Dravite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern Foit F F, Rosenberg P E American Mineralogist 64 (1979) 788-798 The structure of vanadium-bearing tourmaline and its implications regarding tourmaline solid solutions CELL PARAMETERS: 15.91651 15.91651 7.187071 90.00000 90.00000 120.0000 SPACE GROUP: R3m X-RAY WAVELENGTH: 1.541838 2-THETA INTENSITY D-SPACING H K L 13.89 26.25 6.3728 1 0 1 17.82 19.38 4.9744 0 2 1 19.31 19.65 4.5947 3 0 0 21.05 51.23 4.2182 2 1 1 22.33 63.36 3.9791 2 2 0 25.60 47.24 3.4773 0 1 2 26.39 9.15 3.3752 1 3 1 27.99 1.13 3.1864 2 0 2 28.71 1.98 3.1073 4 0 1 29.68 12.22 3.0079 4 1 0 30.19 68.22 2.9581 1 2 2 30.87 8.54 2.8945 3 2 1 34.22 6.57 2.6184 3 1 2 34.83 100.00 2.5740 0 5 1 36.09 1.94 2.4872 0 4 2 36.67 3.87 2.4490 2 4 1 37.52 7.70 2.3957 0 0 3 37.87 13.38 2.3740 2 3 2 38.43 16.60 2.3407 5 1 1 39.19 2.90 2.2973 6 0 0 40.86 1.14 2.2072 5 2 0 41.25 11.52 2.1873 5 0 2 41.77 11.58 2.1612 4 3 1 42.53 5.03 2.1243 0 3 3 42.53 6.47 2.1243 3 0 3 42.85 6.00 2.1091 4 2 2 44.09 12.84 2.0524 2 2 3 44.41 40.65 2.0387 1 5 2 44.90 8.12 2.0175 1 6 1 45.56 3.74 1.9896 4 4 0 47.40 29.57 1.9168 3 4 2 47.86 1.73 1.8992 3 5 1 48.55 5.81 1.8740 1 4 3 49.30 7.16 1.8473 6 2 1 50.25 1.40 1.8144 6 1 2 51.24 1.63 1.7817 1 0 4 51.35 4.63 1.7780 3 3 3 52.60 2.17 1.7387 0 2 4 54.32 3.39 1.6876 2 6 2 55.37 15.11 1.6581 0 6 3 55.37 4.96 1.6581 6 0 3 56.05 13.68 1.6396 2 7 1 57.89 17.86 1.5917 5 5 0 57.83 3.27 1.5932 4 0 4 58.20 3.91 1.5841 4 5 2 58.60 2.16 1.5741 8 1 1 59.09 2.05 1.5622 3 2 4 59.85 3.73 1.5442 4 6 1 60.40 4.50 1.5316 9 0 0 60.69 5.56 1.5249 7 2 2 61.08 1.43 1.5159 7 3 1 61.62 3.70 1.5040 8 2 0 61.56 15.61 1.5053 0 5 4 62.78 3.88 1.4791 2 4 4 63.12 1.49 1.4718 1 8 2 63.98 15.87 1.4542 5 1 4 64.08 3.85 1.4521 1 7 3 64.08 1.14 1.4521 7 1 3 64.32 4.93 1.4472 6 4 2 65.23 5.33 1.4293 7 4 0 65.21 3.99 1.4297 0 1 5 65.89 6.53 1.4166 6 5 1 65.89 1.63 1.4166 1 9 1 66.35 10.60 1.4079 4 3 4 66.44 1.47 1.4061 3 6 3 66.44 4.25 1.4061 6 3 3 68.22 1.38 1.3738 3 8 1 69.37 10.25 1.3537 10 0 1 70.15 3.09 1.3406 5 6 2 71.01 4.17 1.3264 6 6 0 70.96 3.19 1.3273 3 5 4 71.05 4.04 1.3257 5 5 3 71.00 2.93 1.3266 0 4 5 72.14 10.62 1.3083 10 1 0 72.09 1.36 1.3092 6 2 4 72.13 1.95 1.3086 2 3 5 72.41 2.82 1.3041 8 3 2 72.77 1.44 1.2985 5 7 1 73.54 1.51 1.2870 0 10 2 73.89 1.59 1.2816 8 4 1 74.39 3.82 1.2743 9 3 0 74.43 2.58 1.2738 2 8 3 74.37 11.15 1.2746 5 0 5 75.44 2.93 1.2591 5 4 4 76.87 1.03 1.2393 7 5 2 77.22 3.82 1.2345 0 11 1 77.97 1.98 1.2245 4 8 2 78.32 1.33 1.2199 2 10 1 78.79 1.86 1.2138 3 4 5 80.05 1.75 1.1978 0 0 6 80.97 1.35 1.1865 6 1 5 81.59 3.26 1.1790 11 1 1 83.30 1.27 1.1591 3 0 6 84.27 5.45 1.1483 10 1 3 86.42 2.12 1.1251 9 3 3 89.56 2.24 1.0937 10 0 4 89.76 1.33 1.0917 3 3 6 89.76 1.33 1.0917 3 3 6 XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.