Topaz Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern for R060024 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 20.12 3.97 4.4158 0 2 0 21.19 1.95 4.1939 0 0 2 21.56 8.83 4.1228 1 1 0 22.77 4.70 3.9074 0 2 1 24.06 74.81 3.7000 1 1 1 27.83 86.00 3.2059 1 2 0 29.37 39.61 3.0410 0 2 2 29.84 20.63 2.9947 1 2 1 30.40 100.00 2.9401 1 1 2 36.08 23.22 2.4891 1 3 0 37.50 8.23 2.3978 1 0 3 37.69 17.27 2.3863 1 3 1 38.09 49.10 2.3623 0 2 3 38.91 8.01 2.3140 1 1 3 40.00 3.41 2.2538 2 1 0 40.86 9.67 2.2079 0 4 0 41.48 13.25 2.1766 2 1 1 42.32 4.53 2.1352 0 4 1 42.91 55.18 2.1072 1 2 3 43.13 1.38 2.0970 0 0 4 43.91 29.23 2.0614 2 2 0 45.44 7.30 1.9954 1 4 0 45.69 2.11 1.9853 2 1 2 46.47 1.54 1.9537 0 4 2 46.78 4.58 1.9413 1 4 1 48.70 24.63 1.8691 1 1 4 48.98 26.62 1.8591 1 3 3 49.89 11.69 1.8275 2 3 0 50.64 6.43 1.8019 1 4 2 51.14 5.51 1.7856 2 3 1 54.77 32.96 1.6753 2 3 2 55.35 8.28 1.6592 2 2 3 56.65 13.77 1.6242 1 4 3 57.47 2.40 1.6030 2 4 0 58.44 1.46 1.5785 1 0 5 60.26 10.64 1.5352 2 1 4 60.50 20.14 1.5297 2 3 3 60.90 4.24 1.5205 0 4 4 61.95 1.11 1.4973 2 4 2 62.45 2.85 1.4864 1 2 5 63.43 10.44 1.4659 3 2 0 64.21 5.12 1.4498 0 6 1 64.43 2.66 1.4455 1 4 4 64.50 1.94 1.4440 3 2 1 64.82 4.46 1.4377 3 1 2 65.62 38.22 1.4221 1 5 3 66.37 24.37 1.4078 2 5 0 66.90 23.76 1.3980 0 0 6 67.27 8.65 1.3911 1 3 5 67.30 1.29 1.3906 2 4 3 67.42 3.85 1.3884 2 5 1 68.01 4.98 1.3777 2 3 4 69.12 37.57 1.3583 3 0 3 69.25 1.21 1.3562 3 3 1 69.86 4.49 1.3457 2 1 5 70.64 1.01 1.3328 0 2 6 70.74 5.14 1.3311 1 6 2 72.54 4.26 1.3025 0 6 3 73.92 7.92 1.2814 1 2 6 74.46 2.45 1.2735 2 4 4 75.58 2.07 1.2574 2 5 3 75.65 1.46 1.2564 3 4 1 75.79 6.31 1.2544 1 6 3 76.50 2.59 1.2446 2 6 0 77.11 3.15 1.2362 3 1 4 77.49 1.37 1.2311 2 6 1 78.42 4.48 1.2189 1 3 6 78.49 5.21 1.2179 1 7 0 78.62 1.59 1.2162 3 4 2 79.52 3.20 1.2048 0 6 4 82.48 1.33 1.1688 2 5 4 82.68 2.46 1.1664 1 6 4 82.77 2.38 1.1655 4 0 0 83.51 3.15 1.1570 2 2 6 84.07 5.08 1.1507 1 1 7 84.59 1.51 1.1450 1 4 6 84.62 4.77 1.1447 4 1 1 87.88 1.08 1.1103 2 3 6 88.27 2.06 1.1064 0 6 5 88.53 3.43 1.1038 3 2 5 88.52 2.93 1.1040 0 8 0 88.52 2.93 1.1040 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.