.8594 1 3 3 49.87 11.69 1.8280 2 3 0 50.63 6.43 1.8024 1 4 2 51.13 5.51 1.7860 2 3 1 54.76 32.96 1.6757 2 3 2 55.34 8.28 1.6594 2 2 3 56.64 13.77 1.6246 1 4 3 57.45 2.40 1.6034 2 4 0 58.45 1.46 1.5785 1 0 5 60.25 10.64 1.5354 2 1 4 60.49 20.14 1.5300 2 3 3 60.90 4.24 1.5207 0 4 4 61.93 1.11 1.4977 2 4 2 62.45 2.85 1.4864 1 2 5 63.42 10.44 1.4662 3 2 0 64.19 5.12 1.4503 0 6 1 64.42 2.66 1.4458 1 4 4 64.49 1.94 1.4443 3 2 1 64.81 4.46 1.4380 3 1 2 65.60 38.22 1.4225 1 5 3 66.35 24.37 1.4082 2 5 0 66.90 23.76 1.3979 0 0 6 67.27 8.65 1.3912 1 3 5 67.28 1.29 1.3909 2 4 3 67.40 3.85 1.3888 2 5 1 68.01 4.98 1.3779 2 3 4 69.11 37.57 1.3585 3 0 3 69.23 1.21 1.3565 3 3 1 69.86 4.49 1.3458 2 1 5 70.64 1.01 1.3328 0 2 6 70.72 5.14 1.3315 1 6 2 72.52 4.26 1.3028 0 6 3 73.93 7.92 1.2815 1 2 6 74.45 2.45 1.2737 2 4 4 75.56 2.07 1.2577 2 5 3 75.63 1.46 1.2568 3 4 1 75.77 6.31 1.2548 1 6 3 76.47 2.59 1.2450 2 6 0 77.10 3.15 1.2364 3 1 4 77.47 1.37 1.2315 2 6 1 78.41 4.48 1.2190 1 3 6 78.47 5.21 1.2183 1 7 0 78.61 1.59 1.2165 3 4 2 79.50 3.20 1.2050 0 6 4 82.46 1.33 1.1691 2 5 4 82.66 2.46 1.1667 1 6 4 82.75 2.38 1.1657 4 0 0 83.50 3.15 1.1571 2 2 6 84.08 5.08 1.1506 1 1 7 84.58 1.51 1.1451 1 4 6 84.60 4.77 1.1449 4 1 1 87.87 1.08 1.1104 2 3 6 88.25 2.06 1.1066 0 6 5 88.52 3.43 1.1040 3 2 5 88.48 2.93 1.1044 0 8 0 88.48 2.93 1.1044 0 8 0 XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.