Pickeringite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern for R070187 Quartieri S, Triscari M, Viani A European Journal of Mineralogy 12 (2000) 1131-1138 Crystal structure of the hydrated sulphate pickeringite (MgAl2(SO4)4.22H2O): X-ray powder diffraction study CELL PARAMETERS: 6.188960 24.27293 21.25563 90.00000 100.2798 90.00000 SPACE GROUP: P2_1/c X-RAY WAVELENGTH: 1.541838 2-THETA INTENSITY D-SPACING H K L 5.57 3.17 15.8442 0 1 1 8.44 6.90 10.4572 0 0 2 9.19 34.69 9.6039 0 1 2 11.15 15.20 7.9221 0 2 2 13.20 1.37 6.7006 0 1 3 14.63 43.25 6.0451 0 2 3 15.18 5.39 5.8279 0 4 1 15.46 3.05 5.7254 -1 0 2 15.88 1.99 5.5725 -1 1 2 16.14 3.83 5.4850 -1 2 1 16.77 16.02 5.2814 0 3 3 16.87 2.80 5.2485 0 4 2 17.10 1.92 5.1781 -1 2 2 17.46 1.40 5.0739 1 2 1 17.90 54.51 4.9488 -1 1 3 18.10 15.59 4.8955 -1 3 1 18.10 1.58 4.8961 1 0 2 18.21 17.75 4.8655 1 3 0 18.45 100.00 4.8019 0 2 4 18.74 1.97 4.7289 0 5 1 19.00 17.29 4.6664 -1 2 3 19.29 33.72 4.5965 1 3 1 19.53 2.94 4.5405 1 2 2 20.14 6.45 4.4032 0 5 2 20.20 1.04 4.3914 0 3 4 20.29 15.68 4.3712 -1 0 4 20.54 17.20 4.3191 -1 4 1 20.64 58.70 4.2984 1 4 0 20.69 4.31 4.2871 -1 3 3 21.19 7.78 4.1889 1 3 2 21.31 26.54 4.1644 -1 4 2 21.31 9.39 4.1650 1 1 3 21.53 3.44 4.1221 0 1 5 21.58 22.57 4.1126 -1 2 4 21.60 29.46 4.1096 1 4 1 22.24 18.02 3.9924 1 2 3 22.36 2.39 3.9719 0 6 1 22.42 3.60 3.9610 0 4 4 22.46 26.79 3.9546 0 2 5 22.87 6.24 3.8839 -1 4 3 23.32 5.79 3.8102 -1 5 1 23.41 9.48 3.7960 1 5 0 23.55 32.31 3.7730 0 6 2 23.72 2.31 3.7470 1 3 3 23.92 5.79 3.7157 0 3 5 24.26 11.51 3.6640 1 5 1 24.31 2.20 3.6575 1 0 4 24.59 8.16 3.6166 1 1 4 24.66 1.27 3.6061 -1 2 5 25.08 1.22 3.5468 -1 4 4 25.41 1.09 3.5014 -1 5 3 25.43 91.09 3.4990 0 6 3 25.41 50.40 3.5019 1 2 4 25.53 3.25 3.4857 0 0 6 25.79 11.58 3.4503 0 1 6 25.82 3.52 3.4473 1 5 2 26.01 1.80 3.4222 -1 3 5 26.58 4.18 3.3503 0 2 6 26.72 23.61 3.3328 1 3 4 26.96 2.46 3.3039 -1 6 2 27.06 4.10 3.2913 0 7 2 27.08 3.74 3.2888 -1 0 6 27.19 11.27 3.2764 1 6 1 27.34 6.35 3.2590 -1 1 6 27.43 1.71 3.2484 -1 5 4 27.79 5.05 3.2064 -1 4 5 27.96 4.65 3.1882 1 5 3 28.08 15.02 3.1743 -1 2 6 28.22 9.81 3.1585 -1 6 3 28.46 1.86 3.1325 1 4 4 28.59 1.75 3.1186 1 6 2 28.72 3.55 3.1047 0 7 3 28.89 2.74 3.0872 1 2 5 29.01 6.94 3.0744 -2 0 2 29.08 4.78 3.0680 -2 1 1 29.28 12.49 3.0467 -1 3 6 29.30 1.34 3.0448 2 0 0 29.41 1.32 3.0341 0 8 0 29.52 3.71 3.0226 0 4 6 29.54 6.66 3.0211 2 1 0 29.78 2.48 2.9970 -2 2 1 30.05 10.35 2.9706 -2 1 3 30.07 7.04 2.9691 -1 6 4 30.10 3.28 2.9654 0 1 7 30.23 1.17 2.9533 2 2 0 30.31 1.37 2.9460 1 7 1 30.55 2.09 2.9229 1 6 3 30.73 5.35 2.9060 -2 2 3 30.79 1.61 2.9012 0 2 7 30.89 21.29 2.8914 -1 4 6 30.91 4.74 2.8898 0 7 4 31.09 8.86 2.8739 -2 3 2 31.21 2.38 2.8627 -2 0 4 31.25 2.65 2.8595 -1 7 3 31.28 5.11 2.8566 2 2 1 31.43 18.40 2.8430 -2 1 4 31.57 9.19 2.8314 0 5 6 31.58 7.03 2.8298 1 7 2 31.64 2.20 2.8252 1 4 5 31.74 3.83 2.8163 1 0 6 31.96 3.46 2.7975 1 1 6 32.01 1.22 2.7927 2 0 2 32.09 6.30 2.7862 -2 2 4 32.14 6.67 2.7821 0 8 3 32.23 7.25 2.7744 2 1 2 32.37 8.84 2.7626 2 3 1 32.40 6.03 2.7607 -1 6 5 32.62 3.59 2.7425 -2 4 2 32.61 2.55 2.7434 1 2 6 32.83 1.79 2.7252 -1 3 7 32.86 2.05 2.7228 -1 5 6 32.88 3.65 2.7209 -1 8 1 32.88 3.53 2.7216 2 2 2 32.94 7.26 2.7166 -1 7 4 33.16 6.44 2.6988 -2 3 4 33.34 4.69 2.6843 -2 4 3 33.39 28.15 2.6809 -1 8 2 33.39 1.03 2.6805 0 4 7 33.47 1.32 2.6748 0 9 1 33.58 5.13 2.6661 1 8 1 33.91 2.02 2.6407 0 6 6 33.92 1.22 2.6399 2 3 2 34.13 1.61 2.6243 0 8 4 34.30 3.60 2.6115 0 9 2 34.29 5.04 2.6124 -1 4 7 34.34 11.63 2.6086 2 1 3 34.75 5.01 2.5790 1 8 2 34.74 9.09 2.5794 2 5 0 34.95 9.15 2.5646 2 2 3 34.98 7.39 2.5627 -2 3 5 35.10 1.65 2.5542 -1 7 5 35.08 1.47 2.5557 0 2 8 35.09 10.10 2.5546 1 4 6 35.13 4.34 2.5519 -1 6 6 35.19 6.71 2.5478 -2 5 3 35.61 2.38 2.5186 -1 2 8 35.64 4.40 2.5164 1 7 4 35.68 8.93 2.5139 -2 1 6 35.95 1.83 2.4959 2 3 3 36.34 7.36 2.4698 -1 9 1 36.51 3.62 2.4583 0 7 6 36.67 2.67 2.4481 2 0 4 36.80 6.42 2.4398 -1 9 2 36.87 1.12 2.4357 2 1 4 36.91 2.50 2.4328 2 6 0 37.00 1.60 2.4273 0 10 0 37.23 3.26 2.4125 -2 3 6 37.42 7.07 2.4010 0 4 8 37.48 1.29 2.3969 0 9 4 37.66 7.26 2.3862 -1 7 6 37.77 2.52 2.3795 -1 9 3 37.92 1.28 2.3701 -1 4 8 38.40 4.96 2.3418 -2 1 7 38.49 1.45 2.3368 -2 6 4 38.55 1.39 2.3332 -2 4 6 38.77 6.33 2.3202 1 4 7 38.98 1.03 2.3081 -2 7 1 39.08 4.27 2.3025 -1 1 9 39.10 4.11 2.3018 0 5 8 39.16 4.47 2.2983 2 6 2 39.26 1.34 2.2923 0 10 3 39.33 5.17 2.2886 0 8 6 39.34 3.06 2.2880 2 7 0 39.44 11.56 2.2824 0 2 9 39.60 4.35 2.2737 1 9 3 39.63 3.21 2.2721 -1 2 9 39.74 2.64 2.2661 2 1 5 39.86 1.18 2.2592 -2 3 7 39.94 1.96 2.2548 1 10 0 40.02 7.02 2.2508 1 1 8 40.09 1.46 2.2468 -2 6 5 40.32 4.78 2.2348 -1 10 2 40.34 3.47 2.2335 0 3 9 40.41 1.30 2.2301 -1 8 6 40.52 2.17 2.2239 -1 3 9 41.00 1.29 2.1992 1 8 5 41.08 2.21 2.1948 -1 9 5 41.11 3.88 2.1936 -2 4 7 41.16 1.08 2.1910 2 3 5 41.26 2.01 2.1859 2 5 4 41.48 1.59 2.1747 1 10 2 41.56 1.74 2.1707 1 9 4 41.75 3.68 2.1613 -1 4 9 41.80 1.02 2.1591 0 11 2 42.37 1.01 2.1312 -2 7 5 42.42 2.14 2.1289 0 8 7 42.56 2.60 2.1221 -1 10 4 42.95 2.20 2.1038 0 11 3 43.04 1.62 2.0994 0 10 5 43.15 1.75 2.0943 -1 8 7 43.15 3.24 2.0944 2 6 4 43.20 1.04 2.0923 2 7 3 43.38 4.59 2.0837 0 1 10 43.53 1.56 2.0769 -1 11 1 43.58 1.23 2.0746 1 11 0 43.93 2.92 2.0590 -1 11 2 43.88 1.22 2.0611 0 2 10 43.99 1.47 2.0563 -2 4 8 44.03 1.27 2.0548 2 8 2 44.08 2.03 2.0523 1 11 1 44.15 3.35 2.0492 1 5 8 44.24 4.21 2.0452 2 3 6 44.24 3.74 2.0452 1 1 9 44.74 2.53 2.0238 1 2 9 44.98 11.38 2.0133 0 12 1 44.94 4.52 2.0150 0 6 9 45.02 2.26 2.0118 1 11 2 45.11 1.32 2.0079 -1 6 9 45.21 2.26 2.0036 -2 9 3 45.39 1.70 1.9962 2 4 6 45.49 1.62 1.9919 0 10 6 45.95 7.94 1.9731 -1 9 7 46.03 3.24 1.9699 -1 11 4 46.06 1.04 1.9689 3 3 0 46.20 7.15 1.9631 -1 8 8 46.26 1.12 1.9605 3 2 1 46.37 3.35 1.9562 1 11 3 46.48 4.98 1.9517 0 11 5 46.61 1.17 1.9469 -2 7 7 46.60 2.09 1.9472 -3 4 1 46.68 2.77 1.9440 -3 2 5 46.92 2.05 1.9344 1 8 7 47.21 1.28 1.9232 3 1 2 47.31 1.33 1.9196 1 12 0 47.47 1.02 1.9136 -3 3 5 47.60 1.30 1.9085 -3 0 6 47.59 2.36 1.9090 2 3 7 47.68 1.57 1.9054 3 2 2 47.87 2.71 1.8985 -3 5 2 47.95 1.65 1.8955 0 1 11 48.01 9.83 1.8932 -3 5 1 48.14 2.24 1.8882 -3 5 3 48.14 1.23 1.8884 -2 0 10 48.42 1.18 1.8780 -1 12 3 48.45 2.27 1.8771 0 9 8 48.46 22.07 1.8767 3 3 2 48.56 5.93 1.8731 -2 5 9 48.58 3.06 1.8722 1 1 10 48.83 2.37 1.8631 -3 5 4 48.86 2.50 1.8623 -1 9 8 48.93 3.60 1.8598 0 13 1 48.89 2.57 1.8613 -1 6 10 48.94 1.52 1.8593 -2 8 7 49.04 1.24 1.8557 1 2 10 49.35 2.60 1.8449 0 8 9 49.48 1.44 1.8403 3 2 3 49.61 4.02 1.8357 -1 12 4 49.71 3.29 1.8324 -1 11 6 49.70 2.99 1.8328 -3 6 1 49.80 2.92 1.8292 1 3 10 50.04 3.76 1.8210 0 12 5 50.23 1.17 1.8146 -2 6 9 50.24 3.13 1.8144 3 3 3 50.24 1.03 1.8143 0 4 11 50.29 1.94 1.8127 2 9 4 50.50 1.26 1.8056 -2 10 5 50.57 3.41 1.8031 -2 4 10 51.07 2.36 1.7866 -1 13 1 51.16 4.40 1.7837 2 3 8 51.24 4.71 1.7812 -1 5 11 51.48 1.38 1.7734 -2 8 8 51.56 2.20 1.7708 1 13 1 51.63 2.30 1.7686 3 2 4 51.76 1.73 1.7644 -3 7 3 51.89 1.61 1.7605 0 9 9 52.04 6.23 1.7557 -1 9 9 52.20 1.01 1.7507 -2 10 6 52.40 1.02 1.7446 1 13 2 52.38 1.25 1.7452 1 10 7 52.50 1.74 1.7414 3 6 2 52.60 1.25 1.7384 0 1 12 52.75 1.42 1.7338 0 14 0 52.73 1.69 1.7344 2 8 6 52.83 1.15 1.7314 2 11 2 52.85 2.54 1.7307 -1 6 11 52.94 1.72 1.7279 0 14 1 53.19 1.80 1.7205 -1 3 12 53.45 7.10 1.7125 -3 7 5 53.49 3.02 1.7113 2 5 8 53.68 1.15 1.7058 -3 8 2 53.95 1.09 1.6980 -2 9 8 54.13 1.66 1.6928 -2 12 1 54.12 1.21 1.6929 -3 4 8 54.19 2.01 1.6910 -1 4 12 54.24 1.07 1.6896 2 2 9 54.71 1.39 1.6762 -1 7 11 54.77 1.39 1.6745 -1 10 9 54.81 1.05 1.6733 3 3 5 54.86 8.84 1.6720 -3 7 6 55.21 4.66 1.6623 -2 11 6 55.61 1.28 1.6512 1 7 10 55.79 1.57 1.6461 3 4 5 56.06 1.44 1.6390 2 11 4 56.21 1.04 1.6351 -3 9 1 56.27 1.19 1.6333 1 9 9 56.33 1.13 1.6318 -3 9 3 56.46 5.96 1.6284 3 1 6 56.99 3.01 1.6145 -1 6 12 57.10 2.74 1.6115 -2 3 12 57.28 1.71 1.6070 -3 0 10 57.52 1.39 1.6006 0 6 12 57.62 1.11 1.5982 1 1 12 57.92 1.21 1.5906 -1 12 8 58.03 1.92 1.5879 1 2 12 58.43 1.40 1.5779 0 3 13 58.52 1.58 1.5757 -1 14 5 58.71 1.79 1.5712 1 3 12 58.80 1.02 1.5690 -1 13 7 58.76 2.30 1.5700 -1 7 12 59.38 1.24 1.5551 0 4 13 59.45 1.21 1.5534 -3 4 10 59.42 1.04 1.5540 0 9 11 59.51 1.56 1.5518 3 1 7 60.17 1.26 1.5365 1 15 2 60.22 1.02 1.5353 -4 1 1 60.48 1.01 1.5294 -3 10 5 60.77 5.01 1.5226 -1 12 9 61.00 1.89 1.5175 -1 15 4 61.19 3.24 1.5133 -2 3 13 61.25 1.90 1.5118 -1 1 14 62.37 2.52 1.4874 -1 15 5 63.09 1.94 1.4722 2 3 11 63.22 2.30 1.4695 3 2 8 63.65 1.10 1.4606 2 10 8 63.88 1.19 1.4559 -4 2 7 64.03 1.27 1.4528 -1 13 9 63.99 1.59 1.4536 2 4 11 64.57 1.15 1.4419 2 9 9 65.17 1.04 1.4301 1 11 10 65.88 1.29 1.4164 1 8 12 66.29 1.83 1.4087 -2 15 4 66.56 1.08 1.4036 -4 6 6 66.79 1.51 1.3994 2 13 6 67.40 1.10 1.3882 -2 15 5 67.55 1.42 1.3854 -1 17 2 67.93 1.69 1.3787 -4 6 7 68.17 1.03 1.3743 -2 13 9 68.21 1.31 1.3736 -2 8 13 68.29 1.18 1.3723 -4 3 9 68.35 1.07 1.3712 -4 8 4 68.93 1.03 1.3610 -2 1 15 68.98 1.16 1.3602 1 15 7 69.15 1.13 1.3572 -4 4 9 69.65 1.02 1.3488 -4 1 10 70.14 2.11 1.3405 -2 16 4 70.32 1.30 1.3374 0 18 2 71.24 1.04 1.3224 4 4 5 71.50 1.20 1.3183 1 6 14 71.87 1.20 1.3124 -2 5 15 72.09 1.48 1.3090 2 9 11 72.26 1.22 1.3063 3 14 1 72.85 1.34 1.2972 4 8 3 73.42 1.28 1.2885 -4 10 5 74.40 1.52 1.2739 -4 10 6 75.27 1.06 1.2613 -3 14 7 75.56 1.15 1.2572 -3 1 15 75.67 1.42 1.2557 1 12 12 76.22 1.15 1.2479 4 6 6 76.39 2.14 1.2456 1 6 15 77.59 1.22 1.2294 3 11 8 77.63 1.06 1.2288 3 13 6 78.45 1.28 1.2180 2 10 12 82.27 1.52 1.1709 -4 2 14 83.42 1.27 1.1576 3 14 7 83.42 1.27 1.1576 3 14 7 XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.