Poldervaartite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern of R050177 Dai Y S, Harlow G E, McGhie A R American Mineralogist 78 (1993) 1082-1087 Poldervaartite, Ca(Ca0.5Mn0.5)(SiO3OH)(OH), a new acid nesosilicate from the Kalahari manganese field, South Africa: Crystal structure and description CELL PARAMETERS: 9.239545 9.052576 10.36057 90.00000 90.00000 90.00000 SPACE GROUP: Pbca X-RAY WAVELENGTH: 1.541838 2-THETA INTENSITY D-SPACING H K L 16.16 1.44 5.4855 1 1 1 17.12 13.03 5.1803 0 0 2 19.65 2.56 4.5185 1 0 2 19.61 1.81 4.5263 0 2 0 21.42 20.47 4.1477 0 2 1 21.59 23.00 4.1149 2 1 0 21.98 5.84 4.0429 1 1 2 23.25 17.70 3.8243 2 1 1 23.51 2.87 3.7840 1 2 1 25.83 24.27 3.4479 2 0 2 26.14 2.47 3.4085 0 2 2 27.58 9.36 3.2331 2 2 0 27.68 10.35 3.2221 2 1 2 27.89 100.00 3.1978 1 2 2 28.92 1.03 3.0863 2 2 1 29.31 2.00 3.0463 1 1 3 31.87 31.83 2.8067 3 1 1 32.37 21.50 2.7644 1 3 1 32.60 9.67 2.7456 0 2 3 32.64 3.56 2.7428 2 2 2 33.85 10.16 2.6473 3 0 2 33.87 1.81 2.6453 2 1 3 34.05 11.38 2.6319 1 2 3 34.62 19.73 2.5901 0 0 4 35.31 29.98 2.5409 3 1 2 35.52 18.36 2.5264 2 3 0 35.77 1.16 2.5094 1 3 2 36.00 2.56 2.4940 1 0 4 36.32 20.22 2.4727 3 2 1 36.60 4.20 2.4544 2 3 1 37.38 6.29 2.4044 1 1 4 38.11 49.74 2.3602 2 2 3 39.41 3.75 2.2852 3 2 2 39.67 5.38 2.2707 2 3 2 39.88 1.84 2.2593 2 0 4 40.09 6.41 2.2481 0 2 4 40.47 1.15 2.2279 3 1 3 40.79 1.45 2.2110 0 4 1 41.25 6.71 2.1877 4 1 1 41.31 2.48 2.1844 1 2 4 42.85 6.91 2.1097 4 0 2 42.83 1.51 2.1102 3 3 1 43.62 2.93 2.0739 0 4 2 43.99 6.70 2.0575 4 2 0 44.41 9.49 2.0390 2 3 3 44.56 3.41 2.0324 2 4 0 44.89 2.55 2.0180 4 2 1 44.76 13.73 2.0235 1 4 2 45.56 2.28 1.9900 3 3 2 45.46 2.10 1.9944 2 4 1 45.75 1.27 1.9823 3 0 4 46.89 3.12 1.9364 3 1 4 47.26 1.68 1.9224 1 3 4 47.53 9.08 1.9122 4 2 2 48.04 8.96 1.8929 0 4 3 48.06 2.60 1.8920 2 4 2 48.44 4.34 1.8782 4 1 3 49.10 1.28 1.8544 1 4 3 49.34 2.56 1.8461 1 2 5 49.68 2.17 1.8342 4 3 0 50.22 1.87 1.8158 3 2 4 50.43 1.60 1.8085 2 3 4 50.51 5.46 1.8061 4 3 1 51.69 1.92 1.7676 4 2 3 52.19 10.72 1.7516 2 4 3 52.42 14.43 1.7446 2 2 5 52.55 6.16 1.7405 5 0 2 53.00 3.67 1.7268 0 0 6 53.09 1.30 1.7239 4 0 4 53.59 1.14 1.7092 5 1 2 53.99 2.57 1.6974 1 0 6 53.76 2.94 1.7042 0 4 4 54.13 2.20 1.6935 4 1 4 54.28 8.36 1.6890 3 1 5 54.61 6.63 1.6797 1 3 5 54.57 5.60 1.6806 1 5 2 54.74 2.80 1.6760 1 4 4 55.01 3.18 1.6683 1 1 6 55.43 2.26 1.6568 3 3 4 56.62 6.94 1.6245 5 2 2 56.89 3.97 1.6175 2 0 6 56.80 2.51 1.6199 4 3 3 56.93 10.85 1.6166 4 4 0 57.14 4.65 1.6110 4 2 4 57.29 2.18 1.6072 3 2 5 57.49 2.19 1.6021 2 3 5 57.62 1.32 1.5989 2 4 4 57.88 1.06 1.5923 2 1 6 58.00 5.50 1.5893 1 2 6 58.37 4.25 1.5799 1 5 3 59.28 5.90 1.5580 5 3 1 60.04 2.76 1.5399 6 0 0 59.89 11.59 1.5434 3 5 1 60.77 2.93 1.5231 2 2 6 61.14 1.74 1.5149 2 5 3 61.46 2.82 1.5077 5 3 2 61.62 6.31 1.5043 5 0 4 61.41 3.36 1.5088 0 6 0 62.56 5.90 1.4840 5 1 4 63.70 1.78 1.4600 4 2 5 63.45 1.87 1.4652 1 5 4 64.15 4.26 1.4510 2 4 5 64.51 3.19 1.4436 6 2 1 64.26 3.11 1.4486 0 6 2 64.98 1.24 1.4342 2 6 0 65.14 1.57 1.4311 1 6 2 65.60 4.36 1.4223 3 5 3 66.15 1.11 1.4117 4 5 1 67.17 1.20 1.3927 2 1 7 68.36 2.21 1.3714 4 4 4 70.01 2.60 1.3431 6 2 3 70.38 1.77 1.3368 3 5 4 71.19 1.98 1.3237 6 0 4 71.25 3.73 1.3227 4 2 6 71.71 1.24 1.3153 1 3 7 73.84 1.72 1.2825 1 0 8 74.04 1.34 1.2796 3 2 7 74.38 1.71 1.2746 4 4 5 74.70 1.25 1.2699 1 1 8 75.13 1.18 1.2636 6 4 1 75.54 1.42 1.2578 7 2 1 76.45 1.90 1.2451 0 2 8 77.50 1.87 1.2309 7 2 2 77.08 1.18 1.2365 2 7 1 78.19 1.12 1.2217 7 1 3 78.68 2.16 1.2153 5 2 6 79.79 3.72 1.2011 7 3 1 81.51 1.23 1.1801 4 4 6 82.69 2.45 1.1662 7 1 4 82.24 1.77 1.1715 2 7 3 83.06 1.76 1.1620 3 7 2 84.79 1.55 1.1426 6 4 4 85.03 3.32 1.1400 5 6 2 85.65 1.51 1.1333 7 4 1 85.39 2.50 1.1362 0 6 6 86.00 2.09 1.1296 4 0 8 86.53 1.96 1.1240 0 4 8 86.75 1.28 1.1218 4 7 1 87.33 1.83 1.1158 1 4 8 87.68 2.22 1.1122 2 5 7 88.71 1.24 1.1020 5 4 6 90.22 2.07 1.0874 8 1 3 89.64 1.19 1.0929 2 8 1 91.13 2.31 1.0789 5 3 7 91.13 2.31 1.0789 5 3 7 XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.