Chapmanite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern Ballirano P, Maras A, Marchetti F, Merlino S, Perchiazzi N Powder Diffraction 13 (1998) 44-49 Rietveld refinement of chapmanite SbFe2Si2O8OH, a TO dioctahderal kaolinite-like mineral Locality: Tafone mine, Tucsany, Italy CELL PARAMETERS: 5.211201 8.993146 7.769889 90.00000 101.6500 90.00000 SPACE GROUP: Cm X-RAY WAVELENGTH: 1.541838 2-THETA INTENSITY D-SPACING H K L 11.61 82.24 7.6098 0 0 1 19.98 3.60 4.4388 1 1 0 21.31 31.82 4.1658 -1 1 1 22.95 72.82 3.8713 0 2 1 23.35 8.75 3.8049 0 0 2 24.91 100.00 3.5710 1 1 1 28.05 79.62 3.1777 -1 1 2 30.75 49.18 2.9046 0 2 2 33.57 21.29 2.6667 1 1 2 34.71 23.45 2.5818 -2 0 1 34.67 46.80 2.5848 1 3 0 35.13 7.72 2.5519 2 0 0 35.35 17.97 2.5366 0 0 3 35.48 13.79 2.5275 -1 3 1 37.59 8.07 2.3906 -1 1 3 37.85 16.10 2.3747 1 3 1 38.26 7.74 2.3503 -2 0 2 39.41 2.52 2.2844 2 0 1 40.08 4.79 2.2476 -1 3 2 40.07 2.17 2.2483 0 4 0 40.24 5.83 2.2390 -2 2 1 40.61 7.78 2.2194 2 2 0 40.80 5.65 2.2093 0 2 3 41.86 10.92 2.1562 0 4 1 43.40 11.08 2.0829 -2 2 2 44.08 3.61 2.0525 1 1 3 44.29 5.01 2.0432 1 3 2 44.44 9.34 2.0367 2 2 1 44.97 3.40 2.0138 -2 0 3 46.64 4.72 1.9454 2 0 2 46.89 6.03 1.9356 0 4 2 47.54 9.93 1.9108 -1 3 3 47.76 1.93 1.9025 0 0 4 48.60 2.12 1.8717 -1 1 4 49.55 5.70 1.8379 -2 2 3 51.11 6.44 1.7855 2 2 2 52.16 1.66 1.7521 0 2 4 53.06 16.40 1.7244 1 3 3 53.93 7.47 1.6984 -2 0 4 54.33 1.30 1.6870 2 4 0 54.49 4.62 1.6825 0 4 3 54.58 1.69 1.6799 -1 5 1 54.87 3.91 1.6716 3 1 0 55.43 4.21 1.6562 -3 1 2 55.76 2.21 1.6470 1 1 4 55.99 3.96 1.6410 2 0 3 56.30 6.31 1.6326 1 5 1 56.60 5.63 1.6246 -2 4 2 57.05 7.54 1.6130 -1 3 4 57.46 6.19 1.6024 2 4 1 57.99 2.54 1.5889 -2 2 4 57.97 6.17 1.5895 -1 5 2 58.81 4.34 1.5688 3 1 1 59.86 4.30 1.5436 -3 1 3 59.95 1.57 1.5415 2 2 3 60.71 2.32 1.5242 -1 1 5 60.80 1.22 1.5220 0 0 5 61.24 2.49 1.5121 1 5 2 61.67 13.30 1.5027 -3 3 1 61.79 2.15 1.5001 -2 4 3 61.84 6.58 1.4989 0 6 0 62.74 2.72 1.4796 3 3 0 63.14 1.33 1.4711 2 4 2 63.25 1.86 1.4689 -3 3 2 63.17 2.22 1.4706 0 6 1 63.56 4.32 1.4625 1 3 4 63.88 1.18 1.4560 -1 5 3 64.06 1.35 1.4523 0 4 4 64.60 1.90 1.4415 -2 0 5 64.59 1.92 1.4416 0 2 5 65.20 1.06 1.4296 3 1 2 66.97 3.30 1.3961 2 0 4 68.17 5.74 1.3744 -1 3 5 68.27 1.38 1.3726 -2 2 5 68.54 1.49 1.3679 1 1 5 70.57 1.06 1.3333 2 2 4 72.42 1.79 1.3038 3 3 2 72.54 1.94 1.3020 -4 0 1 72.91 3.63 1.2962 -2 6 1 73.16 1.37 1.2924 2 6 0 73.29 1.68 1.2904 0 6 3 73.84 1.61 1.2822 -3 3 4 73.97 1.29 1.2803 -1 1 6 77.56 1.03 1.2297 -3 5 2 77.73 1.53 1.2275 4 2 0 78.25 1.20 1.2207 0 2 6 78.30 1.38 1.2200 1 7 1 79.85 1.41 1.2001 -4 2 3 79.73 1.40 1.2017 -1 7 2 80.46 1.11 1.1926 3 5 1 81.38 1.12 1.1814 -3 5 3 84.81 1.27 1.1422 4 0 2 86.53 2.30 1.1238 -2 6 4 88.21 1.46 1.1067 2 6 3 88.21 1.46 1.1067 2 6 3 XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.